Every time you said 99’s I could hear Mr. Sam in the back of my head saying “ 99’s! that’s an 1/8th of an inch!” Really great reference to another great person. I love it when you two are just chatting about everything. Riding around in that truck with 700,000 miles on it. 😂
Not really that big of science product. Is all about making the carb think is lives under boost as well as supply fuel. Learn what it needs one piston at a time.... we did this in the 70's when no EFI was possible.. We also built mechanical fuel injection to work with turbos.. Is all a lot of fun when you peel open the float bowls and find floats smashed flat... It really is the most responsive and best way to go but it is fraught with headaches... EFI made it stupid simple.. What is sad is some of the "facts" being put out. A certain tuber promotes high compression pistons (not a good idea).. That water/methanol makes power (it is used to prevent detonation, not make hp) What I love about Steve is that he learns as he goes and is not bashful about being wrong.. I have wronged a lot of engine parts over the years but each busted part is a le$$on... :)
@@randalljames1 I have been taught that air or oxygen and fuel burn, but water does not burn. If a percentage of the flow going into the engine is water, then there is less space for what makes that explosion and power. As a person with an open mind, the only way water would help is if the loss of that fuel mix volume cooled so much that the engine could make more power than what the lost air/fuel mix would account for. I'm guessing it isn't going to happen and it is better to control the heat through other methods such as not making excess heat in the first place.
@@joelg6740 Yes, I forgot about that, but have experience with it. water plus lead=tinsel fairy. It is fine when it hits the surface of molten lead, but let it go under and it blows. So, does the steam help make more power or is it purely just cooling?
You lose power even though the water turns to vapor extracting heat it still doesn't have the expansion energy as fuel so it drops in power because of sharing displacement with fuel, and air, but it keep parts down lower in temps from reaching critical melt temperatures so you can spin engines to higher RPM where you can make exponential more power where boost fixes everything. Power.
Steve referencing SpongeBob is hilarious to me. Im 30 years old and never really watched spongebob even as a kid so hearing a grown man old enough to be my father reference it is hilarious.
@@jdias51 I haven't watched it in probably ten years but when I did I would be entertained watching it one night and then the next time i would be thinking wtf am I watching lol. I was just surprised that Steve is a SpongeBob fan.
Agree I'm 34 never really watched it but I specifically remember seeing that episode when my son had it on TV one day it is hilarious hearing him use reference to SpongeBob
Just a little Joule - Thomson action going on there. Whenever you have a gas mixture go from one chamber of high temperature and pressure to another chamber of lower temperature and/or pressure, there will be adiabatic expansion causing condensation. This is just a case of a gas mixture going from a chamber of about 44psi @ ~100degF to a chamber of about 14psi @ 70degF. The change in pressure alone caused all of the water molecules in the gas mixture to condensate. This is actually a common process in most hvac systems. Putting a blow off valve on the cold side of the intercooler will also cause this type of behavior and it's even more of an issue as relative humidity increases.
Correct… if you took the air in that dyno room and used a compressor to put it in a tank at 30 PSI, let it cool a little to remove some of the heat from compression (simulating the intercooler), and then suddenly vented it to atmospheric pressure, it would instantly cool far below room temperature and any remaining vapor in the compressed air would turn to mist.
I do work with gas and liquid analysis for chemical plants and refineries and have to take the Joules-Thompson effect into account all the time. Especially with analytics that have components that either boil or condensate depending on it's state What's also pretty cool is that almost all gases go cooler as the flash from the drop in pressure. Except Helium and Hydrogen, they actual increase pressure. Which can actually lead to hydrogen fires in plants that uses that under high pressure and get leaks. What's dangerous is that Hydrogen burns without a visible flame too But seeing the effect of the pressure flashing like in the video is really cool. There are also so many interesting discussions about how quickle temperature drops in a gas, because of how badly it transfers heat. I really liked your explanation 🙂
I had a 1980 Ford Mustang with a 2.3 l 4-cylinder Turbo but it had a draw through carb'd setup. I loved that car, and I learned all the carburetor stuff that you're talking about now and it's been so long since I learned it that it's just really awesome to hear it again.. kind of useless information because it's very rare to see those setups anymore.
@@xbear7473 I have never seen a 4-cylinder with that power. Best I saw was when the boostedboiz got 1300 horsepower to the wheels in their MR2 with a K20 4 cylinder.
Every time it blows (geysers) its a steam expansion / explosion. When it draws in extra water it flashes extra large with potentially disastrous results. A few gallons more I suspect is all it takes. Happens every few years they report. It is really too dangerous to allow people that close.
