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S3 E24 & 25. 670 predator powered Renault gets a new exhaust plus upgrades
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- Опубліковано 15 сер 2024
- Season 3 Episode 24 & 25. Jimbo builds a new exhaust system for the 670 cc predator powered Renault. While the engine was out of the car Jimbo makes several upgrades including removing the governor and adding some upgrades the the drive system.
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Jimbo
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Unequal length exhaust? Subaru guys approve! 👍 😎
I built a similar unequal length exhaust for my suzuki sv650 so that the exhaust would exit under the seat. I did back to back runs on the same dyno With the unequal exhaust and my oem exhaust That was cut and fitted with An aftermarket muffler. The result was a nine horsepower loss using the unequal length exhaust .
The exhaust looks neat, but definitely produced horrible results
@@AverageJoesracingteamSubaru guys don't care about power. They barely stay running stock.
Cries in ringland failure
Better than the stock muffler.. which was likely unequal length as well.
@@AverageJoesracingteamYeah, actual Subaru tuners are well aware how inefficient UELHs are, which is why equal length options are out there, but plenty of people prefer the burble and can live with leaving some power on the table.
You’re the Mr Rogers of small engines. Thank you for being my neighbor!
I sure hope he did that testrun in the early morning, when everybody were asleep! :-D
Now we just have to hope that Mr. McFeely's Speedy Delivery is bringing the parts for the next episode.
@@DeadKoby That is truly funny. It took me a minute...
@@antoniovillanueva308 Maybe upon delivery they will sing a song about it.
Jimbo, please think of using a snowmobile torque converter instead of the stock one. You're not running much power through it, but the vehicle weights noticably more than what it was technically designed for so it might slip without you even noticing. The guys from carsandcameras were using a stock torque converter in their small dragster build with an uprated V-twin like yours & they were losing noticable amounts of power & acceleration despite their build weighing nowhere near as much as the Renault
He’s not using the stock one, go back and watch the build series.
@@alexcoronathe output on a snowmobile might be heavier duty, but it's not what he's using.
It’s not stock. It’s a modified comet magnum 44.
Snowmobiles have 70+ horsepower, so yeah they have to have a much beefier CVT
We are using a Comet 44 series clutch system and its rated for 18HP. we are aware of its limitations and do plan on upgrading it to a Comet 700 series at some point.
You're giving tips to a guy who was once a Michigander, and I'm sure at some point he dabbled in snowmobiles. This ain't his first rodeo.
I'm enjoying how loud it is at 13mph 😂
It would be cool to see you put an O2 sensor on each pipe just before they merged. The individual cylinder data would be great for tuning.
Your neighbors love this project. They don't even need an alarm clock anymore.
My weekend last week felt so incomplete without my Jimbo fix. Thanks for a complete weekend this week!
Never want an episode, to end.
Jimbo, you just might've created the perfect UA-cam channel.
Thanks for bringing us all, along.
Pro tip. Once you have the header wrapped absolutely saturate the wrap with header paint. It glues it down and all but eliminates the pokies.
Thanks! I'll give it a try the next time we have the header out of the car.
Also, the wrap soaks up the paint like a sponge. You'll need more paint than you think.
I use my tig torch to melt thru the “spoon appendages” on governors. 50% of the time it works every time
What about the compression relief
Sounds like you have a plan....lol
@robotcantina8957 Hahaha, and still better than "hoping".
She’s a bit spicy now, or at least it sounds the part.
I’d be interested in seeing a tach on the engine and on the trans input shaft, with maybe some wizardry that displays realtime RPM differential. To get an idea on where the CVT is in its operation.
Also, possibly already suggested or mentioned, but that carb tuner thing that Thunderhead may be a good candidate for testing on this setup (or vise-versa?).
Top notch video! I hope you’re enjoying making them as much as we love to watch them. Cheers!
When I was a kid we used to call the cheap, underpowered 4-cylinder engines lawn mower engines, because they sounded like them. Here, you took a real lawn mower engine and made it work! My hat's off to you, sir.
