How Blow Through Carb Systems Work. It makes too much power!

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[@pete540Z]

Most people call those little screws on the metering block "idle mixture screws". I like the term "idle volume screws" because they control the volume of the emulsified fuel/air mixture from the idle/transition well to the idle port below the throttle blades. So they control the volume of emulsified fuel/air, not fuel, precisely.

[@strykerentllc]

The most comprehensive, detailed, and informative tuning/dyno presentations ever compiled. Appreciate the continued videos and of course no video is complete without Dewey making a casual or deliberate cameo. Cheers!

[@shawnquaintance1480]

Couldn't have said it any better! Pretty sure if you looked up the definition of customer service it's gonna have a picture of Steve!🤣

[@Mynameisthesenuts49]

Tim Nelson is the best

[@strykerentllc]

@@Mynameisthesenuts49 Never heard of her.

[@remb9614]

@@Mynameisthesenuts49there’s always one

[@WingspeedGarage]

But still incompetent enough to let the supercharger pull hot air straight from the headers 🤦🏻‍♂️

[@square_zerohero2281]

Take his advice as gold, and these engines will survive years at this level. I've been following him for decades, and I've built a similar setup to this at my home because of his builds Ive read about as a child. I have a 565 cubic inch big block Chevy with an F-1X Procharger that I street drive with the same 77/58 tooth pulley combo that he tried in this video with my timing locked at 30. I also have a 46 tooth blower pulley if Im able to use more. I haven't pulled my engine in 8 years. I appreciate the lessons he shares with us, and I'm thankful to enjoy the rewards of the knowledge that hes always shared with us for free. Expect brutal power. Good stuff

[@briananderson5284]

Thanks again Professor Morris for yet another great lesson 😊 your passion for teaching is Awesome love the longer Video !!! Keep up the Amazing Lessons!!!!

[@ericspratt3164]

“Who cares, it’s part throttle”. Words to live by right there.

[@lt1nut]

Ahhhh, the mantra when running Hilborns 👍🏼

[@gordocarbo]

@@lt1nut a man that "knows"..your post says it all lol

[@andretorben9995]

it revs to 5500 and it sounds like its barely trying, yet its putting out 1300hp. Just makes it look so easy to make power. Nice work guys.

[@mikef-gi2dg]

For someone like me, who has yet to do his FIRST BLOW THRU anything.....that is about three semesters of HOW TO MAKE HORSEPOWER, but be happy when you get less! I met Mr. Morris, when I came out to 131 last year to get a look at the wagon. I told him then, and it still stands...."if I ever got in a position to buy some power like this...I know where I am going". I know it's not an LS...and that's the point! I would leave it just where he ended, and in my MONZA'S, or 78 Malibu, or S-10 Blazer, or my 68 Impala, you couldn't cut the smile off my face. Quote: power is easy, making it live is the hard part!

[@blown572hemi]

Great instructoral video for beginners. I've always preferred carburetors. They are smarter than what people give them credit for. If running boost, they act like intercoolers. I'd like the spec's ondy engine tho. Great video as usual.

[@125squeeezer]

Idle mixture adds/removes air AND fuel air bleeds are air as you said. I personally change IFR if screws are out too much ie 2.5 x out.

[@dirgle]

Thank you for taking the time to do this. It was very informative and entertaining to see what goes into it. Especially on a blow through setup.

[@EASTSIDERIDER707]

I’m 72 and grew up on carburetors. Once you learn the process, it’s left to the individual circuitry. Holly was my preferred brand.

[@johnnyshell2839]

I agree. A touch rich on idle is way more responsive. Neutral or a hair lean gives that delayed gag then jumps. Its all within 1 second but that's the difference between competing or going home

[@wobblysauce]

If Street Car tad lean is fine.

[@johnnyshell2839]

@@wobblysauce probably. Unless you need to jump in traffic. That gag could be a bad situation. Even a daily. Go a touch rich. My 81 f-100 300 straight 6 is almost right for where I live. All I have to do is flip the breather cover for summer and winter.

[@johnmallios6643]

​@@johnnyshell2839bb ñ

[@NunyaBusIness-tl1ev]

Rich is better to compensate for high ethanol/additive gasoline and/or E85

[@gordocarbo]

Adjustoing for a stronger pump shot will clear that right up. Common problem with low vaccum big overlap cams also or not enough initial timing .

[@071903ma]

Great video Steve,, you helped me on my SBC blow through F-1 deal and these videos are tremendous help! Thank u for what u do!!

