How to Tune an Engine - Initial Settings, Ignition, & Carburetor Theory of Operation
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- Опубликовано: 30 сен 2024
- Today I show you how to set up a carburetor on you car or truck!
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There’s more to teaching than simply having the knowledge. YOU have it all young man. Thank you very much, the teaching will be put to good use on my 1952 studebaker commander land cruiser v8 rebuild. Thank you.
I would rather watch his mistakes.
I agree @Roger Gonsoulin
I'm pushing 40, been screwing with carbs for the past almost 30 years. I can get them to work, I kind of know what I'm looking for. This is the best explanation I have ever heard, and it makes me realize how much banging my way through tuning a carb was mostly dumb luck. Thank you
Bro your amazing with these videos. Keep up the hard work and here’s something that might make you more happy. I’m a younger person at 13, and I really want to learn about cars so this video taught me a lot. Thank you!!
Nice to see younger people getting into cars hope you have fun when you get your first ride!
As a younger guy just starting to get into the world of fixing an older carbureted vehicle for the first time. This is hands down one of the most valuable videos I’ve stumbled upon thus far. Thank you.
Great guide! I'm a very digital person and always had a harder time understanding carburetion versus computer/EFI control. But I'm planning to build a retro street rod in the next couple years and fuel injection just doesn't feel right for what I have in mind. So this is a great start-to-finish for essential understanding and tuning that I will probably be coming back to later. Thanks!
You could not have released this at a better time. I just finished a 2 barrel to 4 barrel conversion and as this my first project car and it runs like crap, I am about to start this process. Beautiful to see how this is done, step by step, from start to finish. Thank you!
Just a follow up. Went at the carb with a calibration kit and the knowledge I gained from this video and it runs 1000% better. Still need to go at it with an AFR gauge to get it really dialed in but still, WAY better. It think it must have been jetted for a lawn tractor. Again! Thank you!!!
Most the carbs I work with are Japanese CV carbs and Weber 32/36 series. Any chance on covering something like those? I only ask because you have a way of explaining things that even my dumb self can understand! Keep up the amazing work guys!!
I had a Weber 38/38 on a old Toyota that I never could get to run right. I think the team need to start getting into EFI soon ;)
I know CV's really well and these downdraft things are nothing like them!
Is their vacuum in hPa instead? 😉
CV have always been my weakness! When I'm working on motorcycles I usually replace them with a flat slide pumper carb because it behaves like a holley😂
Hey dudes, waiting on you to create your new channel, Barn Yard Digs. I need my agriculture based revival content man
VERY WELL DONE! It's been years since I was sitting in my high school auto mechanics class learning about carburators and you brought it all back to me in this video. Actually, I think you did a better job explaining everything than my teacher. I really enjoyed the refresher course! Thank you!!
*"The best time to plant a tree was 20 years ago and the next best time is now"* I consider this to be best motivational quote I've heard in a very long time. But motivational quotes are useless if you don't practice what you preach*
You're right, that's why I invested into assets like cryptocurrency and some stocks
Stocks are good to invest on, but crypto is more profitable
I heard that his strategies are really good
@@mortenbolin7481 Will I know about Mr Dave Jevans he's a good broker, and more his trading strategies are top notch
That's a good idea, but how do I get to Mr Dave Jevans?
Instead of using paint, you can also use white out. Been using it for years with it never chipping, cracking, or peeling. Great video.
Holy shit why didn't I think of that
Girlfriends old nail polish that they no longer use also works great
I really feel like you could be a great automotive instructor. You don’t talk over peoples head that aren’t experienced. You take your time to explain and are thorough. You’ve got so much knowledge and patience. Thank you for always putting out GREAT content.
Man I love your videos and I hope you can do more instructive content like this.
I said it before about the camper video, now I find myself saying it again after watching this video. Thank you. This is still the best explanation of carburetor operation and tuning I have ever seen. I only wish I had gotten this level of teaching when I was in auto school years ago. This explains so many things that didn’t know I was doing improperly for a long time. Thank you for helping my dumb ass get a little smarter.
I like the way you approached explaining this and appreciate you taking the time to do so. I personally have two things I do first before getting to the beginning of your list.
1. verify the harmonic damper is in good shape. A bad one can have the ring slip and your timing marks are worthless. If we are trying to deal with an older car with a carb we are talking a vehicle that is at least 35 years old. The ring is held with rubber. Rubber can fail, it cost me 18 years of child support.
