That makes the most sense to me. The 2nd radiator is getting the hotter air but that is still enough to cool the initial hot coolant and then the coldest radiator is the last place it goes before the engine.
Yes, this is the laws of thermodynamics. the delta T, keep the hot with the hot, the rear radiator will have the hotter air. Actually the front radiators exit air should NOT be able to go into the rear radiators air. It looks like they have a deflector on the rear but it only goes halfway up, they should make it go all the way to the top of the rear so it gets fresh outside unheated ambient air flow.
You got the radiators backwards. Since you are aiming for maximum cooling, it needs to be counter-flow. The air is flowing from front to back, so the coolant needs to flow from the back to the front. Hot water through the back radiator first will be cooled somewhat, then through the front radiator where air is the coolest, to get the coolant to the lowest temperature possible.
I think he said at the start that when the thermostat is closed it circulates in the back radiator and when the stat opens it adds the front radiator as the primary.
As a diesel mechanic and welder, I appreciate that you have encouraged and helped Lizzie explore her interests! Employers like you are awesome, she will become an incredibly valuable member of the team with the skills you have helped her develop.
Concept of the Day: "Contraflow" When doing heat exchange, the two media should be flowing in opposite directions. So if the air is flowing front to back, then the coolant should be generally progressing back to front, i.e. the front-most radiator visited last, just before sending coolant back to the engine. For clarity, if both circuits of a heat exchanger are plumbed with the same flow direction, then it's a "temperature averager". That said, everything might work just fine. This is just the basic idea of exchanging heat, applied to this example. Cheers.
Should, if you want the heat exchanger to save you fuel/electricity bills .. in heating some building, for example. When you return the otherwise wasted heat to where you are heating by burning fuel/electricity, you save fuel, input power, money... When the heat lost to the air is just wasted (it being implausible to add a heat exchanger to each cylinder and expect it to achieve anything , in a reliable fashion... ) , its only a question of , is their enough heat exchanger power ? Factor into that the diminishing returns of radiators, as the air will also do cooling on the huge surface area of metal of the engine...
That's right, the log mean temperature difference (driving force for heat transfer) is greatest in a counter-flow heat exchanger. In a parallel-flow HX, the large initial temperature difference quickly brings the temperatures closer, reducing the average temperature difference.
Yeppers, lowest temp water should also be in contact with the lowest temp air! Otherwise the waste heat will just be reheating the fluids... Thanx tho, definitely a kool build !!
Engineer here, my primary question after you found the 8.1 was how you were going to cool it. I feel like this episode was for me cheers from Missouri.
Similar lesson learned when I decided to shoot grinding sparks with a DSLR. The sparks bounced right off the plastic body of the camera and lens, but completely pitted the glass element. Running your finger over the element now feels like sandpaper. That was 12-13 yrs ago, but I still have the lens. Sometimes ya gotta keep results of dumb@$$ery around as reminders.
As one of the 7 engineers, I’d like to say: by creating a longer more complicated path for the water you will create resistance to flow. That means that you will have a lower water flow rate with the stock pump. Most likely this will not cause any issues, if however there is an issue when you drive this thing on hot days you may consider changing the impeller on the pump or getting a pump with a higher flow rate.
I was thinking an additional external pump would help with pressure, but not sure about reliability. If they had the radiators in parallel, it’d actually be less back pressure. Really I wouldn’t worry about it unless problems crop up.
@@Dozav7 My old car had an electric auxiliary waterpump. It was still on the original pump (which still worked) when I sold the car, when it was 18 years old.
Absolutely brilliant guys. I was a mechanic, welder and fabricator for 10 years over here in the UK. I had to stop and retrain because my hands stopped working properly. I was also raised in the 4x4 world and still compete in a yellow suzuki as it happens. Wish I could be over there working on your stuff. Keep being awesome 👍💪❤️
Based on my experience with heat exchangers in the process industry, you can get better cooling by running the hot water through the rear radiator first and then through the front radiator.
That's what I was thinking since that's how my condensing furnace works. Run the water first through the rear radiator and then through the front radiator.
It makes sense from the science of it too... the flow of heat is proportional to the diference in temperature (between coolant and the air flowing past it.. ) but that cooling power that might not be needed . If the separate cooling power of two radiators is well above requirements, then the second radiator can run at less cooling power than its design would allow. All these radiators cooling the coolant are raising the temperature of the air flowing past the engine and exhaust, and thats a lot of surface area that gets air cooled.. so there's a diminishing return on improving radiator performance...
Came here to say that exact same thing. Hit the initial water with the cooler that is dealing with hotter air, that will give it a larger gradient to dump heat. Move the then cooler water to the radiator that is working with the coolest air possible to dump off more heat.
Counterflow the radiators. I.E. Feed the rear radiator with water first. You want to maximize the temp difference between the air and the water through the whole system. The higher the temp difference, the better the heat transfer. So in the front coil, the air is the coolest, so it can continue to cool water that is cooler than in the rear radiator. When the air hits the rear radiator, it's hotter, so you want hotter water in the rear radiator to continue transfering heat into the air. Hope this helps! This build is awesome!
Also, the straight through shot through the radiator is not what you do. You should series wire them. If you're going to have a bypass from one to the other you put a thermostat in between like you would on a piece of equipment. I would run a dual thermostat off like a caterpillar system basically a road grader tractor piece of equipment system
If you want to bypass circulate also run your heater core from your motor to your heater core and your heater core to the front radiator. Then run an expansion tank with a small line to it and to the heater core. The air bubbles will go through the expansion tank back to the heater core but you won't have a noticeable amount of float through them
That was cute the excitement lizzy had for wanting to learn how to tig weld. You're wisdom and kindness is being passed on. That what life is about. Amazing man! The man who took time to teach me his wisdom was Charlie Taylor R.I.P.
Lizzie has a lot of enthusiasm on the job, and that is great especially on wanting to learn tig welding, hell, just on learning more about everything……that is a great employee, keep her no matter what she asks for as it will benefit both of you
Kevin Haley , Heck yeah... and considering the crap we see Lizzy getting or the amount of "skip over" she endures daily, you are lucky she is even around.
@@BruceNitroxpro I forgot about most of that, disliked letting her walk out of a place with steep canyons for a wedding I think it was, they could have had this guy take her out on the little quad rather than make her walk out….uncool
Watching and listening to Matt and crew work is mesmerizing. I don't know enough about motors and vehicle inner workings to understand what he is talking about but I sure enjoy hearing their banter with each other and what they all have to say. Thank you.
Lizzy SO excited about welding is awesome. She is just the best. I'd give almost anything to have an employee with her skills, work ethic, and thirst for learning.
Bro is it not so refreshing to see a young woman who is secure in her gender is not all covered in nasty looking Tats and does not have iron hanging off her face. Has a healthy respect for her elders and has killer work ethics. You can tell her parents love her and have taken the time to teach her how to be an excellent human being...You go girl.
Wow! Y’all are killing it! New to the channel. The “can do attitude”, positivity, SKILLS! teamwork, etc…. Thanks for the lessons and hours of useful entertainment. Failed to mention the contribution to community and giving back. America needs more folks like y’all. God Bless! Next time I’m out west hope to stop by and shake your hand. 👍🙏🇺🇸🥓
@@iffykidmn8170 Let’s see. She just turned 20. She competes in rodeos, teaches dancing (line and swing, I believe), plays piano, sings, does roofing, welds, assists in recoveries and has led several recently, and probably does lots more that we don’t even know about. She is extremely talented, has a super personality, has a drive to learn and excel and is a cute as can be. The skills she has all begin with someone teaching and supervising an interested student and she is still learning. What have you accomplished? Lizzy you rock!!!
I have an engine oil cooler on my 3500 dualy. Considering the heavier loads you are going to put on a wrecker, especially in the environments you will be running I would highly recommend it. Its really helped out when pulling heavy loads up some steep grades in high heat.