Cold air moisture, but you're also getting a bunch of instantaneous pressure drop which also lowers the temperature which basically makes a cloud. It's like cracking the cap on a 2 liter of pop when it's hot out, if you crack it just right it dumps the pressure, but you'll see a little grey cloud in there swirling around for a few seconds until it warms back up. Here you had a couple hundred liters of pressurized moist air rapidly cooling down. PV=nRT works!
Dew Point. The temperature when the moisture in the air condenses. Droplets on the outside of a cold can on a warm day. When the charge tube blew off, is what it would look like in an AC system when the high side goes through an orifice tube to low side. We saw the mist due to a rapid drop in pressure. The air would have been colder than ambient air temperature in the room.
Always wanted a good explanation of how blow through carbs worked. And to see a 20 year old version that you built still running.... bloody awesome!!!! You should be very proud!
Those fuel leaker days..... don't miss the fuel on my fingers all the time LOL Those jet extensions on the rear, I did that once and it ended up needing a lot more jet to work. Put the jet back in the block, and a slip over (copper tube) extension and was able to take a lot of jet away. Was wild.
compressed air always has lots of water in it. The water doesn't compress with the air and settles in the tubing. That is why you must drain the air tank on an air compressor regularly, especially in high-humidity climates.
The simplicity of carburetors is just so darned elegant. All that control with no external power, just direct the pressure differentials to the right places, through the right restrictions (jets) and applied against the correct springs… and it WORKS. No matter how much I like EFI, I’ll always have at least a couple of good old carbureted vehicles around.
That was a great explanation on how the Holley works. I used to run vacuum secondaries, and I always had a jet kit and a spring kit. I knew the nomenclature of the parts in the carburetor, but I did not know the specifics of everything. I did know how to tune it to make it go fast but I did not have any turbos or superchargers on any of my engines. Thanks Steve!
STEVE as usual another great video mate. There are so many younger people who only have experience with EFI, they never grew up with or learnt the intricacies of carburettors and how they wrok with vacuum and airflow through tiny passages. Back in the 70-80s I had a 4cyl with twin DCOE Webers and that was as close to fuel injection as you could get for the street, of course we had mechanical injection for race cars. But nothing EFI, my first experience with that was CFI on Ford Falcons here in Australia, and you also had the Bendix injection from Europe. Keep up the great work and hopefully we will soon see the exit of the Right Royal PITA Hemi.
I’m with the old school guys on carbs simpler and functional than computers. But I like Mr. Morris’ explanation of their limitations, and I agree. Otherwise we wouldn’t need or use efi and computers and infinitely variable ignition.
Thank you for going through this! I had always wondered how carburetor setups for forced induction worked, seeing it explained by you it makes sense with your comparison to a boost referenced fuel pressure regulator.
Love the carburetor and a distributor. Young kids don’t even know what points are.. We carried a file in the tool bag to clean the points. That was a tuneup.. In 1961 I had a 348/280hp hyd lifters with 3 two barrels 4sp chevy. Simple simple simple…. Thank you for sharing.
I really appreciate you always taking the time to teach us regardless of how popular it is...the carb blow through system was awesome to see and have you break it down.
Tip There’s an issue with some Holley type carbs that if you’re unaware of can drive you nuts. The issue is that after a time of use the gaskets in the metering blocks swell into the channels partially blocking them off. It can also be intermittent and or progressive depending on throttle position. A temporary solution is to shave the gasket in the channel areas thinning it out so it causes less restriction. Using two gaskets with shim stock between and completely cutting out the channel area on one is a more permanent solution.
I don't think it's as bad an issue or maybe not at all with the blue reusable gaskets. now the other gasket type do all sorts of bad things, especially if allowed to sit dry of fuel. I have seen the cork and other composite type completely pulled in over passage holes, crossed passages or even so far the bowl was not sealed at all anymore. old power valves so stiff they don't work hardly or stick open/closed and of course the accelerator pump diaphragm. old enough to have learned and rebuilt piles and piles of carburetors and you know how that works, rebuild a few then everyone, their brothers, sisters and neighbors come running with them. distributors, points and all ignition types too, lets give alternators/generators a mention also. 😑
@@throttlebottle5906 I haven’t touched a carby in so long the last one now has grand kiddies, so improved gasket technology should have come along long ago. I vaguely remember there being a rubberised aluminium gasket similar to an LS oil pan gasket being developed to counter the issue I described but that was long after I gave up on carbureted vehicles
I know enough to build carbs, from mistakes I made over the years. Im a tech and have done more carburetor work in the last two years than I did for myself or professionally in 37 years. Working on older stuff, and not knowing about the higher end blow thru designs is very ENLIGHTENING! DUAL floats & trick power valves that goes with it. Good Video & educational! Take care!