[@michaelkennedy2528]

The HP numbers on that engine climb faster than the National Debt Meter.

[@TexasTravels426]

Love the transition at 12:35

[@troylambert5140]

Steve Morris is an absolute American treasure this guy is absolutely incredible

[@crazydaze248]

One of your best videos yet! The information was awesome and very detailed.

[@chevy2adam850]

Awesome video and makes me want one of these Blow Thru Procharged setups even more! As soon as I saw your carb leaking I got flashbacks haha. When I received my carb from them it leaked from every orfice possible. The Needle and seat didn't even have gaskets installed. It made the dyno tech pretty frustrated with me while I tried to fix all of them. Not to mention one of the locating pins for the float bowl on the metering block was completely bent and fell out once the bowls came off as if the pin wasn't seated properly when someone cranked down the float bowl bolts. Contacted Pro systems and all i got was a "Sorry ill let my guys know to be more careful".

[@gordocarbo]

Oh F man that sucks. Youd think you spend top dollar for a custom carb and get a teeny bit of support Keith over at AED gives the best customer support Ive ever experienced. Hands down the best ever! Real patient guy wants every customers car to be its best. Not used to that still lol

[@sallombardo1678]

Hey Steve, I’m looking to put a ProCharger on my 565 and this is a lot of great information!! Thank you for your experience and help! I will be giving you guys a call within the next couple of days to figure out the right combination for me!

[@nitrousshovelhead]

“Who cares, it’s part throttle” finely something I already knew. lol. thank you for all your help

[@desertrat8322]

Steve awesome video as always , i really like those carb tuning tricks for dialing in a performance/ racing carb . Ive got a AED 975cfm Holley that was built by AED for my Shafiroff racing 427sbc

[@matthouse8499]

Thanks Steve and Kyle, you guy never cease to amaze me with the amount oh hps you guys get out of these engines , just waiting to see more on your sml blocks 😎👍🏻

[@BrainDeadEngineering]

My friends dyno , he installed a gas water tank and pumps hot water through engine pre fire up. He says he get work done faster and less cold start fowling and wash down 😊 i helped him plum it . Bunch or ball valves.

[@sidneysnottley6414]

Stay with the long form vid - always entertaining and informative.

[@mcummings4643]

THANKYOU STEVE n SON , you have a fantastic setup there and are great at speaking to us normal people. I'm a basic guy in Oz and I'm learning the finer things to get my next ride running properly, I'm more turbo rather than blower but things might change. Thanks guy's

[@gordocarbo]

Lovec blowers fora few reasons...driven many Turbo cars but neverb uilt one. Afraid Id get greedy keep cranking boost up til I popped the engine. Im that idiot

[@aaronguerrette]

25 years ago we were talking bout Blow Thru carbs. Glad they still get their due

[@vincel6340]

Back in the day (way back), Gale Banks made 350 SBC dual blow through turbo kits. The fuel pressure was controlled by a special mechanical fuel pump with the control line going to what was the ambient side of the diaphragm. The 850 Holley was modified with throttle shaft seals. Boost was bled off when the throttle closed under boost with a simple valve located in the special air horn. However, these could no way reach the HP/cu. in. this monster has. The highest HP street kit only produced 600 HP from 350 cu. in. (5.7L). The 700 HP version was not recommended for the street. This implies the situation could have benefited from modern turbos and better heads. The max boost was about 7 (if I recall correctly), so that was a major limiting factor, as the kits were designed for a stock block. Also, 7,000+ rpm was not an option.

[@alc1986]

For fun i googled smx engines an found a few people saying its not reliable an is a hit or miss so i had to drop some truth on them lol i told them that steve cares more about his engines in customers car than people know every evnt hes at an hos engines are their i noticed he takes time to check on how they doing or if they need help with a tune they also brought up the viper smx i also brought up tye fact that steve gives a wealth of knowledge an info to anyone i dont have a race car but if i did i would want a Steve Morris engine in caise i know 75% of it was made in house an assembled by hand an care

[@NBSV1]

There’s always going to be negative people. I don’t think there’s nearly as many SMX’s out there as there are people claiming they’re junk. At the end of the day basically any race engine making that kind of power is going to break stuff and have problems. Even at “only” 2,000hp it’s still easy to break stuff.