This has to be one of my favourite channels, everyone’s so friendly you feel like your right there with them. Great way to start the Sunday.. and I lost it when Tom lifted Matt’s fingers off the hot rad 😂
It’s wild how entertaining this channel is. Matt you’re legit funny and the filming is on par. This reminds me of the old automotive TV shows on Spike that were good.
Best channel on YT at the moment by a long shot! Lizzie's excitement to learn to TIG weld , the spinning time travel, huge disappointment thermostat and singing! It's got it all! Great work team!
Specially as they were turning clockwise yesterday and anticlockwise tomorrow. That "thing" is a beast. Looking forward to it's first excursion to the rocks and gullies. Regards from Canada's banana belt. 🤞🇺🇦🕊️🇨🇦🍌👍🦃
Other people may have already pointed this out but since I don't read what other people comment on, here it is and my apologies if I am repeating other people. You are going to have an issue with water flow because the stock pump is not designed for flow requirement through 2x radiators. I was going to look smart and state the formula to calculate flow in a heat energy dissipation circuit but I save you the time, suffice to say that if you are doubling your radiator capacity, you will need to at least double your flow (Gal/min) out of your water pump. You will of course figure it all out in time, being the natural born engineer that you are, Matt but most likely an auxiliary electric pump and a new valve/ control circuit will be needed to modify the flow.
Assuming you have the room under the bonnet, consider finding a way to raise the fill port a few inches so it is above both radiators to aid in filling. You need to have a common high point to properly purge the air.
I was going to say something similar. From my experience in building water cooled computers's back in the day before they made main stream blocks and RadFanCoolerReservoirs for them like they do now-- I toyed around with extra large reservoirs where the pump drew from the cooled water in the res than from the cooled water from the Rad. Although this created a condensation effect on hot days from the Res...the system ran cooler with Res to pump to block to rad than drawing directly from the Rad to Pump to block to Res.
It was shocking to see neither of you have ANY fabrication videos on your channel. yet here you are giving advice to a professional fabricator. Dang that is weird stuff.
Came here to say the same thing. As it is, I'd say he will have a issue with air pockets. I'd recommend adding a steam port from the crossover to the fill port.
@@eriklarson9137 not all experienced builders have to be youtubers so no need for negative feedback on a valid suggestion. Its a common knowledge that the filler or the reservoir has to be higher than the rest of the system since the air gets trapped in the highest point. To me it seemed that the filler was the highest point so it should work just fine. If its not possible to achieve, there is a bleed valve added to the highest point.
It’s refreshing to see all the math, thought and user experience that your team uses to build the custom off road projects. My whole life I have built custom equipment that you can’t buy so it’s nice to see I am not alone. Keep up the patience it takes to teach.
I discovered this channel when y'all went to bring the Golden Nugget off the mountain and been watching ever since. Absolutely love this channel and every one of the "characters" involved. Hey Matt....I really enjoy when you teach what you know and are planning. It makes me feel like I learn something every time. Thanks!
As a mechanic of 20+ years I was wondering 16:21 if this motor already had that. Still a great concept of extra cooling, you can never have too much extra cooling capacity!
These Sunday build videos make me smile. Every time. I watch all your videos, but working in the shop with friends is the best. This one has reminded me to get back on some projects with my friends on my own channel. It was just a fun video. Keep it up Matt and crew!
I really enjoyed how Matt explained the cooling process I always find that kind of stuff very interesting and educational. I really enjoy seeing the building process of the wrecker. The practical joke played on Lizzy at the end was priceless. Keep up the great work everyone
Matt, your coolant path is backwards in terms of cooling efficiency. You want the hottest coolant on the engine side, with the coldest coolant at the front of the truck. This makes a counter-current heat exchanger (air is front-to-back, water is back-to-front) and allows for maximum efficiency of heat transfer.
The front radiator needs a dip tube to ensure flow goes to the bottom half of the radiator. Also, hot fluid to the inner radiator first to improve cooling as others have commented. It is called counter current cooling if anyone wants look it up.
Matt, Please take note of these two comments. You may actually make your cooling worse if you don't fix the fluid instability issue in the front radiator. The way it is set up now the hot water will enter the front radiator, flow through the top portion and flow out the top. The hot water will never reach the bottom of the radiator especially when you are driving and cooling the fluid that is in the bottom half. The cooler/denser fluid in the bottom won't mix with the hotter/thinner fluid in the top. There is a reason the inlets and outlets on radiators are on opposite corners. Also swap the radiator flow. The radiator with the cooler fluid should have the cooler air. Otherwise you could end up with the second radiator fluid and air temps being very close together which would negate any cooling effect.
I had a buddy of mine who use to help me work on my Jeep, like most backyard mechanics he knew wrench sizes and their order. Well he also would come work for me building houses and struggled with reading a tape measure until finally one day it dawned on me to hand him a tape measure and asked him that if I had a 1/2" wrench but it was too small what size wrench you hand me next, he 9/16", yes, but it's still a little small, what size are you handing me now, he said 5/8". I smiled , had him look at the tape and told him, you just learned how to read a tape measure. Never had a problem ever again with reading measurements. Just a little life lesson I had and figured maybe it could help others to grasp reading a tape measure.
Really enjoyed the in depth cooling explanation! I wonder though, would it be better having the flow direction going the other way? IE, hot water goes into the rearmost radiator, then into the front one, so that the coolest air is cooling the already cooled water? I wonder if in the current setup the second radiator .ay have little to no effect due to the cooled water and heated air being to close in temperature to work well?
You are correct, I've replicated this same problem myself when building watercooled PCs. Same concept. You want each radiator to have clean, cool air for maximum cooling power. If they are stacked you are only getting like 20% efficiency out of the extra rads.
It's actually impossible to tell really without some air flow testing. Given that Matt prefers mechanical fans the second radiator will have the most draw through it even if fully boxed in. As there is a split down for the condenser and second radiator to draw air not pulled through the first radiator. If they don't box it in then most of the air being pulled through the second radiator will be coming from around the first (Path of least resistance and all). However it will still help in radiant heat exchange and thermal capacity of the system.
Just caught up. A friend recommended MORR. I started at the beginning about a month ago and watched them in order. No jumping ahead. Really. I haven’t read many comments, so if this has been mentioned already, apologies. Has Ed ever been tested/fitted for hearing aides? Once my dad got them, he realized he was missing more than half of the conversations. It was a pride thing for him, but ultimately glad he got ‘em.
Wow, that's pretty cool. I think the air should flow through the secondary radiator first, and then through the primary. Temperature difference is important to heat transfer and if the air flows through the primary first the temperature difference may be higher across that radiator, but it would be reduced across the secondary radiator. If the air goes through the secondary first, it will maximize the temperature difference across that radiator, and there should still be a significant difference across the primary because it will always be warmer than the secondary. What are your thoughts?
@@MattsOffRoadRecovery Yeah, I agree. You should see how it works the way you have it first. There may be an efficiency advantage to the air flowing through the secondary radiator first, but it just might not end up making a practical difference here. And if you need to change it then you will know it's done right because it will have been done twice. Can't wait to see this thing move under its own power.
@@MattsOffRoadRecovery Can you get reverse pitch fans that will blow forward, like your forklift likely uses? Or would the air pressure from driving keep that from working properly? Just a thought. I love watching you work with your team!
@@ingluv you can get push or pull fans. I haven't finished the video yet but if the area between the radiators is fully closed off then installing a "pull" radiator on the back of the front radiator will push into the back radiator
I have a guy working for me with just the same work ethic for the job that Lizzy has. I love working with him because if I feel like I'm having a CBA day (can't be arsed), his sheer enthusiasm is so infectious that it's not long before I'm full-on too.
Radiator tech here. You actually want to leave the cardboard on the radiator. It’s supposed to be there to deflect hot air from the environment from entering into your coolant system. You only remove the cardboard if you’re operating your vehicle in cooler climates like Canada or Alaska. I’m surprised you didn’t just install vent covers, that would be much more effective.
that shroud is practically covering the whole back of the radiator, does that not impede the air flow through and behind it? i genuinely want to know how that works
@@Qwertyuiop-wg5xu They will spend most of the time at low speed where you depend on the fan to pull air through the radiator. The Shroud makes sure the fan efficiently pulls air through the whole radiator. You can add one way flaps that suck closed when the fan is pulling, but blow open when going down the road.