Steve, Compressing air forces water to condense out of the air. That is why we have to drain our air compressor tanks. I think your ice water inter cooler was a big part of it and the boost level contributed to it also (water in the tube). I'm sure it is as humid in MI as it is in WI this time of year.
I'm a automotive/atv/snowmobile mechanic going on 20 years working at my family owned business and never really had the opportunity to work on automotive carburetors my dad always does that😅😅 i try to watch and learn when i can
The rapid change in pressure also causes an instantaneous temperature drop. If it went from 30 psi of boost (44.7 psi absolute, psia) to atmospheric pressure, 14.7 psia, that's a pretty big drop over a very short period of time. Think of an orifice tube or expansion valve in an AC system. The tube upstream of the orifice is usually warm, and immediately after it's cold to the touch (and sweating if it's humid outside).
Love the education and refresher info about carbs etc, Like seeing the variety of setups and their limitations. Thanks for sharing. Best engine building info channel around IMO.
Was so impressed with Holley carbs. Except for a rare particle of sand in a port, just worked. Few jets in the 72-80 range, fuel mixture was handled. Carb was used in the sand dunes with lots of float bounce, no bounce floods, like other brands of carbs.
In dirt super late model racing alot of them now use what's called a super bowl carburetor. It's a float-less design that just keeps the bowl topped off by the fuel pump and has a return line to the tank for excess fuel. Pretty neat deal, a company named Willy's makes a kit for several different carbs
what is interesting is that with the boosted air under pressure that moisture would never be seen, just the rapid expansion of the hose blowing off is what condensated the moisture out. There is a few BHP in that moisture too. If you were to feed air from a dry air source or say sealed then filled that dyno room with dried air do you think you would see less horsepower?
As always I am entertained and taught that I have forgotten everything that I once knew! Steve you are so sharp, I am an old dude with a very old broken brain! Keep cranking!
I had a Spearco air to water on my supra in the mid 90's that started doing the same thing. The intercooler core had a leak. The plugs are getting steam cleaned. It would suck water into the intercooler at idle then as boost came on it would blow into intake stumbling until it cleared up. I had an old Accell DFI pro sequential on it that I bought from Lawrence Conley who had it on Tweeked his buick grand national. Fun times!
Correct me if I'm wrong but the condensation explosion is because the room-temperature-ish compressed charge escapes & rapidly loses pressure, due to ideal gas law this means that the charge's temperature must also rapidly drop and so the de-pressurized charge is actually colder not only than the surroundings but also the intercooler, that's why the amount of water is so high and since it's on a molecular level the condensation is insanely fast.-forming. For those who don't know Ideal gas law basically states that for a given amount of change in gas pressure there is a linear change in gas temperature, that's why any kind of forced induction greatly increases the temperature of the charge and the higher boost the higher the change, that is also what happens in the cylinder & why compression-ignition works so well.
Years ago was involved in racing group A starlets. Two good drivers, very competitive and built and serviced out of same workshop. There was one corner at teretonga in nz that is fast and does about 150 deg. We could not get one car to stay on power as it surged fuel. Carbs were identical. Turns out the craft driver of the other car had put a higher capacity cam operated fuel pump from a bigger engined Toyota on his and never said a word! It wasn't cheating but was crafty.
Mr. Steve Morris it is very helpful that you showed us that carburetor blow through there’s a Lotta new guys getting into the Hobby so it’s very helpful great video keep up all the good videos man God bless you and your family
Pro tip for getting super close up with a telefocal lens without losing focus. Zoom all the way out (wide angle) and move the camera right up to the subject instead of trying to keep the camera back and zooming in.
The intercooler dropped the air temp below the dew point of the water. Also, the inlet tube coming off allowed a drop in air pressure to near atmospheric which also causes a big drop in temp - like what an expansion valve in an air conditioner.
Cool. I don't know if it's relevant with the US carbies, but there were some cabs with thin-walled brass floats, and they would collapse with even mild boost, causing the float's needle valves to fully open and flood the engine. With the float design used there, some would paint then with a fuel resistant varnish, as some would otherwise absorb fuel under boost pressures, which also caused the engines to run rich.
Rebuilding and tuning carbs is a lost art on large engines. Hell even small engines are injected nowadays... or sealed, like on lawn mowers. My Grandfather taught me 50 years ago how to do it. Used his brass screwdrivers that he had threatened us with a beating if we touched them. I bought a great car for a 150 bucks because thats what the dealer would give the guy for it as a trade-in. Rebuilt the carb - had a loose midplate, thus a huge vacuum leak. Rebuild kit was like $12. Changed plugs, wires, cap and rotor. Less than a 100 bucks all in. That slant 6 ran great till i stupidly sold it to go to college. Dealer really wanted to rip him off - he knew it just needed a tune up. Cars needed them every 5 to 10 thousand miles back then at maximum. Maybe 3k for older cars. My Chevy Luv truck had dual points and ate them up so often i could set them roadside with a pulltab off a beer can. That was the old days. Cars were a pain in the ass back then.