2. With the distributor cap off, bar the engine opposite of rotation until the rotor moves. Then bar the other direction to see how far you can go until the rotor moves again. If the thing already runs like ass, it might have nothing to do with the carb and just have a stretched timing chain. You need to know your valve timing is true and correct before doing anything or there isn't going to be a point in fiddling with it, no matter what you do it will run like ass. When it can't be driven, you can't get to work to pay the child support from the time you trusted a piece of rubber.
I remember the motor home table talk. I got a LOT more from this edition. Thanks so much for the lesson.
Great video , very well covered and nice and clear . Dealing with carbs. is becoming rare so to find someone that is good at it is getting harder and harder . It is great to see younger people taking a interest in this topic and Knowing what their taking about . Thanks for taking the time .
It's worth mentioning that digital timing lights have difficulty displaying accurately when used on ignition systems with multi-strike capabilities. Inductive timing lights work better with these systems.
I've always wondered about that!
Super stoked for this one. I haven’t messed with a car/truck carb in years.
One great educational video. Well done :)
Thanks for sharing. I saved this so I can come back to it in the future when I forget about carburetors again.
What an awesome video 🤘
Awesome always guys 👏 😎
Great work! Now I've got to go and get a car to work on. They say if you can't explain it simply you don't know the subject well enough. Your explanation is perfect.
Ah yes, carburetors, so simple but yet so complicated
thankyou for this video its really gonna help me with the problems I'm having getting my first car road worthy
@junkyarddigs....that was a great heckin analogy with the vacuum cleaner. Easily understandable by folks that don't know. Check out "smarter every day" on RUclips. He's got a great video where he built a see thru carb and filmed with high speed high zoom HD! Really neat
Great points on the ladder only fix the circuit that is having the issue nit any circuit below it Kevin camper carb build was a great video also @Junkyard Digs
Pittsburgh automotive Vacuum guage cool to see harbor freight tools in the wild Kevin @3:26 @Junkyard Digs
Kevin, this is a wonderful video! You did an amazing job; it's very informative and easy to understand and follow. Now...I understand that you love Holley's for a bunch of different reasons, but, would it be possible to do another video just like this one only centered around an Edelbrock carb?? Good job and keep up the amazing work! I learn so much from watching you, thank you!
This video's meant to be universal across all carbs regardless if Holley, Edelbrock, Quadrajet, etc. etc.
Fascinating! I've only ever touched a small engine carb which I do basically by ear (plus tiny
Tach if I'm feeling nerdy or anxious), none of this vacuum gauge or timing business 😁 On the other hand, my old car is just good old VPW OBD2 and I don't get a KR live data unlike the newer car folks on RUclips...
Great job explaining and demonstrating how to perform the timing and carburetor adjusting. I have a lot better understanding now of how the circuits within the carb are to be adjusted. Your ladder diagram made total sense! Thank you!!
For a distributor with points ignition before you set your initial timing you need to make sure your dwell is set correctly because, changes in dwell will affect your timing, also when setting initial timing make sure your idle speed is low enough to where your centrifical advance hasn't partially engaged. a Holley double pumper is designed and sold primarily for racing and are okay on the street as long as you aren't the one paying for your gasoline.
Well done Kevin, really. I am 63 and have been building Holley Carbs since I was 15, and I think this is a great overview view of a Holley, and basic tuning procedures. I have an old SA Designs book on Holleys that has notes and jet numbers, etc on the inner rear cover and in the margins of pages. I was 16 when I wrote most of that stuff. That book is also a great resource if you can find one. It might be helpful to talk at some point about the things to never do with a Holley, like over-tightening the float bowls, or the base plate bolts, etc.
I run into so many carbs idiots have had there hands on with warped metering plate surfaces because some clown couldn't stop and change a gasket and tried to tighten the leaking gasket away. I was happy to hear you address the mixture screws with the caution on over tightening...another place the ham- fisted idiots leave traces of their "work".
Absolutely the most comprehensive video I've ever seen. Of the other videos watching you speak on timing I was still shaky on the "total timing" but you did an amazing job here and my understanding of these systems has definitely increased by a lot! The time and care you put into these videos definitely shows man thank you
I've been hoping you would make a video dedicated to carbs. Now to watch it several times and learn everything to know about carbs, even though I'll probably never work on one
I think I misunderstood my doctor when he said I’m low on carbs. Great video nevertheless
Yes bro I've needed to learn this and I still don't know how to tune brakes dispute I've watched half your channel in a day!