Sounds better than those cheap 4 cylinders too
I think a good stage two kit would be very deserving of being put into that engine. A stage 3 would be even better and those 670cc engines have a massive after market community.
HEY JIMBO! I have watched your channel for a long time but do not typically comment on videos. Anyway, me and a friend of mine did a full street legal build on a small UTV/SXS that is 300cc. The engine is based off of a Yamaha motorcycle engine with a CVT. It was loud and would not pass auto inspection. So what we did is replace the muffler with a newer but quieter version. Then we had an exhaust shop weld an exhaust flange to the end of the motorcycle muffler, then had the exhaust shop make some custom pipe from the new flange to a car muffler and also did some mods to hang the car muffler. We went with a Walker quiet flow. I think we paid like $35 for it. Anyway, this setup is basically using a stock motorcycle muffler as a resonator then a car muffler for the rest. It is very quiet now and you can't even hear it idle 100 feet away. It is not as loud on the street either and we can now play the radio. Just a thought for your setup for the muffler. May not be what you are looking to do but I am sure gave you some ideas. Love the videos. Thanks!
Thanks! We have already picked a glass pack muffler that provides a mellow sound without restricting the exhaust. It may not be as quiet as a Cadillac, but it should be good enough for rural Kansas. This will of course be in the next video.
@@robotcantina8957 Thank you for taking the time to respond!
It seems like this project is making far quicker progress than any of the others. I love your statement of "finding some new problems". That's excatly how all projects work!
You've done forced induction, so might be fun to see how compression and head work effect things. I've welded up both 212 and 420 heads (up to 12:1 or so range), and it made a big increase in power, and I believe fuel consumption. Cost me some time and welding supplies. I'd grab a spare set of heads to mess with as you do other things, though, in case you get a whoopsie like I did once. Don't drink and weld, kids.
Coffe and Cantina to start the day, why thank you, I believe I will!
Sundays have got to be my favorite day for the plethora of people i follow, sundays are some of the best.
That CVT unit doesn't sound like it's really getting to the top of it's range (1:1-ish) until the engine is way up in it's RPM range. Maybe some looser springs in the driven unit and the gears in the transmission would be more useful? Right now it's like "pick a gear, any gear."
And a snowmobile cvt
For any incidental sharp things that get into ya from wrapping headers or any sort of fibers like fiberglass, a pair of brand new pantyhose works best, polyester will do similar but not as well, use pantyhose as a washcloth in a nice hot shower. Low pressure against the skin with lots of soap lather, and it pulls a majority out first go. It's a mad good way to take care of it when doing insulation or anything where you end up with small painful fibers in your skin. Hope this helps at least one person lol
Thanks!!!!!!!
@@robotcantina8957 no problem! That stuff can cause an itch that can only seem to be fuels by Satan himself haha it can make for a rough day
get some gasket sheets and make one, it's usually done in 15 minutes once you get the hang of it, squeeze the gasket-paper against the surface you wanna match and the contours will show you where to cut... i haven't bought gaskets in years, i only make them from sheets.
In a pinch a cereal box will frequently work as gasket material, especially if gasket thickness isn't going to have an effect on other tolerances.
That cover looked like one side of a cereal box would have been the perfect size to cut a gasket from.
LOL - that second gear take-off had me laughing.
Could do with a long chamber muffler to take out the raspy note, but retain the deep V-twin sound.
I have a Kawasaki Brute Force 750, the guy I bought it from changed the factory exhaust to a KMF straight pipe type muffler, and it bike is incredibly loud, so much so, I didn't think I'd be able to use to go hunting. So, I took a stroll to the junkyard, and found a factory Stainless muffler on a 1990 Mitsubishi pickup, with a little welding of a flange, and a hanger. The muffler inserts into the KMF muffler, and shaves a large amount of noise off the bike that makes it very suitable for being in the woods, and after taking some full throttle rips, doesn't hurt the top end too much(At least the highest I'm willing to feel the top end, doing 60mph on some 29.5" High Lifters is the limits of my bravery.).