I had to cobble a Ford truck together. One time just to have a vehicle to drive. It was a 95 Ford extended cab. Pick up or put a 4 barrel intake on it and a point's Ignition distributor the throtel cable was so long. The only way I could get it to work was to put the card on backwards. With a adapter plate.
Did a quick Google search to make sure I was not going to make a open mouth insert foot comment but I was going to say 120+ years since the carburetor was invented(thinking 1904ish) and turns out it was 1886 so 158 year old tech is what you were working with! That is absolutely amazing!
As a youger dude, its cool to see you so comfortable with a carb. Wish I had a reason to get the experience, but laptops are so easy! Enjoyable video seeing the magic air box do magic things.
I remember a 7th grade science lesson on air. When compressed air is suddenly released the moisture in it will condense into a cloud. That’s why you need a water filter on all air compressors, especially when using it on a paint gun.
Since subscribing to this channel after watching Cleetus video. Been going back and watching videos realizing how little I thought I knew. But absolutely enjoy watching them. Thanks professor Steve!
Every time you said 99’s I could hear Mr. Sam in the back of my head saying “ 99’s! that’s an 1/8th of an inch!” Really great reference to another great person. I love it when you two are just chatting about everything. Riding around in that truck with 700,000 miles on it. 😂
So cool to see something you built 20 years ago still running like a champ.
Awesome to hear Kyle talking about Steve knowing exactly what was wrong from the other room.
water dont burn
these videos make me gomnna sleep sooner
It's pretty cool to see the little bit of older tech with the blow through carburators. Whoever engineered those carbs is a genius. So complicated.
Not really that big of science product. Is all about making the carb think is lives under boost as well as supply fuel. Learn what it needs one piston at a time.... we did this in the 70's when no EFI was possible.. We also built mechanical fuel injection to work with turbos.. Is all a lot of fun when you peel open the float bowls and find floats smashed flat... It really is the most responsive and best way to go but it is fraught with headaches... EFI made it stupid simple.. What is sad is some of the "facts" being put out. A certain tuber promotes high compression pistons (not a good idea).. That water/methanol makes power (it is used to prevent detonation, not make hp) What I love about Steve is that he learns as he goes and is not bashful about being wrong.. I have wronged a lot of engine parts over the years but each busted part is a le$$on... :)
@@randalljames1 I have been taught that air or oxygen and fuel burn, but water does not burn. If a percentage of the flow going into the engine is water, then there is less space for what makes that explosion and power. As a person with an open mind, the only way water would help is if the loss of that fuel mix volume cooled so much that the engine could make more power than what the lost air/fuel mix would account for. I'm guessing it isn't going to happen and it is better to control the heat through other methods such as not making excess heat in the first place.
The thing is water turns to steam at 1600x original volume @@CGT80
@@joelg6740 Yes, I forgot about that, but have experience with it. water plus lead=tinsel fairy. It is fine when it hits the surface of molten lead, but let it go under and it blows. So, does the steam help make more power or is it purely just cooling?
You lose power even though the water turns to vapor extracting heat it still doesn't have the expansion energy as fuel so it drops in power because of sharing displacement with fuel, and air, but it keep parts down lower in temps from reaching critical melt temperatures so you can spin engines to higher RPM where you can make exponential more power where boost fixes everything. Power.
THE TECHNICAL CARBURETOR LESSON WAS EXCELLENT! WE NEED MORE TECHNICAL CAMERA CONTENT ❤️
Makes 1792 horsepower “so that thing still runs like crap”
😂😂😂 he’s got high standards. It’s a good thing.
Yep, knows what it should make and wasn't singing right.
He said 27 PSI of boost. Any big block chevy making 27 pounds should be making 2000hp or 2200.
@IkePegsMarth Hahahah. Came here to say it.
I was like "Oh sweet, that's way better."
Steve: *disappointed dad face*
99!!!!! sam's gonna have a love this
Steve referencing SpongeBob is hilarious to me. Im 30 years old and never really watched spongebob even as a kid so hearing a grown man old enough to be my father reference it is hilarious.
Probably watching it with Kyle. My kid had that show on constantly, lol
SpongeBob is hilarious even as a adult to be honest
@@jdias51 I haven't watched it in probably ten years but when I did I would be entertained watching it one night and then the next time i would be thinking wtf am I watching lol. I was just surprised that Steve is a SpongeBob fan.