This channel is awesome! Thanks for keeping it real and showing how you do things. I'm no engineer but I was hooked when you were explaining the cooling system. This rig is so sick, can't wait to see it in action!
I am SO Proud of you Matt! You posted this very revealing video showing the ongoing engineering feats of a strong mind and a well balanced ego. I am amazed and I learn more watching you "adjusteneering"®™ (a hybrid Matt-Word ®™) and all on a live stage recorded for our learnin' pleasure. Thank You!
Lizzy stepping up to learn a new skill, Awesome Girl!! "I use my eyes on everything I build." Geez, where have I heard that before? Now Lizzy is supervising too, what next whistling? TMI, at least you didn't comb anything else, I hope! The word of the day...Cool! Parts is Parts eh? Well, it is coming along nicely and figuring things out on the fly seems to work as well. Excellent job by the Crew too! Great video coverage as well.
I have always thought the Morvair was the coolest rig but I am really falling in love with this wrecker. I can see the end game now and what an awesome rig she will be!
Genuine question: Should the flow of coolant go through the secondary radiator first? Similarly to a counter-flow heat exchanger, the coolant will be closer to the air temp and therefore lower entropy loss will occur making the system more efficient?
No, you'll get the highest heat transfer if the hottest coolant is going into the hottest radiator. Higher temperature different. Then run the coolant through the coolest radiator last.
As a retired GM technician/engineer, my advice is to use OEM/ACDELCO thermostats on GM vehicles. While thermostats from different manufactures may look the same, they are not and often do not operate properly.
The Wrecker has its own fan boys now I guess everyone has such a dream of building his own dream vehicle from scratch, whether it's an offroad or ratrod or rac vehicle
Matt, especially since you ran into that by-pas issue, you can run coolant from pump to rear radiator first then through front and you'll get a greater total temperature drop. That 195° from front is going to saturate rear radiator. And just leave by-pass heater core circuit the same so you get good heat. Or you can put card board back in lol! I won't bore you with the math I did between oil cooler, condesor, radiator temps. But you should be able to drop 15°-30° per radiator. You just always want your coolest temperature Liquid cooler in the front. Great double radiator idea! I'm super excited to watch this! Gonna be amazing!!! 😃😃😃
I'm one of your Engineer viewers... and I'm thinking about the water mass in the radiator that will be bouncing up against your top H mounting plate. Lots of stress, I don't think that flat plate will hold up. Adding a vertical component to that member would stiffen it up. A couple of angle irons might do it, but would be hard to follow the bends. Perhaps a second layer to a center vertical to triangulate? I also second the motion on cross-flowing the radiators (i.e. feeding them in the other order). Doing so will work much better.
It’s looking great. And knowing you guys can’t wait for the working the kinks phase after it’s running. Your method is very entertaining to watch as it goes along and efficient. Build it, test it, possibly break it and rescue it 😂 then make it better for your purposes. Morrvair is a fine example.
Hey Matt, not sure if it's already been considered but keeping engine oil temperatures too low will actually create unwanted condensation in the engine galleys and passages. The resulting corrosion can bring about some undesired effects. Having seen these effects in the world of aviation many times, I just thought I'd give a heads up. The build is looking great so far.
Ther wrecker project is coming along very well!! You guys got a lot done!! I don't think the average person realizes how much thinking and planning goes into every facet of a build like this. You all are doing a fantastic job!!!
I love this channel! I think you're all a great bunch of folks. I'm half American, half British. I live in the UK, but I spent some time working construction in New Hampshire. Watching you guys work in inches and quarter inches.. it's like it causes me physical pain. 🤣. Millimetres. I think you'd enjoy using them so much. Keep up the good work. That truck is going to be a BEAST!!
Gotta use counter-current flow @Matt's Off Road Recovery It's more efficient, nature works that way (in your hands, feet, ...) Essentially, the hottest coolant is pre-cooled with the hottest air in the rear radiator, then the coolant is fed through the front rad, which can cool it down further as low as ambient air will allow. In your setup, you loose cooling efficiency twice Once over the front radiator where you're already expecting it won't be able to cope on its own, and then you feed warmer-than-possible coolant through the rear radiator that also sees warmer air coming off the first radiator So when it runs hot, you'll know what to change ;-)
My first response was 'well hoses are cheap.' Then I realized that all the hose fittings are all in the wrong places. So it's a bit more complicated. Just have to hope that he's really got more radiator than he needs.
Where I worked, before retirement, we used to call it the smart or dumb end of the measuring tape. Smart end read the measurement, dumb end held the end of the tape to make sure it didn't slip off whatever we were measuring. Measure twice or more cut once and hopefully you got it right. I'm interested to see if your tandem radiator idea works. Usually I've just gotten radiators with more passes to get more cooling and the air went through one time. Looks like one of your radiators is downstream air wise so will be getting hotter air. Correct me if I'm wrong and I'm not against the idea as long as it works.
As someone who design cooling systems for a living, I always have to balance air side pressure drop vs coolant side pressure drop . I think you can simply the system by having one High temp radiator and one mechanical fan .
Love it!!! Fix your weak link before you need a tow. Y’all need to Get a Transfer case pump rub kit. They’re prone to rubbing through and leaving you stranded.
I have a question/comment about the cooling on the heavy wrecker. When running 2 radiators like you are on the heavy wrecker, it seems to me that you would get better cooling if the hottest fluid went to he rear radiator first then to the front one. That way the coolest fluid coming off the front radiator would go straight back to the engine. The way you have it, theoretically the air behind the first radiator will have warmed up to the temperature of the fluid making the second radiator useless. AC coils are designed to have the refrigerant enter in the backside of the air flow and exit in the front for the same reason. Love you channel.
Looking Great! On the tool boxes, I would make them a tad shorter if you can spare the room. On a shop floor, you'll always just be tall enough...but on the trail, as luck would have it, I'm sure they'll be taller because of the terrain.
Brother matt. You know that I live in the hottest region in the world. The temperature in the summer reaches 54 degrees Celsius 130f and the temperature of car machines rises. The solution is not to expand the radiator slots only. The only solution is to add small fans to the radiator from the outside, To compensate for the lost air in the direction of the truck's movement because relying on the zinger fan is not enough.. Try placing two small fans, two will suffice. Then you will feel that the machine is working comfortably.. Your friend from the Middle East 👋🏻
OH-MY-LANTA...I thought I was gonna hear Lizzie swear! That smoke ball trick never ceases to ammuse...LOL "It's a Miller...it welds blue." ~AWESOME!!!~
Just a thought, it would not hurt to make a rubber "saddle" over the top of the inner radiator to make sure it can not work loose and get into the motors fan. added insurance. The hoses may keep it fairly rigid, but considering where this truck will be used, and that Murphy guy is rumored to be living out on those trails.
11:50 why not add just hot water mixing valve? Once the small loop opens, you split the flow with a Y pipe: One goes to the hot side of the mixing valve and one side goes into the 2 radiators and then back to the mixing valve on the cool side. The output of the mixing valve goes into the pump and the heater box. So you first heat up your engine and as soon as the large loop slowly opens it will feed-in hot water to the heater box. As set temperature is met, the mixing valve starts mixing it cool water thought the radiator in, as necessary. You could then add a secondary temperature gauge which looks at the temperature in front of the mixing valve, on the cold side. This way, you know how much cooling capacity you have left. As long as the second temperature is lower as the set temperature, you're in the green. :)
Please keep it up with these detailed explanations! Love learning through your videos. It gives me ideas for my future builds! Love everything yall put out, yall have my dream job haha
The best heat exchange is counterflow. On an tube cooler: when oil flows from right to left the water flows from left to right. The oil comes in hot en drops in temperature. Where it leaves the cooler the cold coolant water gets in. This way you have the most difference in temperature between cooland and the stuff to be cooled. This gives the best heat exchange. Thats why i suggest to connect the outlet of the engine to the rear radiator. Indeed the air is hotter but there will be the most difference in temperature between coolant and air.