The muffler is also plug and play, I can pull if off and be loud for some mudrides, and throw the extra muffler on, and you hear the engine noise just as loud as the puffs from the back.
I say all that, as a suggestion, to find a large style 4-cyl exhaust, to not hurt the power of the engine, and still get a factory/OEM sound. Bonus points for old school flapper cutout.
396 BBC and a 4 speed M21 ?
I have found my Tribe ! 🤣
But seriously, thanks for all the mechanical shenanigans and entertainment.
It makes every weekend feel like Saturday morning cartoons.👌😀👍
That 4th gear rolling start sounded great! 😂
Cereals packets make great gaskets. Years (and years) ago me and my mates would make our own gaskets from Cornflakes boxes, because they were free and often better than factory items. You can make hole punches from odd bits of tubing and taper the ends with a file or stone.
You can also buy that fibre gasket by the sheet. It's pretty cheap and it will come in handy one day, trust me.
Us Subaru folks are happy! Unequal length headers is a bit of our thing!
YES!!!! count me in... unequal length headers rule!... Meh..because I'm too lazy to make equal length..
So is breaking down, let's hope this doesn't do that often
@@robotcantina8957 Header length isn't so important with a turbocharger anyway! 😀
Begin the Turbo chant!
What a weird/waste of time thing to embrace. Is there nothing more exciting about Subies than header type?
Sunday morning routine is now complete! Love the results, can't wait for the tuning portion next week 🙌
Listening to the engine as you accelerated got me to thinking. A cheap way to shave a bit more time off of the old 0 to 55 would be to get a tuning kit for the torque converter.
If you're putting an AFR sensor in, how about using Uncle Luke thunderhead289's special carb cheater on this and seeing how it works?
yeah seeing that system here would be awesome.
When you removed the governor it felt like I was watching How it's Made for a minute. That's pretty neat.
Man I got really sad last week when I didn’t see an upload. But this episode really made up for it!! Keep killing it sir, you’re about to be UA-cam famous!
I smile when you say "I chucked them in the lathe"...
You can purchase sheets of gasket material.. I use Felpro gasket material for situation as you have.. simply put a little grease on the parts surface lay on paper and imprint cut it out. You can use the bolts for punch against a board. If you look at a bolt the end is made just for this it will cut the gasket material...😎 8 N Ford tractor muffler would work... I use to use them on Onan generator for Motorcoach.
u can also hold it in place and knock around the edges with a soft-ish blunt tool like the handle of a screwdriver. tap it enough and u'll actually cut it clean. learned that from an old lazy mechanic :D
Nice to see one of the most despised Renault (in France at least) getting some care and enhancements.
I might need one of these engines for my already CVT-transmissioned DAF 31, it might actually make it faster than stock! Also could help with the whole expensive parts thing.
I had to google DAF 31... Hmmm... a nice looking little car. I reckon updating the engine to something more modern might make the car more practical and cheaper to maintain.
The chop is real with this youngling.
Running 60mph and holding back on the throttle? This thing is awesome 😂
Hearing a Harley-esque exhaust with a CVT acceleration band is definitely an interesting sound to behold
The treadmill almost got me at first 😆
"Correct gasket" is to glue gasket paper to the cover with contact cement.
Then cut off all the excess paper.
A rule of thumb for header pipe diameter is the exhaust valve diameter.
Make the header pipe long enough to contain 100% or more of the cylinder displacement.