I'm 47 and my kid loved it, so I had to love it. But it's great, you're missing out
Agree I'm 34 never really watched it but I specifically remember seeing that episode when my son had it on TV one day it is hilarious hearing him use reference to SpongeBob
Just a little Joule - Thomson action going on there. Whenever you have a gas mixture go from one chamber of high temperature and pressure to another chamber of lower temperature and/or pressure, there will be adiabatic expansion causing condensation. This is just a case of a gas mixture going from a chamber of about 44psi @ ~100degF to a chamber of about 14psi @ 70degF. The change in pressure alone caused all of the water molecules in the gas mixture to condensate. This is actually a common process in most hvac systems.
Putting a blow off valve on the cold side of the intercooler will also cause this type of behavior and it's even more of an issue as relative humidity increases.
Yep. Some good pressure differential right there.
Correct… if you took the air in that dyno room and used a compressor to put it in a tank at 30 PSI, let it cool a little to remove some of the heat from compression (simulating the intercooler), and then suddenly vented it to atmospheric pressure, it would instantly cool far below room temperature and any remaining vapor in the compressed air would turn to mist.
I do work with gas and liquid analysis for chemical plants and refineries and have to take the Joules-Thompson effect into account all the time. Especially with analytics that have components that either boil or condensate depending on it's state
What's also pretty cool is that almost all gases go cooler as the flash from the drop in pressure.
Except Helium and Hydrogen, they actual increase pressure.
Which can actually lead to hydrogen fires in plants that uses that under high pressure and get leaks.
What's dangerous is that Hydrogen burns without a visible flame too
But seeing the effect of the pressure flashing like in the video is really cool.
There are also so many interesting discussions about how quickle temperature drops in a gas, because of how badly it transfers heat.
I really liked your explanation 🙂
Saw the front pipe slip in the first pull. didn't come off, but it definitely moved a bit.😊
I had a 1980 Ford Mustang with a 2.3 l 4-cylinder Turbo but it had a draw through carb'd setup. I loved that car, and I learned all the carburetor stuff that you're talking about now and it's been so long since I learned it that it's just really awesome to hear it again.. kind of useless information because it's very rare to see those setups anymore.
2000 hp?
@@xbear7473 I have never seen a 4-cylinder with that power. Best I saw was when the boostedboiz got 1300 horsepower to the wheels in their MR2 with a K20 4 cylinder.
The sick joke of life is that those of us who still understand carbs can’t read the jets!
How true ! Just pulled the magnifying glass out last week to re- jet my son’s motorbike. 57 years old blind and deaf 😂
lol. True
Ouch ... spot on!
Isn't that what the zoom function on smart 'phones for?
There are a few of us that have learned carb tuning I can't read spark plugs through I need my afr gage
Fun fact: water expands 1,600 times its volume when it flashes to steam. 1 liter of water makes 1,600 liters of steam.
And that is why the yellowstone geyser exploded not too long ago, steam explosion
Every time it blows (geysers) its a steam expansion / explosion. When it draws in extra water it flashes extra large with potentially disastrous results. A few gallons more I suspect is all it takes. Happens every few years they report. It is really too dangerous to allow people that close.
@@ironwolf2386it blows on a regular basis you can set your watch to it up until the other day
That is a fun fact. No wonder it makes efficient power.
WATER POWERED CARS, anyone??
you look super happy working on a carb :-) Im 57 and worked on many... stoked to see it
The old man garage is gonna love this video! This was a good one for what’s left of the carb guys. You make it seem simple, which I guess it is.
I thought it was "Exploding Wader"?!?!
I love your constant education on how cool everything is and how/why it works!
Thank you Professor Morris for another ton of information.
Ive been saving a long time for a Steve Morris original. Today I can place my order for one lg Tshirt
Cold air moisture, but you're also getting a bunch of instantaneous pressure drop which also lowers the temperature which basically makes a cloud. It's like cracking the cap on a 2 liter of pop when it's hot out, if you crack it just right it dumps the pressure, but you'll see a little grey cloud in there swirling around for a few seconds until it warms back up. Here you had a couple hundred liters of pressurized moist air rapidly cooling down.
PV=nRT works!
Dang it. I learned something again. This old dog is still learning. Bet you flinched 😮. Lexan or not
Cleet says, "It need's 99's! dang we only got one!"
Thank you Steve for sharing your knowledge and making it possible to view. It takes alot of time to make videos really appreciate you and your staff
I know across the country, Mr Sam's ears perked up when you said 99 jets
Really shows your skills and knowledge and pride in engine building. The fact it’s been raced every year for 20 years and still puts down 2000 horses
Dew Point. The temperature when the moisture in the air condenses. Droplets on the outside of a cold can on a warm day. When the charge tube blew off, is what it would look like in an AC system when the high side goes through an orifice tube to low side. We saw the mist due to a rapid drop in pressure. The air would have been colder than ambient air temperature in the room.