Love what you did with the duel radiators. 👏🏼👏🏼👏🏼 I don’t even know if it will work but what I would’ve tried also was to build a fan shroud with electric fans behind the first one that shot the hot air out the side, sucking air from the back and shooting it out to the left or right, then I would’ve done a second fan shroud on the rear radiator sucking air in from the opposite side, this way you get forced air through even when you’re idling or winching and you’re getting rid of the hot air from the first radiator so the second radiator is getting cool air as well. To be completely anal you can also run a fan somewhere on the hood or the bottom they just sucked air out of the engine Arrieta keep the engine area ventilated and keep heat from building up in there. If you were to find a way to use the same fan in two or even three of those applications then you could always have a spare.
The blue smoke prank was hilarious!! See you edited out most of the cussing! Great job on the cooling system and great beard trims on Matt and Trevor! Best channel on UA-cam!
Y’all are so much fun to watch. The knowledge between you guys is just mind blowing. Oh and Matt your radiators will work a lot better if you take the cardboard off. 🤣😂🤣😂🤣😂🤣😂
It’s coming along nicely! Looking sharpe also! Gonna be a Beast when it’s done and on the trails! Can’t wait to see the first recovery!!! Build days are one of the best parts of the channel!!!
Ha, imperial system is so bad, just use metric. "The measure of the inch was usually achieved by adding the thumb breadth of three men- one small, one medium, and one large- and then dividing the figure by three."
excited for Lizzy to keep learning. soon she'll be able to open up her own shop.. when does she get her own build?!? this needs to happen after heavy W. then snowcat before snow again..
Remember that the basic flow of the coolant in this 8.1L engine is backwards, reversed. Like an LS engine, the water flows to the cylinder heads first, then into the cylinder case and out the thermostat. You cannot run this system without a thermostat, it changes the flow of the coolant in the water pump housing when it is open, without the change in flow at this point, the engine overheats.
Vortec 8.1 and LS engines are std cooling flow. In the block, out the heads (well on an ls, out the heads back into the block passage into the water pump). The only common gm engine to run reverse flow was the 90's LT sbc.
@@yeroonvanleeuwen2555 I can't tell what your source of information is, but mine is GM. The main thing that makes the LS engine and the later LT engine so good is their reversed cooling systems. That system was later copied in the 8.1L Mark VI big block engines. Cooling the cylinder head first allows much higher compression ratios on 92 octane fuels and the knock sensors protect the whole shooting match when lower quality fuels are used.
One thing I've learned about cooling systems for slow speed is that the fan and shroud matters more than anything else. As long as you can flow enough CFM, you can cool basically anything.
@@Eyes0penNoFear anything lower than the 210degree coolant is technically cooler as far as the engine is concerned! Seems weird because 110 degrees is hot to a human but cool to an engine
You guys!!! Now I know to bring Lizzy root beer, should I ever visit Hurricane. Whoever thought up the blue smoke bomb, good job. Break the new guy (sort of) in right. Enjoyed the show. Keep up the great work and letting USAll in on the progress.
Feed the back radiator with hot coolant first, that allows a better temp delta for the airflow to coolant for both rads.
That makes the most sense to me. The 2nd radiator is getting the hotter air but that is still enough to cool the initial hot coolant and then the coldest radiator is the last place it goes before the engine.
Yes, this is the laws of thermodynamics. the delta T, keep the hot with the hot, the rear radiator will have the hotter air. Actually the front radiators exit air should NOT be able to go into the rear radiators air. It looks like they have a deflector on the rear but it only goes halfway up, they should make it go all the way to the top of the rear so it gets fresh outside unheated ambient air flow.
Yep! You were thinking what I was thinking. Much like how fish gills work in relation to blood flow and water flow.
Agreed!
exactly this you get colder air to the hottest radiator. rather than trying to cool the coldest coolant with hot air
You got the radiators backwards. Since you are aiming for maximum cooling, it needs to be counter-flow. The air is flowing from front to back, so the coolant needs to flow from the back to the front. Hot water through the back radiator first will be cooled somewhat, then through the front radiator where air is the coolest, to get the coolant to the lowest temperature possible.
Your right!
I think he said at the start that when the thermostat is closed it circulates in the back radiator and when the stat opens it adds the front radiator as the primary.
@@atubebuff , the rear radiator needs to be the primary.
Absolutely
Thank you! Hope they change it to this setup
As a diesel mechanic and welder, I appreciate that you have encouraged and helped Lizzie explore her interests! Employers like you are awesome, she will become an incredibly valuable member of the team with the skills you have helped her develop.
"will become" I think she already is!
Lizzy kicks ass, love her “I want to learn” personality and she’s cute as hell.
Sometimes they become competition
Sometimes you train your employees and they leave. But wouldn't it be worse if you didn't train them and they stayed? 🙂
@@gyoungberg that's a good one
Concept of the Day: "Contraflow"
When doing heat exchange, the two media should be flowing in opposite directions. So if the air is flowing front to back, then the coolant should be generally progressing back to front, i.e. the front-most radiator visited last, just before sending coolant back to the engine.
For clarity, if both circuits of a heat exchanger are plumbed with the same flow direction, then it's a "temperature averager".
That said, everything might work just fine. This is just the basic idea of exchanging heat, applied to this example.
Cheers.
Should, if you want the heat exchanger to save you fuel/electricity bills .. in heating some building, for example. When you return the otherwise wasted heat to where you are heating by burning fuel/electricity, you save fuel, input power, money... When the heat lost to the air is just wasted (it being implausible to add a heat exchanger to each cylinder and expect it to achieve anything , in a reliable fashion... ) , its only a question of , is their enough heat exchanger power ? Factor into that the diminishing returns of radiators, as the air will also do cooling on the huge surface area of metal of the engine...
That's right, the log mean temperature difference (driving force for heat transfer) is greatest in a counter-flow heat exchanger. In a parallel-flow HX, the large initial temperature difference quickly brings the temperatures closer, reducing the average temperature difference.
Yeppers, lowest temp water should also be in contact with the lowest temp air! Otherwise the waste heat will just be reheating the fluids...
Thanx tho, definitely a kool build !!
That makes sense!
Exactly ...
Kinda miss seeing Rudy around in these videos.. He's one of those guys that's always smiling. You need that in the workplace 😁✌
Agreed. My son is about the same age as him. They need to be independent, but it’s tough!
ua-cam.com/channels/hK8eDXz4le2_waQX5_5iuw.html
What happened to him?
@@Cooldibs ua-cam.com/channels/hK8eDXz4le2_waQX5_5iuw.html
@@Cooldibs Just growing up. Wanted to do his own thing and make it by himself in the world. He has his own channel now.
Man, this show has such a wholesome feel to it. Loving what you guys do, it always makes me smile
Engineer here, my primary question after you found the 8.1 was how you were going to cool it. I feel like this episode was for me cheers from Missouri.
Always remember to cover glass when grinding and welding . Vintage glass is hard to find in curves like windshields . And yes it burns in glass .
I learned that welding on my M35A2. it will ruin the glass.
I to have learned this
I learned that lesson the hard way. LOL
Ruined some brand new windows in my grandads workshop with my first grinder. Had only been in a few days
Similar lesson learned when I decided to shoot grinding sparks with a DSLR. The sparks bounced right off the plastic body of the camera and lens, but completely pitted the glass element. Running your finger over the element now feels like sandpaper. That was 12-13 yrs ago, but I still have the lens. Sometimes ya gotta keep results of dumb@$$ery around as reminders.