Thanks, jimbo. I look forward to this every week. Your channel is like Saturday morning cartoons for men.......on Sunday lol
Finally my favourite channel uploaded new video, so i can use free time on very important thinks ❤❤
AND actually, you dont need to dissasemble the engine, you can just bypas the guvernor by eliminating the springs and just putting backspring so it would not stayed open, I was really thinking about how to bypas the slow throtle responce, but keep the rev limiter for my cheapo 200cc china engine, and i came up with solution, that i will stick a lever directly in front of the guvernor that will push it only to the half and stop, use spring , that it will stretch the sping after the lever would bottom out somewhere around half or more throtle, and merge the original throtle with the directly pushing carburator half limited throttle after the spring part, so it would react instantly to about half (or more, it just need to be less than the position when the guvernot keeps the revs low) and still be limiter on max revs.
I was really hoping you were going to run stacks with little flappers on top
You guys really improved your editing skills. Nice to watch
I think a supertrapp muffler would be good- it's compact and gives you the ability to tune it with different plates. Used to be popular on old air cooled VWs. Your current rig sounds a lot like my friend's Super Beetle from highschool. And it's about as fast. Lol. Just needs some Black Sabbath playing through the Pioneer 6x9s and some burning parsley.
Sounds like you need a carburetor with an accelerator pump in it. Maybe a Rochester 2GC, Carter BBD, Weber 32/38 or 38/38? Or, being those are made for much larger displacement engines (318s, 350s and such), maybe a 1 barrel car carb? Dayton Carburetor makes a 1 barrel with an adjustable main jet in it. It's based on the Holley 1920.
I felt the car was performing better as soon as you got it on the road. It seems this baby could really move (relatively speaking). Can't wait for the next episode. Keep up the good work Jumbo.
The way you fix the gasket deal is you glue gasket material onto the gasket surface with Gaskacinch, then trim off the excess with an exacto-knife.
Another matter: you might wish a larger oil cooler, with a scoop to direct air over it at speed.
You’re going to have a million people point out that the tube should be an equal length, but it can be more complicated than that depending on the design of the engine. Anyway, the lengths matter and are something that gets tuned for max power or economy.
This project is so fun to watch. It makes me want to buy a mini-truck out of a salvage yard to build my own.
owo. You means trucks like the BRAT or Rabbit pickup?
@@SonicBoone56 Yes, a little Datsun, Mazda or similar.
I'd love to see the reaction from the locals if you drove it with the exhaust as is around Paris :)
to bad modifications aren't legal in France they'll impound / cruch it if he was to bring ot over there
@@lotuseater92 Yeah, the EU in general is a shithole to own a cool car.
Dude, IDC what you do, its always a blast just going along for the ride.
Cut the center out of the spacer under the carb and it will let both cylinders use both barrels
You really don't want that, each cylinder has its own flow characteristics. You think you're going to make your carburetor tuning simpler, but what you're doing is compromising the tuning on both cylinders.
We may try 3D printing something like that as a test.
Pro top: Duct tape helps pull those little fibers out of your skin. Works with fiberglass and those stupid fuzzy cacti as well!
If you ever need a custom gasket, I've had great success using a flatbed scanner and a laser cutter.
Either scan an original gasket or make a tracing of the mating surface and scan that. You can even just take some measurements and quickly draw something up in any vector drawing program.
Buy a sheet of gasket material and you can cut out a very clean and accurate gasket in less than a minute. You don't even need a particularly good laser cutter - those cheap K40 things will work fine. A blue diode laser cutter should work too. You can get either for just a few hundred bucks.
I made a whole bunch for a local car club and they worked great.
I'm very surprised you aren't the type of person to have big rolls of gasket paper around to make your own gaskets at any given moment, hahaha. Also coulda gone with RTV of course. Holy crap this thing is loud and sounds ridiculous now. Loving the videos as always.
Please consider getting some gasket paper, some wad punches and a small ballpein hammer. It's pretty quick and easy making your own gaskets actually. I do it all the time on honda 125cc motorcycle engines. If you use "Hylomar Universal Blue" as a sealant for the gaskets, they never leak and never tear on disassembly so you can use them again. It's so good you can even reassemble with torn gaskets without leaks. It's fuel stable too. I used to use it all the time when I used to race motorcycles.
Fun episode(s). I really like the easy-to-see Speedometer! Homerun!