[@petermcilroy3224]

I don’t think he’d be still going if they were no good

[@lockedinstreetracing6005]

Of course there great engines look how busy he stays and it’s the same people buying more or doing refresh’s he had his very first engine on here not long ago it was like 22 years old there is gonna be negative people wherever there is success.

[@wakeUPdummies]

Anyone complaining about a race motor not lasting, does not have valid expectations. If they build it to be race enough, it will only run for a few miles. (and endurance could be the only complaint. Im sure every motor is tested.)

[@greatestevar]

Steve is the type of guy who sells things HE wants to be proud to own; You are paying for your problems to be his problems; He takes it very seriously. Anyone making noise is doing just that, making noise. If Steve built something that failed; I bet he would take it personally, and make it his mission to help his customer.

[@dmeemd7787]

The amount of information, and the things that this will trigger that I had forgotten or things I’ve never know it all, and every other conceivable combination… I am just beyond grateful for the quality and amount of content!!

[@ray_s281]

I love the carburetor talk.

[@drewmurray2583]

first engine I turbo'd was a 80 kawasaki kz750 four with the original carbs. I wore the screws out on them by the time I got the jets right! bought special drill bit set, extra jets. even soldering them shut and re drilling

[@jamesshaw89]

Fantastic video. This was really neat seeing how you tune a carb then detune the motor some to make it safe/live.

[@brracing7861]

Thanks for the Tuning Tips Steve Morris.

[@15trucklt83]

I learn something every time I watch his videos. And I thought I knew a good bit about how internal combustion engines worked.

[@taterkuhn5048]

Got a custom built Pro Systems Dominator a couple years ago. Had fuel leak issues and didn’t want to idle. After taking it apart it was nothing like the supplied build sheet said it was supposed to be. It was basically a stock 1050 spec carb. It didn’t perform any better than my home built carb did so I Sold it at a swapmeet. Bought a custom Braswell carb that works well but no better than my old carb built by me outta Holley/QFT parts from yrs ago. Go figure. Guess I’ll put together my own carbs from now on….

[@justinfargas2367]

The other thing with the cards is, watching KZbin on a television, is usually most tv's don't have an option to "display cards". All mobile phones usually do however. Another banga video. Thanks chaps. 😅

[@davidgraham5889]

Idle fuel screw. Back off a half turn makes it richer. Open an idle air screw a half turn, which makes it leaner. You almost had it correct, you correctly called it a fuel screw but started calling it an idle air screw again.

[@pockets5628]

They are called idle mixture screws. Not idle air screws. They do not change the amount of air in the idle circuit, only fuel coming through the IFR jets. Tip in is controlled by the transfer slot exposure/fuel, and the accel pump cams, and lastly squirter size.

[@harryjohnson2]

@Steve Morris Engines how about an open house one day in the spring? I am sure there are several Fans that would love to check out and tour the shop.

[@waylonrichter1253]

I love it when the parts guy drops a spark plug (still in the box) and hands it to you like there's no way it could be broken. 23:00

[@funkiwikid6106]

Thanks very much for the little things that make the big difference.

[@gordonburnett9672]

Fun day tuning, the second pulley set, was good, it dropped the mid range torque bump which is good, that area can be the one to hurt bearings, and break other stuff.

[@AceMon2005]

You don't necessarily have to have gas in the fuel cell for a procharged race engine to make power, but it helps.

[@ilovelulu8492]

Almost 1400hp on pump gas is pretty damned impressive.

[@garryharris2082]

Very cool to see that Steve uses Your Dyno controls and software.

[@todd8109]

This is some of the best information about carburetors I’ve seen with a ProCharger

[@WilliamDundon]

Wow great engine. Thanks for all of the details Steve

[@waynep343]

Steve. I tune holleys for friends street performance engine. Look at the A/F at 1700. Is it rich or lean. Change the idle feed reatrictions. 327 to 335ci needs a 0.031" IFRs in the primary .metering block. 347 to 365ci need a 0.032" IFR. a 426 to 438 needs a 0.036 IFR. Since the idle circuit is just like the main circuits. If the idle feed restrictions are too small you can change the idle bleeds all day long and nothing gets better. I check the primary main jet sizing at 3800 to 4000 rpm. Look for 14.7 af change the primary main jets to bring it in. Once this is done. Blip the throttle rapidly from idle. If it lean backfires go up a size on the pump discharge nozzle. Try blipping the throttle again. Once you get the idle feed restrictions corrected. You can look at idle air bleeds that effect fuel curve by looking at iar fuel at 1,000rpm, 1,200, 1,400, 1,600, 1,800. You dont neef to go higher than that as the primary boosters are starting to trickle as the idle feed clots slack off ss the the throttle blade opening reduces pressure drop across the idle transion slot. By 2,400 rpms the primary mains are feeding alone. The primaries max out in the 3,800 to 4k. Rpm. So that is where you look at the primary main jet size. You will need to do the 2.4k 2.6k 2.8k 3k 3.2k 3.4k 3.6k and 3.8k to see which ways you have to go with the primary air bleeds. This sounds complicated. Its not. Just doing this to friends cars usually results in a wow when they come back frome a test drive . I have gotten complaints that they cannot feather the gas pedal enough to not spin the tires at every red light or stop sign.