Who is in the black jacket & helmet walking in background @ running time 12:20 to 12:35?
Thank you for blessing us with these great videos
Solid instruction. Many thanks for detailing the tune in a well spoken, natural, and even-toned way. A compilation of focused teaching per individual engine component (for a common V8 build say) would I expect be extremely popular; maybe even lock-in your channel for 1M subs. Appreciate the consistently excellent content.
Excellent job. I really enjoy these in-depth educational videos. You teach it well. There's a lot of info here that seems to be lost to many people wrenching on old cars and such.
Honestly, you could be a shop teacher. Very easy to understand what you are saying. And obviously you are not just blowing smoke because the trucks you work on always seem to run good. Thats proof enough for me. Great video!
We all know now all you need is a lawn mower carb. Thunderhead 289 FTW.
This video is going to come in handy when I put the motor back in my c10 and get it back on the road.
We ❤️ junkyard digs!!!!!
Any chance you’ll cover motorcycle carbs? I am pretty confident I could tune a car carb, bikes still mystify me tho. Love your vids, been subbed for a while 💕
Wish I could, but cv carbs are my enemy 😂
thank you, that was one of the best videos that i've watched in a long time
Tuning mixture screws using a vacuum gauge is some of the most satisfying wrenching experience I've had. Well, screwdrivering I guess. But anyway, setting timing, checking to see if the mechanical advance works, getting the idle smooth, using the timing light, all this, it's a skillful art and if you know you know. YOU definitely know and sharing that knowledge makes you a stand up guy. Great video, even if you feel it's all over the place, well, this is how it is with these cars, you get started on a process and then two more things need fixed before you can get back to what you were doing. In this case, the advance springs jamming up and running out of fuel were the two that got you!
Beautiful. Brings a tear to my eye.
That was a great video and explanation. I've been playing with cars for years and your explanation really helped. The ladder analogy was very helpful as was the carb diagram.👍👍👍
Excellent explanation. I'll be utilizing all the great tuning tips when I drop in my new Corvette distributor this weekend. This was the video I needed, when I needed it! Was on the fence about getting the dial timing light for the job, and the addition vacuum tests to dial things in... perfect. Thank you!
Thunderhead289 has a great video about installing distributors if you get stumped!
@@JunkyardDigs Thanks, I noticed your clip of him during the video. Honestly the hardest thing is applying what you showed on that carb to the Edelbrock I have. Though I think Uncle Tony's Garage may have something on RUclips I can reference. You 3 are the only ones teaching vacuum tuning and I'm soaking it up!
Even fuel injection vacuum is super important no matter if it's carborated or fuel injected all gas engines are air pumps using gas and air to continue Rotations good video as ways Kevin great teachings @Junkyard Digs
Too many carb videos neglect the importance of timing and you did a great job demonstrating the relationship between the two
Sheesh I had to become 67 till I *really* grasped the function of a carb - thanks to your very instructional video! Many thanks for this - you are a natural teacher!
notification squad!🔥🔥🔥
Thanks for making this video my dad and I were working on restoring my 1967 c 10 and unfortunately he passed away before he could teach me how to tune it properly. This seriously is the best video I have seen explaining the process and I have a way better idea on how to do it. Thank you guys
Thank you for the very informative vid.
This is a lowkey really informative video on tuning in general carb or EFI
I’m so glad you did this! I’ve been watching a ton of your videos over the last year and it’s really making me want to do what you do! Thank you for acting like the gearhead family I never had lol
Always here for you guys 🤘
I’m new to carbs and have been lost for months while watching numerous other videos on RUclips including ones from professionals at places like Holley. This is hands down the best video on the subject out there. I feel like I actually know what I’m looking at when I try to get my car tuned. Thank you for this!
Found this to be very helpful to be honest I wished I found it a month ago would of saved me from alot of guessing and the constant back an forth on each step though looking up what to or how to where haha I'm definitely a you tube mechanic
Dude, seriously, great content. Thank you so much. I love the channel, the people, everything. I have heard about other RUclipsrs loving Ford and I couldn't figure out why, now I think it's because they're so much easier to work on and understand. Maybe not. I don't know. Great content!
thank you for showing the actual science of carbs and not just old superstition and old tuning knowledge.
Amazing explanation on how the timing light works and how you use it including what you see while using it Great work Kevin @9:30 @Junkyard Digs
Is there any difference between small and big block engines when setting this procedure?