As one of the 7 engineers, I’d like to say: by creating a longer more complicated path for the water you will create resistance to flow. That means that you will have a lower water flow rate with the stock pump. Most likely this will not cause any issues, if however there is an issue when you drive this thing on hot days you may consider changing the impeller on the pump or getting a pump with a higher flow rate.
I was thinking an additional external pump would help with pressure, but not sure about reliability. If they had the radiators in parallel, it’d actually be less back pressure.
Really I wouldn’t worry about it unless problems crop up.
Favorite comment here😂
I’ll be another one of the seven and agree with what you said.
@@Dozav7 My old car had an electric auxiliary waterpump. It was still on the original pump (which still worked) when I sold the car, when it was 18 years old.
Glad you brought this up. An electric water pump to replace or be added into the system would be a big help, probably.
Absolutely brilliant guys. I was a mechanic, welder and fabricator for 10 years over here in the UK. I had to stop and retrain because my hands stopped working properly. I was also raised in the 4x4 world and still compete in a yellow suzuki as it happens. Wish I could be over there working on your stuff. Keep being awesome 👍💪❤️
Nice
I'm a diesel mech in Australia for fifty years so far, sad that your hands gave out after ten. Retrain, relearn, refocus!
@@glennstatham960 thanks. I have feeling again but a permanent tremor. I work in psychology now. Needed the help after being in the motor trade 😂
Based on my experience with heat exchangers in the process industry, you can get better cooling by running the hot water through the rear radiator first and then through the front radiator.
That's what I was thinking since that's how my condensing furnace works. Run the water first through the rear radiator and then through the front radiator.
if everyone who liked this comment could reply to the comment (like this) then it'll have a better shot at making it to Matt :)
It makes sense from the science of it too... the flow of heat is proportional to the diference in temperature (between coolant and the air flowing past it.. ) but that cooling power that might not be needed . If the separate cooling power of two radiators is well above requirements, then the second radiator can run at less cooling power than its design would allow. All these radiators cooling the coolant are raising the temperature of the air flowing past the engine and exhaust, and thats a lot of surface area that gets air cooled.. so there's a diminishing return on improving radiator performance...
You just threw a monkey wrench into this fabricobble.
Came here to say that exact same thing. Hit the initial water with the cooler that is dealing with hotter air, that will give it a larger gradient to dump heat. Move the then cooler water to the radiator that is working with the coolest air possible to dump off more heat.
Counterflow the radiators. I.E. Feed the rear radiator with water first. You want to maximize the temp difference between the air and the water through the whole system. The higher the temp difference, the better the heat transfer.
So in the front coil, the air is the coolest, so it can continue to cool water that is cooler than in the rear radiator. When the air hits the rear radiator, it's hotter, so you want hotter water in the rear radiator to continue transfering heat into the air.
Hope this helps! This build is awesome!
Also, the straight through shot through the radiator is not what you do. You should series wire them. If you're going to have a bypass from one to the other you put a thermostat in between like you would on a piece of equipment. I would run a dual thermostat off like a caterpillar system basically a road grader tractor piece of equipment system
If you want to bypass circulate also run your heater core from your motor to your heater core and your heater core to the front radiator. Then run an expansion tank with a small line to it and to the heater core. The air bubbles will go through the expansion tank back to the heater core but you won't have a noticeable amount of float through them
That was cute the excitement lizzy had for wanting to learn how to tig weld. You're wisdom and kindness is being passed on. That what life is about. Amazing man! The man who took time to teach me his wisdom was Charlie Taylor R.I.P.
Lizzie has a lot of enthusiasm on the job, and that is great especially on wanting to learn tig welding, hell, just on learning more about everything……that is a great employee, keep her no matter what she asks for as it will benefit both of you
Kevin Haley , Heck yeah... and considering the crap we see Lizzy getting or the amount of "skip over" she endures daily, you are lucky she is even around.
@@BruceNitroxpro I forgot about most of that, disliked letting her walk out of a place with steep canyons for a wedding I think it was, they could have had this guy take her out on the little quad rather than make her walk out….uncool
She is his daughter..........
@@willrector9716 nope, she isn't.
the more skills you learn, it's another tool in the tool box that no one can steal.
You're all just a wonderful team. Thanks taking us along for the ride.
Watching and listening to Matt and crew work is mesmerizing. I don't know enough about motors and vehicle inner workings to understand what he is talking about but I sure enjoy
hearing their banter with each other and what they all have to say. Thank you.
Lizzy SO excited about welding is awesome. She is just the best.
I'd give almost anything to have an employee with her skills, work ethic, and thirst for learning.
so what youre saying is youre hiring terrible people, so the blame is on you
@@23bobjr - LOL!!
No.......My people are good....she's better.
@@christopherweise438 never seen someone get so mad over nothing😂😂 like you complemented Lizzy I don’t know what that guys deal is
Bro is it not so refreshing to see a young woman who is secure in her gender is not all covered in nasty looking Tats and does not have iron hanging off her face. Has a healthy respect for her elders and has killer work ethics. You can tell her parents love her and have taken the time to teach her how to be an excellent human being...You go girl.
@@xippzap - Well said.
Wow! Y’all are killing it! New to the channel. The “can do attitude”, positivity, SKILLS! teamwork, etc…. Thanks for the lessons and hours of useful entertainment. Failed to mention the contribution to community and giving back. America needs more folks like y’all. God Bless! Next time I’m out west hope to stop by and shake your hand. 👍🙏🇺🇸🥓
TIG Weld? OF COURSE Lizzie jumped up and wanted to learn. It's one of the three skills she hasn't mastered yet. Lizzie Rocks!
She needs to do an Apprenticeship, she would blow them away.
which has she mastered? in other words what can she accomplish on her own without anyone being there to help supervise.
@@iffykidmn8170 Let’s see. She just turned 20. She competes in rodeos, teaches dancing (line and swing, I believe), plays piano, sings, does roofing, welds, assists in recoveries and has led several recently, and probably does lots more that we don’t even know about. She is extremely talented, has a super personality, has a drive to learn and excel and is a cute as can be. The skills she has all begin with someone teaching and supervising an interested student and she is still learning. What have you accomplished?
Lizzy you rock!!!
@@JT_70 Getting your goat for starters lol, and I repeat what has she mastered?
I love the lighthearted way your shop interacts - it keeps me smiling and even gets a laugh outta me sometimes- love this channel!
I have an engine oil cooler on my 3500 dualy. Considering the heavier loads you are going to put on a wrecker, especially in the environments you will be running I would highly recommend it. Its really helped out when pulling heavy loads up some steep grades in high heat.
This has to be one of my favourite channels, everyone’s so friendly you feel like your right there with them. Great way to start the Sunday.. and I lost it when Tom lifted Matt’s fingers off the hot rad 😂
Love build days! The way everyone has a good time and still gets stuff done is amazing. Matt is hilarious!
This is a group of solid good guys. So refreshing! Can't wait to see this wrecker on the trails!
It’s wild how entertaining this channel is.
Matt you’re legit funny and the filming is on par.
This reminds me of the old automotive TV shows on Spike that were good.
Those shows had horrible scripting and you could tell that between every scene they had a team of real mechanics doing all the work for them.
Yea those shows were only good to people that go to a shop for an oil change. Lol.
@@leeroyjankins2307 A felon is someone that has been convicted of a felony...Matt wasn't convicted of a felony. Derp
@@leeroyjankins2307 Who gives a shit whether he is or not?
@@leeroyjankins2307 was NEVER convicted dumb fuck.
Go away if you don't have anything to contribute!
🖕💩🤡
Best channel on YT at the moment by a long shot! Lizzie's excitement to learn to TIG weld , the spinning time travel, huge disappointment thermostat and singing! It's got it all! Great work team!
@Dominic Blissett Don't forget some pretty darn fine whistling! :D
Specially as they were turning clockwise yesterday and anticlockwise tomorrow.
That "thing" is a beast. Looking forward to it's first excursion to the rocks and gullies.
Regards from Canada's banana belt. 🤞🇺🇦🕊️🇨🇦🍌👍🦃
Other people may have already pointed this out but since I don't read what other people comment on, here it is and my apologies if I am repeating other people.