[@codyypettersson7119]

Perfect video after a long work day!

[@Thumper68]

I prefer carb on my vehicles just so much easier and I don’t have to worry about electrical issues

[@merr6267]

Spy the AvE sticker! Haha.

[@metaltrucker97]

Thanks Steve, I learned something today

[@carlstephens-tm7zj]

Merry Christmas to all at Steve Morris engines

[@michaelatkin9649]

You just need to buy Kyle a car with a carb and make him drive it to work everyday

[@Hoaxer51]

And make it a quadrajet so he has to work on it more.

[@throttlebottle5906]

would he ever get to work??? 🤣🤣

[@planesofpaper]

Such a good video. Amazed to see a fixed timing amount. I love the learning.

[@chief3378]

I just learned a lot about carburetors that I wish I knew 35 years ago

[@ldtenenoff]

too Funny at 38 Mins this thing is makin Steve Scratch his head on every pull LOL! Men and theyre Machines thanks fer the Smiles and Knowledge on this this Video Mr.Morris

[@jasonseiverling5354]

Added bonus of carburetors. Once you get them setup correctly the plugs look perfectly safe. And once you get to that point you know exactly how you can lean on it bit if you need it. Love your videos, Steve. 👍

[@DisgustedGenXr]

Where were you 10 years ago. You actually take the time to “overexplain” ( which I am accused of all the time , refrigeration tech) to make sure even the weary understand. You sir , are the man!!

[@Dannyvirk]

What i find funny is that the oil pressure drops at peak revs and Steve says 'i'm going to add a quarter', i'm a dickhead that has driven the same camry for the last 20 years, but I would expect the oil pressure of that engine to drop slightly at max revs. it's still over 90 P.S.I. That pressure looks perfect to me (who is just a key board warrior). Thanks for the content Mr Morris

[@bradley3549]

Why would you expect the oil pressure to drop at max revs? The pump is spinning faster and the clearance on all the bearings remains the same.

[@Dannyvirk]

Cavitation, and i'm just starting@@bradley3549

[@Dannyvirk]

could be relief value venting, might even be the fictional loses in the oil line at such high volumes @@bradley3549

[@joebloggs2635]

It is running out of oil in the pan to pickup. Under normal conditions, it would be gravity fed into the bottom of the pan more effectively.

[@Dannyvirk]

Do you actually know that? over 90 PSI, hardly running the bearing dry....... @@joebloggs2635

[@michaelgallopo5879]

Very strong engine awesome video...keep living the dream ✨️ Merry Christmas to you and your family

[@albertomoniz9051]

Awesome dyno session Merry Christmas to and everyone at Steve Morris Engines . God bless .

[@Hoosier81]

Just want to wish Steve Morris family and crew a Merry Christmas 🎄 I’ve learned a lot watching this channel, Ty

[@stevemorrisracing]

Thanks

[@timlarson9193]

Oops! Making too much horsepower! 🤣🤣🤣 Just don't hear that very often

[@StephFourie21]

Man them herspers just wanted to run free and Steve over here putting them in the pen.

[@davidholcomb9961]

Great video! Lots of great info on tuning the carb and dialing down a blower motor.

[@stevemorrisracing]

👍

[@skyfreakwi]

So it's the idle mixture screw. Not the air screw... Not if it adjusts the fuel level. (Motorcycles get both. If it's by the bellmouth on the intake side it's idle air open it up to lean the idle. If it's on the engine side it's the mixture screw and will add gas when opened.)

[@donsmanufactory]

I attribute that tip in stumble to the low manifold vacuum caused by a “bigger” cam. I reduce the air bleed a bit more and close the idle screw a bit. Same idle mixture but a richer tip in. If you don’t go too far it will run smooth through tip in and not tank fuel economy.