Yep, rapid pressure loss.
Always wanted a good explanation of how blow through carbs worked. And to see a 20 year old version that you built still running.... bloody awesome!!!! You should be very proud!
Those fuel leaker days..... don't miss the fuel on my fingers all the time LOL Those jet extensions on the rear, I did that once and it ended up needing a lot more jet to work. Put the jet back in the block, and a slip over (copper tube) extension and was able to take a lot of jet away. Was wild.
Love the blow through carb detail, thanks for rambling along on it.
Glad everyone's ok.🤪
In the 70’s I did some performance carburetor work. Holly was popular and my favorite for its tune-ability . We did our timing curves with springs.
I can relate Been there , done that..
Love your "class" it's always interesting and informative.
compressed air always has lots of water in it. The water doesn't compress with the air and settles in the tubing. That is why you must drain the air tank on an air compressor regularly, especially in high-humidity climates.
The simplicity of carburetors is just so darned elegant. All that control with no external power, just direct the pressure differentials to the right places, through the right restrictions (jets) and applied against the correct springs… and it WORKS. No matter how much I like EFI, I’ll always have at least a couple of good old carbureted vehicles around.
That was a great explanation on how the Holley works. I used to run vacuum secondaries, and I always had a jet kit and a spring kit. I knew the nomenclature of the parts in the carburetor, but I did not know the specifics of everything. I did know how to tune it to make it go fast but I did not have any turbos or superchargers on any of my engines. Thanks Steve!
STEVE as usual another great video mate. There are so many younger people who only have experience with EFI, they never grew up with or learnt the intricacies of carburettors and how they wrok with vacuum and airflow through tiny passages.
Back in the 70-80s I had a 4cyl with twin DCOE Webers and that was as close to fuel injection as you could get for the street, of course we had mechanical injection for race cars. But nothing EFI, my first experience with that was CFI on Ford Falcons here in Australia, and you also had the Bendix injection from Europe.
Keep up the great work and hopefully we will soon see the exit of the Right Royal PITA Hemi.
I’m with the old school guys on carbs simpler and functional than computers. But I like Mr. Morris’ explanation of their limitations, and I agree. Otherwise we wouldn’t need or use efi and computers and infinitely variable ignition.
Thank you for going through this! I had always wondered how carburetor setups for forced induction worked, seeing it explained by you it makes sense with your comparison to a boost referenced fuel pressure regulator.
Love the carburetor and a distributor. Young kids don’t even know what points are.. We carried a file in the tool bag to clean the points. That was a tuneup.. In 1961 I had a 348/280hp hyd lifters with 3 two barrels 4sp chevy. Simple simple simple…. Thank you for sharing.
So true.
Damn awesome seeing some local big island builds upgrading!!! ❤
Hey Steve, thanks for the layers of insights! I love when you take us down the rabbit hole with you!
13:50 - Drill the 98 out to a 99 😂 “Slap some 99’s in there” - Queue Sam shaking his head
I really appreciate you always taking the time to teach us regardless of how popular it is...the carb blow through system was awesome to see and have you break it down.
Your managing alot of energy in there Steve, if it cant get to you it wont hurt you. Stay outta there!(like youve been doing i mean!l your the man !)
That was exciting! As Always, May God Bless you and yours! 😇
Thank you for explaining the carburetor stuff I’m super interested in it and I’ll watch it every single time
Watching the whole video, I guess I’m wrong. You’re both fuel injection guy and the carburetor guy. 😂
Tip
There’s an issue with some Holley type carbs that if you’re unaware of can drive you nuts.
The issue is that after a time of use the gaskets in the metering blocks swell into the channels partially blocking them off.
It can also be intermittent and or progressive depending on throttle position.
A temporary solution is to shave the gasket in the channel areas thinning it out so it causes less restriction.
Using two gaskets with shim stock between and completely cutting out the channel area on one is a more permanent solution.
I don't think it's as bad an issue or maybe not at all with the blue reusable gaskets. now the other gasket type do all sorts of bad things, especially if allowed to sit dry of fuel.
I have seen the cork and other composite type completely pulled in over passage holes, crossed passages or even so far the bowl was not sealed at all anymore. old power valves so stiff they don't work hardly or stick open/closed and of course the accelerator pump diaphragm. old enough to have learned and rebuilt piles and piles of carburetors and you know how that works, rebuild a few then everyone, their brothers, sisters and neighbors come running with them. distributors, points and all ignition types too, lets give alternators/generators a mention also. 😑
@@throttlebottle5906 I haven’t touched a carby in so long the last one now has grand kiddies, so improved gasket technology should have come along long ago.