You are going to have an issue with water flow because the stock pump is not designed for flow requirement through 2x radiators.
I was going to look smart and state the formula to calculate flow in a heat energy dissipation circuit but I save you the time, suffice to say that if you are doubling your radiator capacity, you will need to at least double your flow (Gal/min) out of your water pump. You will of course figure it all out in time, being the natural born engineer that you are, Matt but most likely an auxiliary electric pump and a new valve/ control circuit will be needed to modify the flow.
Assuming you have the room under the bonnet, consider finding a way to raise the fill port a few inches so it is above both radiators to aid in filling. You need to have a common high point to properly purge the air.
I was going to say something similar. From my experience in building water cooled computers's back in the day before they made main stream blocks and RadFanCoolerReservoirs for them like they do now-- I toyed around with extra large reservoirs where the pump drew from the cooled water in the res than from the cooled water from the Rad. Although this created a condensation effect on hot days from the Res...the system ran cooler with Res to pump to block to rad than drawing directly from the Rad to Pump to block to Res.
It was shocking to see neither of you have ANY fabrication videos on your channel. yet here you are giving advice to a professional fabricator. Dang that is weird stuff.
Came here to say the same thing. As it is, I'd say he will have a issue with air pockets. I'd recommend adding a steam port from the crossover to the fill port.
@@eriklarson9137 it was good advice.
@@eriklarson9137 not all experienced builders have to be youtubers so no need for negative feedback on a valid suggestion. Its a common knowledge that the filler or the reservoir has to be higher than the rest of the system since the air gets trapped in the highest point. To me it seemed that the filler was the highest point so it should work just fine. If its not possible to achieve, there is a bleed valve added to the highest point.
You know Lizzie's mad when you owe her Root beer. The build is moving pretty quick. Can't wait to see this Monster perform.
It’s refreshing to see all the math, thought and user experience that your team uses to build the custom off road projects. My whole life I have built custom equipment that you can’t buy so it’s nice to see I am not alone. Keep up the patience it takes to teach.
I discovered this channel when y'all went to bring the Golden Nugget off the mountain and been watching ever since. Absolutely love this channel and every one of the "characters" involved. Hey Matt....I really enjoy when you teach what you know and are planning. It makes me feel like I learn something every time. Thanks!
I truly miss Rudy it was nice seeing him and Matt together. God bless everyone on this channel :)
Exactly my thoughts!
@@JohnSmith-xn4yr I don't know? Just kind of feels like the loss of a loved one. I hope Rudy is doing okay he's a good boy
@@Breenild thank you for your reply I just hope Rudy is okay. We miss him
@@JohnSmith-xn4yr He's just doing his own channel and his own fabricating. Rudy's Adventure and Design
@@JohnSmith-xn4yr nope, Rudy started his own channel
I just love watching these UA-cam videos from MORR so much, feels just like we're all part of "the team".
As a mechanic of 20+ years I was wondering 16:21 if this motor already had that. Still a great concept of extra cooling, you can never have too much extra cooling capacity!
Same! I was trying to comprehend what he was explaining with the bypass, seemed like he was trying to re-invent the wheel!
These Sunday build videos make me smile. Every time. I watch all your videos, but working in the shop with friends is the best. This one has reminded me to get back on some projects with my friends on my own channel. It was just a fun video. Keep it up Matt and crew!
I always liked to work on things with my dad weather it's cars, boats or lawnmowers. Was never interested when I was younger but I like doing it now
I really enjoyed how Matt explained the cooling process I always find that kind of stuff very interesting and educational. I really enjoy seeing the building process of the wrecker. The practical joke played on Lizzy at the end was priceless. Keep up the great work everyone
Matt, your coolant path is backwards in terms of cooling efficiency. You want the hottest coolant on the engine side, with the coldest coolant at the front of the truck. This makes a counter-current heat exchanger (air is front-to-back, water is back-to-front) and allows for maximum efficiency of heat transfer.
tend to agree, though honestly don't know what else or why run 2....see how it goes I guess
I was thinking exactly that same, otherwise the system would be re-introducing the shod heated air back into second radiator air flow.
@@onecrak you ever been to the second place in the country hotter than h€££?
@@macking104 don't think so but she gets pretty bloody hot where I live🤔😂
The front radiator needs a dip tube to ensure flow goes to the bottom half of the radiator. Also, hot fluid to the inner radiator first to improve cooling as others have commented. It is called counter current cooling if anyone wants look it up.
Matt,
Please take note of these two comments. You may actually make your cooling worse if you don't fix the fluid instability issue in the front radiator. The way it is set up now the hot water will enter the front radiator, flow through the top portion and flow out the top. The hot water will never reach the bottom of the radiator especially when you are driving and cooling the fluid that is in the bottom half. The cooler/denser fluid in the bottom won't mix with the hotter/thinner fluid in the top. There is a reason the inlets and outlets on radiators are on opposite corners. Also swap the radiator flow. The radiator with the cooler fluid should have the cooler air. Otherwise you could end up with the second radiator fluid and air temps being very close together which would negate any cooling effect.
Dude.. you're a genius 🇺🇸👍
I had a buddy of mine who use to help me work on my Jeep, like most backyard mechanics he knew wrench sizes and their order. Well he also would come work for me building houses and struggled with reading a tape measure until finally one day it dawned on me to hand him a tape measure and asked him that if I had a 1/2" wrench but it was too small what size wrench you hand me next, he 9/16", yes, but it's still a little small, what size are you handing me now, he said 5/8". I smiled , had him look at the tape and told him, you just learned how to read a tape measure. Never had a problem ever again with reading measurements. Just a little life lesson I had and figured maybe it could help others to grasp reading a tape measure.
Really enjoyed the in depth cooling explanation! I wonder though, would it be better having the flow direction going the other way? IE, hot water goes into the rearmost radiator, then into the front one, so that the coolest air is cooling the already cooled water? I wonder if in the current setup the second radiator .ay have little to no effect due to the cooled water and heated air being to close in temperature to work well?
You are correct, I've replicated this same problem myself when building watercooled PCs. Same concept. You want each radiator to have clean, cool air for maximum cooling power. If they are stacked you are only getting like 20% efficiency out of the extra rads.
Yes, this
It's actually impossible to tell really without some air flow testing. Given that Matt prefers mechanical fans the second radiator will have the most draw through it even if fully boxed in. As there is a split down for the condenser and second radiator to draw air not pulled through the first radiator.
If they don't box it in then most of the air being pulled through the second radiator will be coming from around the first (Path of least resistance and all). However it will still help in radiant heat exchange and thermal capacity of the system.
Yes, I second that. Nicely explained! (Engineer working in fluid dynamics and thermodynamics)
Yep I agree as well… Matt has a way of thinking/not thinking but his way works for him. We all a friend like that lol
That rig is going to be a beast! Can't wait to see it completed. Great job everyone!
Just caught up. A friend recommended MORR. I started at the beginning about a month ago and watched them in order. No jumping ahead. Really.
I haven’t read many comments, so if this has been mentioned already, apologies. Has Ed ever been tested/fitted for hearing aides? Once my dad got them, he realized he was missing more than half of the conversations. It was a pride thing for him, but ultimately glad he got ‘em.
Can't answer that question, but I can assure you that I have not seen it asked before. And I always read the comments section.
Wow, that's pretty cool.
I think the air should flow through the secondary radiator first, and then through the primary. Temperature difference is important to heat transfer and if the air flows through the primary first the temperature difference may be higher across that radiator, but it would be reduced across the secondary radiator. If the air goes through the secondary first, it will maximize the temperature difference across that radiator, and there should still be a significant difference across the primary because it will always be warmer than the secondary.
What are your thoughts?
@@MattsOffRoadRecovery Yeah, I agree. You should see how it works the way you have it first. There may be an efficiency advantage to the air flowing through the secondary radiator first, but it just might not end up making a practical difference here. And if you need to change it then you will know it's done right because it will have been done twice.