[@azmartin1977]

It would be great to know the manifold air density with the different pulleys combos, Gale banks has a set up that would be of great help with extra data.

[@jasonazbill9898]

All my ProSystems Carburetors from Patrick come dead on. We have dyno proven a few times that the jetting out of the box is spot on. Not a better carb or guy out there on the market.

[@jdias51]

Tossed one our 383 with a single carb blower went a full pitch up on the prop and zero bog and never have touched the carb

[@hankhank3129]

Great carb tech, thanks! I mentioned a few months back because nobody really talks about it anymore.

[@LilFoxAK]

Steve flexing his knowledge on this one. quick question, those idle adjustment screws dont back out in the car with solid mounts/poly mounts? thanks for schooling me in carbs today!

[@DavidRogan-on8vu]

Admire your work . I know you weren't concerned with the oil Pressure as RPM increased , I have had 2 similar experiences with 540 big blocks & it was the Milidon Pick up that caused the issue ? .

[@DRacing10]

Nice refresher course on carb tuning.

[@philabowl8073]

We need a decibel meter in the dyno room!!!

[@sneezinhatch]

Curious what an SMX would make if it was built as a full NA engine big cam,etc

[@padders1068]

Steve, thanks for sharing and educating! Great work Sir! Happy holidays to you, Dewey, your family and friends!

[@jarmominkkinen9409]

Grate Video Love the carborator!👍

[@tomscustomshop]

Nice result!

[@pete540Z]

I recently found a cracked spark plug insulator on my SBC by opening the hood in low ambient light. Lots of spark leaks around the boot.

[@tonyking9235]

STEEV ITS CALLED DIMINISHING RETURNS.

[@Sinnicide]

Not me seeing this title with my 1984 Honda Magna immediately thinking BUT CAN I TURN MY MAGNA INTO A BLOW THROUGH?!?!?

[@calvinevans8305]

27:08 What's wrong with it Carl? It ain't got no gas in it. Lololol 🤣

[@toddgreim9254]

Thanks Steve loved this one!

[@gordonstarship]

Thank you for sharing this knowledge. I always learn here.

[@parsonsenergy]

Tanks Professor glad school is back in session...

[@ray_s281]

Thank you!

[@shoominati23]

Have you tried during a Morse test on your Dyno? I.e. dynoing engine full pull, and then pulling off individual plug leads and retesting to see what power drop per individual cylinder? Stock)ish) smallblocks usually make about 6 - 8 % better power on the middle cylinders, than the end ones - especially the rears I'm sure most know why..

[@greatestevar]

Flex/distortion is your answer as to why middle cylinder make more power

[@raindeergames6104]

Man this is how I like to start my day💪🏼💪🏼

[@young11984]

My blow thru turbo liked 11-12:1 afr WOT and 12-13:1 cruising with iron heads but my buddies with aluminum heads was happy with 11:1 cruising and 10 wot. Soon as i saw that fuel pressure on the graph i said….aint got no gas in it😂😂

[@vehdynam]

Great carb/boost tuning information and much appreciated. I am in Canada , and for what I do EFI is too expensive here , thus I use carburetors. Many thanks.

[@royduenas1192]

Exceptionally informative video, yet again, Steve! Happy Holidays! 👍🏼💯🇬🇺

[@MrCheckster2000]

Back in the early 90s i Had a 302 windsor with a blowthru vortech supercharger making 15psi amd it ran like a scalded dog but the only thing that always puzzled me was with a 650dp carb I had to run 99 jets on all 4 corners to keep my stochiometric ratio proper. Weird huh?

[@knottypine7935]

Steve has forgotten more than I'll ever know about engines. Love watching the videos! ♥️🇺🇲

[@robmassicotte4889]

thats YOURDYNO? Awesome to see that! I use yourdyno for my motorcycle dyno, always wondered if it was just "regular" guys like me that used them, its great to see someone of your caliber using yourdyno!! Thought for sure you would be a dynojet guy..

[@kennysteppan7934]

The air screws limit the air! Shut down the air, it's rich!

[@billclark5943]

Don't worry Kyle in 20 years when he's old and decrepit you'll get to have your fun with him😂. We'll all be watching😂😂

[@jeffreydurham5342]

Anyone that has a dog that looks at them like that is allright in my book.

[@s1acr457]

Too much horsepower?! How dare you Steve! 😉

[@djwilliams4714]

Steve teacher of the trades!! What is old is different than New!!