No
You sir are a blessing, this is the video that finally helped me get my old mini truck running again. Up until you released this all the resources I found only helped me to make it stop running or run poorly. Now she's purring like a kitten!
Love it, Schrödinger's Macro Law: Define your variables first, so you know what you are measuring
Kevin, I’ve been watching and learning several years now. I have a newly built 347 in my Mustang. I have an Edelbrock 500 cfm carb, Pertronix ignition and a mild street cam. My engine builder said that I should not use vacuum advance. I wonder why!? It actually runs a bit rich and has an instant stutter for a split second if I punch it…., any ideas!? ( yes, I am converting to a sniper soon!)
FYI, new motor builds. Setting distributor to 0 degrees every time. Rotate motor to TDC, pull #1 spark plug and hold against block. Rotate distributor with hand. When sparks, motor and distributor are at 0 degrees.
Amazing, very much what I needed to see for working on my cars! You are the only person to actually describe how a carburetor works in a way I could understand without relying on "oh yeah just do XYZ and it'll run better", those people never explain why (probably because they don't know why). Looking forward to more "Tech Tuesdays"!
FINALLY found something local that has a carb and remembered this video from a few years back.
YOU are my go to.
Anyone interested I picked up an 83 F100 XL with a "Built" 302 and a Holley Street Warrior that is flooding horribly.
Wish me luck, and can't wait for your next upload.
Great video guys keep spreading that knowledge!!
Great new video. Very well done
Nice job.good to see old school tuning again.
WOW! WHO KNEW ALL THIS FUNDAMENTAL APPLIED PHYSICS WAS INVOLVED IN THE MECHANICS OF SETTING THE TIMING AND CARB, I HAVE TO KEEP THIS AND GO OVER IT AGAIN AND AGAIN SO I CAN TEACH THIS TO MY BIKER LADY FRIENDS. THANK YOU.
This video is great, but I’m still dumb I have a vacuum secondary Holley on a 355 sbc any help appreciated love it to run a little cooler to bring them sandwiches on home lol looking to help the idle out I’m currently running ported vacuum to my vacuum advance and it’s pinging pretty bad during pulles 50 psi of oil pressure at idle tho
also could you go over the diffrent types of venturis. annular, dogleg ect
Hi there ,i am from GERMANY owning and running a Wellcraft 26" with two 5.7 GM motors. They have the original ROCHESTER carbs mounted.
Thank you for these very understandable explainations.
Question : beside everything is working fine with the ROCHESTERS ,is there a possibility to improve power or effiency with other carb´s ( HOLLEYs or others)
Thanks Kevin, I just used your fundamental initial steps to dial in the 1960s 2bbl carb on my 1967 Toyota Stout.
One question if you see this, how do you bring the idle down after getting the mixture and idle screw optimised for peak vacuum?
My idle is sitting at about 1000rpm with base timing approx 12deg which is 1.5x factory setting.
Even if I drop the timing to the 8deg factory setting, the idle stays high.
Thank you for showing how to do this. My youngest son is getting married 5/18/24 and would love to get his '78 Nova running and actually drive it for the wedding & reception. We have it running for the first time in 10 years and it is a complete block rebuild 355 with a mild cam and rebuilt heads. It runs if you hold the throttle open slightly, but then dies. I want this so bad for him but not sure if it actually will as the guys that were to help tune it are booked-up. This project started as a high school kid mowing yards to buy his first car. He bought it but never actually was able to drive it. Hopefully he will be and to in less than a month. Love the videos & thanks again...
Agreed....great video. Trying to make sense of transfer slots, curb idle screws, and vac advance. It's a lot to absorb. This video definitely helped. One question I have however....when you adjust your AFR screws for max vacuum, it will change your idle RPM. Do I simply retard or advance initial timing to get to the idle speed I want? Or,......as some guys suggest, crack open the secondaries a tad to increase? Doesn't seem too popular with most tuners. But I am hell bent on not turning the curb idle screws any more after learning about transfer slots. It seems like a back and forth operation. Turn distributor, adjust air/fuel, turn distributor, adjust air/fuel.