Can't wait to see this thing move under its own power.
@@MattsOffRoadRecovery Can you get reverse pitch fans that will blow forward, like your forklift likely uses? Or would the air pressure from driving keep that from working properly? Just a thought. I love watching you work with your team!
@@ingluv you can get push or pull fans.
I haven't finished the video yet but if the area between the radiators is fully closed off then installing a "pull" radiator on the back of the front radiator will push into the back radiator
@@ingluv I don't know if you'd want to push the air forward against the natural flow when driving.
You can tell Matt’s real passion is building, he just goes out to recover to get fresh air
as someone who works alone.. every day.. for over ten years... its great to see you guys work together.
I have a guy working for me with just the same work ethic for the job that Lizzy has. I love working with him because if I feel like I'm having a CBA day (can't be arsed), his sheer enthusiasm is so infectious that it's not long before I'm full-on too.
Radiator tech here. You actually want to leave the cardboard on the radiator. It’s supposed to be there to deflect hot air from the environment from entering into your coolant system. You only remove the cardboard if you’re operating your vehicle in cooler climates like Canada or Alaska. I’m surprised you didn’t just install vent covers, that would be much more effective.
my truck has covers for that reason but it is a diesel pickup ..never used the cover but it takes about 15 mins to get heat when its below 0 degs F ..
that shroud is practically covering the whole back of the radiator, does that not impede the air flow through and behind it? i genuinely want to know how that works
@@Qwertyuiop-wg5xu They will spend most of the time at low speed where you depend on the fan to pull air through the radiator. The Shroud makes sure the fan efficiently pulls air through the whole radiator.
You can add one way flaps that suck closed when the fan is pulling, but blow open when going down the road.
God ! I love Matt and his crew! They are the best quality people to watch at work. And what fantastic work they do!
This channel is awesome! Thanks for keeping it real and showing how you do things. I'm no engineer but I was hooked when you were explaining the cooling system. This rig is so sick, can't wait to see it in action!
I am SO Proud of you Matt! You posted this very revealing video showing the ongoing engineering feats of a strong mind and a well balanced ego. I am amazed and I learn more watching you "adjusteneering"®™ (a hybrid Matt-Word ®™) and all on a live stage recorded for our learnin' pleasure. Thank You!
Lizzy stepping up to learn a new skill, Awesome Girl!! "I use my eyes on everything I build." Geez, where have I heard that before? Now Lizzy is supervising too, what next whistling? TMI, at least you didn't comb anything else, I hope! The word of the day...Cool! Parts is Parts eh? Well, it is coming along nicely and figuring things out on the fly seems to work as well. Excellent job by the Crew too! Great video coverage as well.
I have always thought the Morvair was the coolest rig but I am really falling in love with this wrecker. I can see the end game now and what an awesome rig she will be!
Genuine question: Should the flow of coolant go through the secondary radiator first? Similarly to a counter-flow heat exchanger, the coolant will be closer to the air temp and therefore lower entropy loss will occur making the system more efficient?
Seems like a good question.
No, you'll get the highest heat transfer if the hottest coolant is going into the hottest radiator. Higher temperature different. Then run the coolant through the coolest radiator last.
I had a 850 holly carb on a 350 LT in a '70 Camero that I could not keep cool for around town driving.
@@Bryan-Hensley right, and the rear radiator will be the hottest so it should be first in series
I can't wait to see how this works I think it should work great. Very "COOL"
I freakin LOVE the "snap" changes.
All of you have the best sense of humors - wish I was closer.
As a retired GM technician/engineer, my advice is to use OEM/ACDELCO thermostats on GM vehicles. While thermostats from different manufactures may look the same, they are not and often do not operate properly.
Same way with Cummins.
The Wrecker has its own fan boys now
I guess everyone has such a dream of building his own dream vehicle from scratch, whether it's an offroad or ratrod or rac vehicle
Matt, especially since you ran into that by-pas issue, you can run coolant from pump to rear radiator first then through front and you'll get a greater total temperature drop. That 195° from front is going to saturate rear radiator. And just leave by-pass heater core circuit the same so you get good heat. Or you can put card board back in lol! I won't bore you with the math I did between oil cooler, condesor, radiator temps. But you should be able to drop 15°-30° per radiator. You just always want your coolest temperature Liquid cooler in the front. Great double radiator idea! I'm super excited to watch this! Gonna be amazing!!! 😃😃😃
I'm one of your Engineer viewers... and I'm thinking about the water mass in the radiator that will be bouncing up against your top H mounting plate. Lots of stress, I don't think that flat plate will hold up. Adding a vertical component to that member would stiffen it up. A couple of angle irons might do it, but would be hard to follow the bends. Perhaps a second layer to a center vertical to triangulate?
I also second the motion on cross-flowing the radiators (i.e. feeding them in the other order). Doing so will work much better.
Gussets?
It’s looking great. And knowing you guys can’t wait for the working the kinks phase after it’s running. Your method is very entertaining to watch as it goes along and efficient. Build it, test it, possibly break it and rescue it 😂 then make it better for your purposes. Morrvair is a fine example.
Hey Matt, not sure if it's already been considered but keeping engine oil temperatures too low will actually create unwanted condensation in the engine galleys and passages. The resulting corrosion can bring about some undesired effects. Having seen these effects in the world of aviation many times, I just thought I'd give a heads up. The build is looking great so far.
Being an engineer myself I enjoyed the explanation. Looking forward in seeing if it works!!
Feeling the same way. 👍🏻
Ther wrecker project is coming along very well!! You guys got a lot done!! I don't think the average person realizes how much thinking and planning goes into every facet of a build like this. You all are doing a fantastic job!!!
I love this channel! I think you're all a great bunch of folks. I'm half American, half British. I live in the UK, but I spent some time working construction in New Hampshire. Watching you guys work in inches and quarter inches.. it's like it causes me physical pain. 🤣. Millimetres. I think you'd enjoy using them so much. Keep up the good work. That truck is going to be a BEAST!!
I sure like Lizzie’s “Can-Do” attitude, and I’m thankful to Matt for letting her do most any of the jobs.
Someone teach her TIG welding stat! 1:33
@@61Slughi I'm going to marry that woman!
She's got so many skills & interests. It's a very active life with Matt's rescue team.
grooming
But is it real? This production has people doing thing they wouldn't normally do.
Gotta use counter-current flow @Matt's Off Road Recovery
It's more efficient, nature works that way (in your hands, feet, ...)
Essentially, the hottest coolant is pre-cooled with the hottest air in the rear radiator, then the coolant is fed through the front rad, which can cool it down further as low as ambient air will allow.
In your setup, you loose cooling efficiency twice
Once over the front radiator where you're already expecting it won't be able to cope on its own, and then you feed warmer-than-possible coolant through the rear radiator that also sees warmer air coming off the first radiator
So when it runs hot, you'll know what to change ;-)
There's no gotta.. its only "is there enough radiator cooling power ? ". will the hottest water pumped in return to the engine at 90C ?
My first response was 'well hoses are cheap.' Then I realized that all the hose fittings are all in the wrong places. So it's a bit more complicated. Just have to hope that he's really got more radiator than he needs.
@@isilder Well, Matt's set-up is effectively destroying part of his radiators' cooling power,
by cascading the radiators the wrong way around.
Where I worked, before retirement, we used to call it the smart or dumb end of the measuring tape. Smart end read the measurement, dumb end held the end of the tape to make sure it didn't slip off whatever we were measuring. Measure twice or more cut once and hopefully you got it right. I'm interested to see if your tandem radiator idea works. Usually I've just gotten radiators with more passes to get more cooling and the air went through one time. Looks like one of your radiators is downstream air wise so will be getting hotter air. Correct me if I'm wrong and I'm not against the idea as long as it works.
when you cut out his tacks. lmfao. “your dad isnt proud”
I was in stitches, hahaha
I always looked up and said “ I wonder where the chickens were roosting for the poop to land there?”