This is by far your best project yet.
Years ago I had a Subaru Justy with a 1.3 liter 3 cylinder engine, and the best muffler I could find was for a garden tractor, which I got at Tractor Supply.
2:39 I think your gonna have problems tuning the carb, along with exhaust scavenging issues with the unequal length exhaust header.
I would love to see some go pro footage of the CVT working. It's interesting the way the RPMs go high then as thecvt kicks in the engine slows back down and slowly reaccelerates. Very cool project.
At that point a 2 in 2 header would make more power, just a few inches of inequality is ok but that much is not, it hurts the power pretty bad
this is a fun build to watch and you give lots of the right kinds of details. thanks for sharing your findings and experience.
VGG on Friday and Jimbo on Sunday means a perfect weekend for me! 😁
Tony Angelo's Stay Tuned is doing a DIY Syclone build right now, too
@@jonathanschubert9052 I didn't know about him until now. They seem like cool cats too! Thank you!!!
Who’s Jimbo?
@@gregpallett1839 the hosts name.
Sundays are for church and Robot Cantina...Love the content!
Your matchbox car on a treadmill DID fool me........I thought it was an RC car....... so props for that.
Thanks Jimbo! Sounding pretty good. I'm sure the neighbours will be happy when you put a muffler on the car. Fix the reverse gear already!
The way is sounds is just amazing!
If you're interested in speed parts for the 670 you should check out performance 670, they have billet rods, cams, valve springs, and other kind of parts to hop these engines up
I remember being taught how to make a new gasket using a Corn Flakes box and a ball-peen hammer! I've done it a few times; it's crude, but efficient!
Maybe some sound-deadening insulation in the engine compartment, too??
Cruising at 55 with a lawn mower engine driving it is impressive. I need a project like that to play with.
It’s so much fun to listen to your words and to watch the changes and the progress. And sometimes I do learn some new vocabulary. I’m looking forward to the next update! See you - Martin
In your own style..... 0 - 60? Not to shabby! 🤔🧐👋🤗🤗🤗
What a well-done video! Great clear photography and narration as to what you're doing at each step. First video I've seen of yours, but I'll be back.
Good to see you back on the road. As for the noise? I bet your neighbours loved you in the morning!
Really enjoy your videos. I like the modify and test method. Thanks. Looking forward to the next episode.
Jimbo, keep up the good work. This channel is awesome and I always get excited to see what your up to! You have the most unique projects on UA-cam!
Faster and whisper quiet! Something you love to drive on country roads.
The Garden Gnomes are sleeping in the shade.
Harley guy here, equal length exhaust is less important with a 2 into 1 system, especially with a lower output engine. 2 into 1 will let the backpressure equalize at the collector.. It becomes a lot more important for dual exhaust.
Thanks for the input! I'm taking a beating from all the "experts" saying the exhaust is bad. ... It ain't great, but it's a lot better than the stock exhaust and that's what matters to me.
@@robotcantina8957 unequal length headers will affect "peak" power on a high output engine, but unequal length headers actually broaden the power band slightly, which I think is more desireable in your application. One possible side effect of differing lengths is a lower cylinder temp in the side with the longer pipe. (more technical than I was going to get, but let the nay sayers look it up :) )
Love the videos. Can’t wait for the next video. Got a whole nother week. Good thing I work every day all day. Hahah thanks for the videos makes me wanna do this stuff. Keep it up.
Lol it sounds like the Harley from Terminator 2, awesome
A couple of clips under the bracket and it will hold a spare belt captured in the shaft assembly . When she fails unclip and run it on
Someone else mentioned this and its a great idea! we will certainly give it a try.
I enjoy these videos as you develop the ideas..
Gasket paper and a small round headed hammer and you could have made a gasket in half an hour, using the hammer against the metal of the side cover as a cutter. I often make carburettor float chamber gaskets this way as it's a same day fix rather than waiting for a new part.