And, how much vac advance should I be adding when running a non HEI distributor? Seems to be an elusive answer. If at idle I'm creating 15 manifold Vac, do I adjust my vac can to
Wonderful video for us shade tree mechanics. I bought a 67 Chevelle with a 396 in it. I know nothing about the motor but it does sound like it’s got a small cam. The carb is a 4 yr old 670 Holley. A certified mechanic said it has 9” of vacuum at idle. He set the 14^BTDC and total advance at 31^ . As far as I m concerned it still doesn’t run correctly. The tranny was changed to a 700r4 . Not sure if that makes any difference. I did notice this car has had a bung welded in the exhaust.
As far as I know nothing has been changed in that new carb that was purchased from Speedway.
Any advice on where to begin would be appreciated.
You explain things very good. Sounds like a AFR gauge is a game changer
Thanks
Learned alot. Awesome video. I have a 65 c10 with 350 sbc with mild cam highest vaccum I can get is 14 pounds of mercury. I have edelbrock carburetor with only 2 adjustment screws. Any suggestions would be appreciated. Thanks.
Three grand isn't "screaming"... 🤔
7300-7400 RPMs with a big block, now THAT'S starting to approach the screaming zone. 🤷
You brought back a lot of memories. Some of the steps I knew back in my early 20s I am now 69. I worked on my own vehicles as a young Army Trooper. Your video is excellent and content is plain and well understandable. I have Subscribed to your channel with notification. My Son and I have been trying to get is 1967 Chevy C10 to run better. We replaced the engine with a 327 that was built for an air boat. The air boat owner did not like the lack of kick when starting so he put this engine up for sale. It has a total of about 50 hours on it. We have been trying to set the Holley Street Dominator 650. It runs Ok but the fuel mileage sucks. I now know were to start.
Again a great video. One question on an AFR were is that connected while road testing.
I'm being impatient waiting for MOOK to make an Updated Video for the "Toasted Nova"...
Nova needs a LS Swap or a Rebuilt 350, with a TH400 Transmission with a modified rear Differential!
Leave all the "toasted" body panels please.
Very well explained. Yes, compounding....just like timing....which should also dispel the differing opinions on ported/non-ported vacuum advance.
We didn't bother trying to paint a line on the harmonic balancer mark. It's quicker to fill the mark with a piece of chalk and then, if you got some before/after the mark rub that part off. Quick, easy, and lasts just as long given the rain, etc. that splashes up on the balancer.
Thanks this helped alot I also loved your other videos
Hey, I really love the ladder analogy. I'm new to tuning a carburetor and have learned so much from your videos. Thank you for sharing. Do you have a follow-up video that tells you what to do if one is having problems with one of the 'rungs' on the ladder? I've got some mid-throttle hesitation on my new Edelbrock 1406 on a Chevy 350 and am not exactly sure if I need to adjust the power valve or the secondary jets.
This is an excellent video. Very complete and understandable. I was able to tune my carburetor after struggling for the last month. Great job, really enjoy your videos. I’m an old guy but you taught me something , thanks
I had a Carter AFB on my 1970 Model J Grand Prix with a 400 CID, I THOUGHT I knew something about Carbs when it went bad, there IS a science to rebuilding, and, adjusting a Carter AFB, had to take it to an expert!
I have 350 chevy truck 1978. When I use the gauge, the reading is not stable. It’s jumping pretty bad. Could it be the timing off? I’ve installed brand new Edelbrock 600 carburetor.
So if I have 19" vacuum at idle I need a 9.5 power valve correct? I have a 680 QFT on a 350 with mild cam and it idles rich. I am new to carbs.
Hi Kevin - nice work here. Maybe you already do but you should sell a poster of that procedure on the whiteboard, as well as a book to go with it. Perhaps collaborate with Luke. I think it would sell well. I would be interested.
TB
What about valve lash itself along with all this on mild cam 350 motor home motor with an edelbrock very new to 4 barrel stuff and it’s runs and drives currently trying to make it happier in my 1971 C-ten any tips appreciated…
Perfect video. Next week I'm gonna buy my first 1970 Italian twin double barrel carburator car. The car stood for some years, but it ran good upwards of 2000 rpm when tested last week. Only in idle it was a little weak. Looking forward to tuning this sweet project-car once I fixed the brake issues and some electrical issues with the lights.
I'm not so much a Holley Guy, but lots of people still love the Holley. I'm now using a new Edelbrock 650 for my stock standard Chevy 350ci.
I also have a used Holley 4165 lying in the garage haven't used for years. What do you reckon I should use, and why?
😁😃😄😆😅😂🤣 Schrödinger's carb! I love it! I'm definitely going to use that for future idiots who ask, "why do we have to tear the carb apart?"