As someone who design cooling systems for a living, I always have to balance air side pressure drop vs coolant side pressure drop . I think you can simply the system by having one High temp radiator and one mechanical fan .
Yeah but that doesn’t look cool!
Love it!!! Fix your weak link before you need a tow.
Y’all need to Get a Transfer case pump rub kit. They’re prone to rubbing through and leaving you stranded.
It's starting to look like a mean lean towing machine! You handled the issue with the bypass thermostat very well, Matt! Hang in there.
Love this build & the extensive planning going into it. Great work everyone involved!
I have a question/comment about the cooling on the heavy wrecker. When running 2 radiators like you are on the heavy wrecker, it seems to me that you would get better cooling if the hottest fluid went to he rear radiator first then to the front one. That way the coolest fluid coming off the front radiator would go straight back to the engine. The way you have it, theoretically the air behind the first radiator will have warmed up to the temperature of the fluid making the second radiator useless. AC coils are designed to have the refrigerant enter in the backside of the air flow and exit in the front for the same reason. Love you channel.
Ohhh the bead roller for the water lines 👍 so good. Can't wait to see the cooling in action, very interesting
Looking Great! On the tool boxes, I would make them a tad shorter if you can spare the room. On a shop floor, you'll always just be tall enough...but on the trail, as luck would have it, I'm sure they'll be taller because of the terrain.
Brother matt. You know that I live in the hottest region in the world. The temperature in the summer reaches 54 degrees Celsius 130f and the temperature of car machines rises. The solution is not to expand the radiator slots only. The only solution is to add small fans to the radiator from the outside, To compensate for the lost air in the direction of the truck's movement because relying on the zinger fan is not enough.. Try placing two small fans, two will suffice. Then you will feel that the machine is working comfortably.. Your friend from the Middle East 👋🏻
OH-MY-LANTA...I thought I was gonna hear Lizzie swear! That smoke ball trick never ceases to ammuse...LOL
"It's a Miller...it welds blue." ~AWESOME!!!~
Just a thought, it would not hurt to make a rubber "saddle" over the top of the inner radiator to make sure it can not work loose and get into the motors fan. added insurance. The hoses may keep it fairly rigid, but considering where this truck will be used, and that Murphy guy is rumored to be living out on those trails.
11:50 why not add just hot water mixing valve? Once the small loop opens, you split the flow with a Y pipe: One goes to the hot side of the mixing valve and one side goes into the 2 radiators and then back to the mixing valve on the cool side. The output of the mixing valve goes into the pump and the heater box.
So you first heat up your engine and as soon as the large loop slowly opens it will feed-in hot water to the heater box. As set temperature is met, the mixing valve starts mixing it cool water thought the radiator in, as necessary.
You could then add a secondary temperature gauge which looks at the temperature in front of the mixing valve, on the cold side. This way, you know how much cooling capacity you have left. As long as the second temperature is lower as the set temperature, you're in the green. :)
Love Lizzy's enthusiasm about learning to TIG weld. Such a well rounded young lady!
Wow, that's a lot goin on with the wrecker. It's looking great. I'm sure Lizzy will pick up tig welding really quick
I just adore Lizzy! She amazes me with all the stuff she's willing to do. Welding is one. Love your channel.
Matt’s electrical tape on finger instead of a bandaid is the true sign of a real fabricator.
Hehe..... I have used bore patch and duct tape to bandaid a shooting range booboo. You make do with what you have! 😄
Please keep it up with these detailed explanations! Love learning through your videos. It gives me ideas for my future builds! Love everything yall put out, yall have my dream job haha
The best heat exchange is counterflow.
On an tube cooler: when oil flows from right to left the water flows from left to right. The oil comes in hot en drops in temperature. Where it leaves the cooler the cold coolant water gets in. This way you have the most difference in temperature between cooland and the stuff to be cooled. This gives the best heat exchange.
Thats why i suggest to connect the outlet of the engine to the rear radiator. Indeed the air is hotter but there will be the most difference in temperature between coolant and air.
Hey Lizzy! Learning to TIG weld bad is easy: it's learning to TIG weld good is the hard bit.
Love what you did with the duel radiators. 👏🏼👏🏼👏🏼 I don’t even know if it will work but what I would’ve tried also was to build a fan shroud with electric fans behind the first one that shot the hot air out the side, sucking air from the back and shooting it out to the left or right, then I would’ve done a second fan shroud on the rear radiator sucking air in from the opposite side, this way you get forced air through even when you’re idling or winching and you’re getting rid of the hot air from the first radiator so the second radiator is getting cool air as well. To be completely anal you can also run a fan somewhere on the hood or the bottom they just sucked air out of the engine Arrieta keep the engine area ventilated and keep heat from building up in there. If you were to find a way to use the same fan in two or even three of those applications then you could always have a spare.
The blue smoke prank was hilarious!! See you edited out most of the cussing!
Great job on the cooling system and great beard trims on Matt and Trevor! Best channel on UA-cam!
Y’all are so much fun to watch. The knowledge between you guys is just mind blowing. Oh and Matt your radiators will work a lot better if you take the cardboard off. 🤣😂🤣😂🤣😂🤣😂
Couldn't actually believe the tyre kickers out there . Matt's Good that wayz
It’s coming along nicely! Looking sharpe also! Gonna be a Beast when it’s done and on the trails! Can’t wait to see the first recovery!!! Build days are one of the best parts of the channel!!!
When you take the cardboard off the radiators don't forget to remove the plastic strapping. :)
"Its gunna be a pretty shrill noise"
*everyone puts on hearing protection except matt
Matt: "That's pretty loud, isnt it?"
😂
18 inches long so that's 36 halfs!
Excellent eyecrometer work!
I can't wait to see the first rock crawl with this thing.
Ha, imperial system is so bad, just use metric. "The measure of the inch was usually achieved by adding the thumb breadth of three men- one small, one medium, and one large- and then dividing the figure by three."
The wrecker continues to evolve and Lizzie continues to impress - well done guys.
excited for Lizzy to keep learning. soon she'll be able to open up her own shop.. when does she get her own build?!? this needs to happen after heavy W. then snowcat before snow again..
Remember that the basic flow of the coolant in this 8.1L engine is backwards, reversed. Like an LS engine, the water flows to the cylinder heads first, then into the cylinder case and out the thermostat. You cannot run this system without a thermostat, it changes the flow of the coolant in the water pump housing when it is open, without the change in flow at this point, the engine overheats.
Vortec 8.1 and LS engines are std cooling flow. In the block, out the heads (well on an ls, out the heads back into the block passage into the water pump). The only common gm engine to run reverse flow was the 90's LT sbc.
@@yeroonvanleeuwen2555 I can't tell what your source of information is, but mine is GM. The main thing that makes the LS engine and the later LT engine so good is their reversed cooling systems. That system was later copied in the 8.1L Mark VI big block engines. Cooling the cylinder head first allows much higher compression ratios on 92 octane fuels and the knock sensors protect the whole shooting match when lower quality fuels are used.
Looking excellent, can't wait to see it finished, all the best to yous and your loved ones
Love how excited Lizzy is to learn TIG from TomTom
One thing I've learned about cooling systems for slow speed is that the fan and shroud matters more than anything else. As long as you can flow enough CFM, you can cool basically anything.
Does that still apply when it's over 110° F in the shade, and it's being worked out in the hot sun?
Sincere question.
@@Eyes0penNoFear
Yes
@@Eyes0penNoFear anything lower than the 210degree coolant is technically cooler as far as the engine is concerned! Seems weird because 110 degrees is hot to a human but cool to an engine
Oh No, She let the “magic blue smoke out” !! Don’t throw smoke bombs lit, they explode. Great work ! Thanks for sharing!
You guys!!! Now I know to bring Lizzy root beer, should I ever visit Hurricane.
Whoever thought up the blue smoke bomb, good job. Break the new guy (sort of) in right.
Enjoyed the show. Keep up the great work and letting USAll in on the progress.