I dont notice much difference in power between 11:1 and 12.5:1 AFR on an aircooled VW bus.. just more soot , worse mileage and maybe the AFR sensor lasts only 20k miles..
Your muffler bushings were the perfect opportunity to cover why you didn't go with muffler bearings :P
Prolly because the bearing grease smokes when it gets hot. :)
If you want more power, and if I were you, I'd get in touch with performance 670. In combination with what people are saying regarding a snowmobile torque converter from cars and cameras, they're pushing a 670 to 50-plus horsepower (before they turbo-methonal'd it, which I believe they're rocking almost 70 horses).
Well worth the wait for a missed sunday episode posting, keep on keeping on 🤘
Missed you last week, hope all is well. Glad to see you back! 😊
Have you heard of mufflers? An expression in HD circles I think is like: "Loud pipes saves lives" but should be supplemented with "Loud pipes make neighbors angry"
Nice movie.
Even with the obnoxiously loud exhaust, it'll never sound like a Harley. That is because the Predator engine is a 90 degree V-twin, and the Harley is a 45 degree engine, with a weird firing timing. It should sound more like a Moto Guzzi instead.
I’m so very happy the bucking has stopped and the CVT bites hard!! She even leans back when accelerating hard!! Keep up the awesome work and I’m loving this build. Ooh plus if you want to see some inspiration for the predator v-twin engine, take a look at cars and cameras classic drag rail car!! They may have some idea to make that engine rip!!
DAAAAHAHAHAHAAAM THAT'S LOUD! Bet your neighbours LOVE YOU! 🤔🤣🤣 Good idea for bolt on a 'slip on' end can from 600cc Motorcycle, some also have a quick removable baffle. It'd give a nice deeper note too 🤔😉
😎🇬🇧
When you brought up why you don't use a thrust-type clutch like in a regular automotive drivetrain, I'm reminded that for some reason nobody makes stand-alone clutch setups. I would be willing to pay money for a stand-alone automotive type clutch that could have a pulley and/or gear on one end and the same on the other.
What an amazingly unexpected noise to be coming from an old Renault! I love this
This thing sounds super pissed off, good job.
Perhaps, at this point, it would be wisest to fabricate an adapter mount to the intake manifold for a carburetor with an accelerator pump... such as a Holley 350-cfm or 5200-series progressive 2-barrel.
This. A progressive linkage Holy Weber would be ideal. They were stock on Vegas and Pintos but I'm almost positive the Fiat 850 Spyder my wife had had one and it was only an 850cc motor.
@@johndoe-om6yl Yes, I agree... as my Chevette also had one. (Listed as the Holley "5200" series) Even a Carter BBD would suffice, and perhaps be a better fit because of it's smaller flange/throttle-body area. But then, I think even adapting a Rochester Model 500 1-bbl TBI unit would certainly be the way to go, given that it's closed-loop operation is no different than that of any EFI system the OP has dallied with before, and how he's already installed an EGOS (Exhaust Gas Oxygen Sensor) the output of which is relatively easy to adapt to any rudimentary GM/Bosch management system... such as the one found on my '85 Chevette w/feedback loop Holley "5200".
Your belt and clutch life will be extended significantly if you get in the habit of using 1st gear....even though you don't 'need' it.
For a gasket, go to your pantry and find breakfast cereal. Use the box to make a gasket.
You will never duplicate the sound of a Harley Davidson. I think Harley Davidson might have a patent for the sound that they make. The sound Harley's make is cuz the engine block with the cylinders being at 45° which makes the firing the second cylinder fire 315° later. So no other bike will sound exactly like a Harley. But if you could get a custom ground camshaft and had another tiny lobe on the exhaust, at the right degree, used like a compression release, like on a Tecumseh 3hp, it would sound a little bit more like a Harley at idle.
What would be really cool is, if you could make reverse work of course, but some sort of heater is a must, and maybe even some AC if at all possible, otherwise, it's not really a usable car, great video, and thanks for sharing.