I vaguely remember there being a rubberised aluminium gasket similar to an LS oil pan gasket being developed to counter the issue I described but that was long after I gave up on carbureted vehicles
FYI, I don't know if you noticed but at about 4:23 the front tube shifted to the left as you are looking at the motor.
NOW you speaking my language! 😂 Carbs, I get. Lovely to see how proud Kyle is of the Ol' man there. 😊 Nice
I know enough to build carbs, from mistakes I made over the years. Im a tech and have done more carburetor work in the last two years than I did for myself or professionally in 37 years. Working on older stuff, and not knowing about the higher end blow thru designs is very ENLIGHTENING! DUAL floats & trick power valves that goes with it. Good Video & educational! Take care!
Hawaii has terrible DA considering the altitude. Too much water in the air, and it gets hot.
Condensation yes but could also be the manifold backdrafting through the carb and pulling more fuel out.
Carbs work in reverse.
Steve, Compressing air forces water to condense out of the air. That is why we have to drain our air compressor tanks. I think your ice water inter cooler was a big part of it and the boost level contributed to it also (water in the tube). I'm sure it is as humid in MI as it is in WI this time of year.
Yep I did learn something Spark plugs are sometimes called jets .Love your show Steve and Kyle is one lucky man working with his Dad
Thanks for relating the carb tuning to standard EFI lingo!
Great vid Steve! I’m wearing the Steve-ism’s shirt at work tonight! LOL!!!
I'm a automotive/atv/snowmobile mechanic going on 20 years working at my family owned business and never really had the opportunity to work on automotive carburetors my dad always does that😅😅 i try to watch and learn when i can
The rapid change in pressure also causes an instantaneous temperature drop. If it went from 30 psi of boost (44.7 psi absolute, psia) to atmospheric pressure, 14.7 psia, that's a pretty big drop over a very short period of time. Think of an orifice tube or expansion valve in an AC system. The tube upstream of the orifice is usually warm, and immediately after it's cold to the touch (and sweating if it's humid outside).
Love the education and refresher info about carbs etc, Like seeing the variety of setups and their limitations. Thanks for sharing. Best engine building info channel around IMO.
Like the smile on your face while working with the carb and jets.
In terms I can remember as a compressor teck.. every degree you drop in temp thru your cooler the air can hold half as much moisture
Thanks for the old memories Steve 💪🏼😎have a great week boy's racing time boys
Was so impressed with Holley carbs. Except for a rare particle of sand in a port, just worked. Few jets in the 72-80 range, fuel mixture was handled. Carb was used in the sand dunes with lots of float bounce, no bounce floods, like other brands of carbs.
This is by far my favorite channel over all of the car channels.
The floats work just like the toilet bowl😊
Corn cob had them 99 in it 😂
These are great learning videos for me. Thanks for sharing Steve and everyone involved.
Love the going backwards 5% out reference, spot on!
Great video I always learned so much from you and the condensation blowing out of the pipe was so cool
Great video and tech tips. I have carbs on a Roots blower , so I like carburetor info. Many thanks.
In dirt super late model racing alot of them now use what's called a super bowl carburetor. It's a float-less design that just keeps the bowl topped off by the fuel pump and has a return line to the tank for excess fuel. Pretty neat deal, a company named Willy's makes a kit for several different carbs
Great video. The extended main jet tubes were fascinating.
We're diggin the carb lingo, turned into efi terms. We learned a lot. Need more of that!!
what is interesting is that with the boosted air under pressure that moisture would never be seen, just the rapid expansion of the hose blowing off is what condensated the moisture out. There is a few BHP in that moisture too. If you were to feed air from a dry air source or say sealed then filled that dyno room with dried air do you think you would see less horsepower?
I learned more about blow through carbs in this video than all literature.
Thanks
Mikel
As always I am entertained and taught that I have forgotten everything that I once knew! Steve you are so sharp, I am an old dude with a very old broken brain! Keep cranking!
4:00 Kyle looks like Princess Leia with his ear protection on the sides of his head....😂
Its hard to keep a Morris down, I've never seen a guy take adversity head on with a smile like Steve does. He's amazing.
I had a Spearco air to water on my supra in the mid 90's that started doing the same thing. The intercooler core had a leak. The plugs are getting steam cleaned. It would suck water into the intercooler at idle then as boost came on it would blow into intake stumbling until it cleared up. I had an old Accell DFI pro sequential on it that I bought from Lawrence Conley who had it on Tweeked his buick grand national. Fun times!
Thank you Steve and Kyle for everything that you do! I appreciate all of the awesome content! Stay awesome guys!
May God bless the Morris family!:)
Correct me if I'm wrong but the condensation explosion is because the room-temperature-ish compressed charge escapes & rapidly loses pressure, due to ideal gas law this means that the charge's temperature must also rapidly drop and so the de-pressurized charge is actually colder not only than the surroundings but also the intercooler, that's why the amount of water is so high and since it's on a molecular level the condensation is insanely fast.-forming.
For those who don't know Ideal gas law basically states that for a given amount of change in gas pressure there is a linear change in gas temperature, that's why any kind of forced induction greatly increases the temperature of the charge and the higher boost the higher the change, that is also what happens in the cylinder & why compression-ignition works so well.
Good info and fantastic vibe / atmosphere in this video.
That's a boat load of power valve "jet" holes!!!!
Years ago was involved in racing group A starlets. Two good drivers, very competitive and built and serviced out of same workshop. There was one corner at teretonga in nz that is fast and does about 150 deg. We could not get one car to stay on power as it surged fuel. Carbs were identical. Turns out the craft driver of the other car had put a higher capacity cam operated fuel pump from a bigger engined Toyota on his and never said a word! It wasn't cheating but was crafty.
Mr. Steve Morris it is very helpful that you showed us that carburetor blow through there’s a Lotta new guys getting into the Hobby so it’s very helpful great video keep up all the good videos man God bless you and your family
That intake elbow going into the carb needs 4 separate tubes directing to each of the for barrels.
Pro tip for getting super close up with a telefocal lens without losing focus.
Zoom all the way out (wide angle) and move the camera right up to the subject instead of trying to keep the camera back and zooming in.
The intercooler dropped the air temp below the dew point of the water. Also, the inlet tube coming off allowed a drop in air pressure to near atmospheric which also causes a big drop in temp - like what an expansion valve in an air conditioner.
Cool.
I don't know if it's relevant with the US carbies, but there were some cabs with thin-walled brass floats, and they would collapse with even mild boost, causing the float's needle valves to fully open and flood the engine.
With the float design used there, some would paint then with a fuel resistant varnish, as some would otherwise absorb fuel under boost pressures, which also caused the engines to run rich.
Also glad Cleetus kept talking about and referencing your channel.
Rebuilding and tuning carbs is a lost art on large engines. Hell even small engines are injected nowadays... or sealed, like on lawn mowers. My Grandfather taught me 50 years ago how to do it. Used his brass screwdrivers that he had threatened us with a beating if we touched them.
I bought a great car for a 150 bucks because thats what the dealer would give the guy for it as a trade-in. Rebuilt the carb - had a loose midplate, thus a huge vacuum leak. Rebuild kit was like $12. Changed plugs, wires, cap and rotor. Less than a 100 bucks all in. That slant 6 ran great till i stupidly sold it to go to college. Dealer really wanted to rip him off - he knew it just needed a tune up. Cars needed them every 5 to 10 thousand miles back then at maximum. Maybe 3k for older cars. My Chevy Luv truck had dual points and ate them up so often i could set them roadside with a pulltab off a beer can. That was the old days. Cars were a pain in the ass back then.
Gota love points, and people complain about car maintenance now having to change them plugs every 100,000 lol
Soooo happy to see the dyno room reinforced! That tube came off with some serious fps.
I like the blues music interludes.
I had to cobble a Ford truck together. One time just to have a vehicle to drive. It was a 95 Ford extended cab. Pick up or put a 4 barrel intake on it and a point's Ignition distributor the throtel cable was so long. The only way I could get it to work was to put the card on backwards. With a adapter plate.
Wader! 😂 Had to. Thanks Steve for another amazing and educational video.
Did a quick Google search to make sure I was not going to make a open mouth insert foot comment but I was going to say 120+ years since the carburetor was invented(thinking 1904ish) and turns out it was 1886 so 158 year old tech is what you were working with! That is absolutely amazing!
23min 39-41sec mark on the video 🙂
As a youger dude, its cool to see you so comfortable with a carb. Wish I had a reason to get the experience, but laptops are so easy!
Enjoyable video seeing the magic air box do magic things.
I remember a 7th grade science lesson on air. When compressed air is suddenly released the moisture in it will condense into a cloud. That’s why you need a water filter on all air compressors, especially when using it on a paint gun.
Since subscribing to this channel after watching Cleetus video. Been going back and watching videos realizing how little I thought I knew. But absolutely enjoy watching them. Thanks professor Steve!
English major
@@userer4579excuse tf out of me didn’t realize I had to please the grammar police. Just making a comment but glad this is your mission.
@@Usmcwing WTF are you on about? Did you run out of crayons?
Never a dull moment at SME
We just got to see why it rains when the barometer drops. Pretty cool 😎