How to Rebuild a Carburetor: Quadrajet 4 Barrel - Muscle Car S4, E18
Автокөліктер мен көлік құралдары
Learn everything you need to know about Quadrajet carburetors, including how to rebuild one correctly, what kind of performance to expect, and why they've gotten a bad rap. Plus, we'll show you how to apply do-it-yourself floor coating.
PARTS USED IN THIS EPISODE:
Edelbrock: Edelbrock Q-Jet Series Carburetor Calibration Kits.
More Info: pntv.us/pb_pt_6401
Loctite: Threadlocking compounds.
More Info: pntv.us/pb_pt_6400
UCoat It America LLC: UCoat It floor coating systems are designed for the do-it-yourself-er. Every UCoat It Kit comes complete with applicator tools, instructional video, applicator guide, and all the coating materials necessary for application.
More Info: pntv.us/pb_pt_6395
O'Reilly Auto Parts: Choke Thermostat
O'Reilly Auto Parts: Carb. Rebuild Kit, Float
O'Reilly Auto Parts: Choke Pull Off, Float, Filter
O'Reilly Auto Parts: Carb. Cleaner 5 Gallon
O'Reilly Auto Parts: Miscellaneous
O'Reilly Auto Parts: Case of Brake Clean
O'Reilly Auto Parts: Touch Up Paint, Primer, MetalCast
O'Reilly Auto Parts: Spray Gun Brush Kit
The Eastwood Company: CARB. RE-COAT GOLD AND SILVER 2 EACH, CARB PREP (6)
WD-40: Multi-Purpose Penetrant and Lubricants.
Пікірлер: 471
Low budget project from this channel? That's rare
@billthompson5644
4 жыл бұрын
You've got that right.
@_JoeMomma
3 жыл бұрын
Today on powernation we are gonna do a budget build truck! *3 episodes later* Alright our budget build was $45,895! Wow that was cheap!!
@cartailincautodetailing946
2 жыл бұрын
@@_JoeMomma 😂😂😂😂
Back in the 70's when I was in my 20's I bet I rebuilt 30+ Q-jets when I was a mechanic working on boats with GM motors and friends muscle cars. Watching your video I was surprised how much I forgot over the years. Good video, thanks for the memories.
@flat6fever680
Жыл бұрын
I love that: " Back in the 70's, when I was in my 20's" has a cool ring to it.
Its been a long time since I had rebuilt a Q-Jet. When I use to run them back in the 80's and early 90's I had nothing but great results using them on my '70 Nova, '77 El Camino, '67 Catalina, and '82 Trans-Am.
The Quadrajet is the closest you will come to fuel injection results without actually going to fuel injection. You can control and tune every aspect and range you need with these carburetors. One thing I am surprised they never addressed was the throttle shaft wear. The base plates should have had bronze bushings installed from the factory.
ripped the TBI fuel injection off my truck for one of these. ABSOLUTELY LOVE THEM!!! i’m convinced these are the best damn carburetors out there!
Quadrajets rule,best carburetor ever conceived,once properly tuned delivers glorious acceleration
Brown recluse spider ya got right there... Nice rebuild..thanks
@latimbmdi3313
4 жыл бұрын
هغبف
In the 70s I had hundreds of the Qjets apart. When built right they worked fantastic. I had a custom one off that I built for my LT1 never had anything else on the engine!
Q-jets are great carbs! I would grab every one off the big block caddy’s in the junk yard and build them for my small blocks. If you kept your foot out of it they would get great mileage but when you stomp on them they made the best throaty sound when the toilet bowl secondaries opened up. And I was familiar with all the tricks they talked about in the video.
@JosePena-po4zo
2 жыл бұрын
quadra junk
@jeanlawson9133
Жыл бұрын
Ditto... Bro 😎
Who knew that Ike's from cars and cameras was doing this before he started working on bikes 🤣🤣🤣
Done several of these over the years. Brings back memorys.
Whoa, I just took a quadrajet appart for a rebuild! Nice timing!
*_There is something satisfying about watching them rebuild something completely reached out..._*
I always hang my carbs upside down to check float level when they're in that position installed. It is a very important part as you said.
@MrTheHillfolk
4 жыл бұрын
No doubt it's important to check, new parts can change things. A lot of my friends play with small engines and always wanna get in there and adjust the float without knowing what it's supposed to be. It's running like crap, that has to be the problem right? In all my time I've never had to adjust a float on a small engine , unless a butcher has been there before. Fun to see what ya find on an automotive carb when ya open em up too. My buddy had a quadrajet carb rebuild by his girlfriend's father, haha he locked out the secondaries and my buddy never noticed 🤣
@CharredSteak
3 жыл бұрын
@@MrTheHillfolk part of the reason i have a love/hate relationship with plastic floats. Yeah they never go out of adjustment and barely ever leak, but goddamn do they get brittle after 40 years
“This paint is made for outside the carb only” doesn’t tape up carb whatsoever and sprays directly into ports
@ashqelon7267
4 жыл бұрын
It’s going on your car so they really don’t care. And once the air cleaner is in place you won’t see or be aware to notice anything until the 30 days warranty expired. And they’re still going to charge you for the “ Professional re-plating” of the body, an extra $375.00.
@Alex-gi2jr
4 жыл бұрын
@@ashqelon7267 lol
This takes me back 20 years. Awesome!
@latimbmdi3313
4 жыл бұрын
ض
Epoxy is fine for sealing the soft plugs over kill to drill & tap them. 25 year ago i rebuild the computer controlled version of this caburator then set and adjusted them for AZ state emissions.
Been building Q-jets for a while & You guys did a fair job but missed a few critical items. First off the Q-jet is a fairly complex carb w/real good metering aspects, the small primary bores will give your engine good throttle response at low speeds. After using one a square bore will feel mushy at low speed by comparison. Spread bore unlike any other? What about the Carter thermo quad? To remove the screws holding the throttle butterflies in place better grind off the part of the screw that extends beyond the throttle shaft or you will likely break the head off the screw & will have hell removing what's left of the screw. The end of the screw is staked at the factory to prevent them from backing out. I use a Dremel grinder w/ a small carbide burr to do the job. Screws for the bottom plug, 7/16" NF tap will work better. I have a length of 7/16" aluminum rod threaded to use for plugs. Base needs to be resurfaced on a large belt sander, they can be really warped. Same w/ the main body. The most common mistake owners make when they have a problem is to over torque the hold down bolts & warp everything. Easy way to check the main body for warpage is to look at the slots where the secondary divider plate goes. If they are wider at the top than the bottom then the main body is warped. I have a way of straightening this part but it is difficult & the process is too lengthy for discussion here. You neglected to cover the installation of the choke lever onto the choke shaft, a very frustrating process. On the chevy carbs the plug at the back of the fuel inlet is also prone to leak. Most times this can be corrected by driving the plug in tighter (it is a tapered plug) & re-peening the area around the plug. Lot of critical adjustments to make also, especially the choke pull off which controls the rate of opening for the secondary air valves. If not done properly the carb will bog at WOT or the secondary air valves will open too slow causing disappointing performance. You guys did a fair job otherwise.
@robertwest3093
Жыл бұрын
And the thick gasket they used under them made it even easier to warp them
Back in the day, my buddy was dating this girl whose father owned a shop. He had a fast gto but couldn't drive so well. So it's time to rebuild the carb, and he gave it to her dad. He rebuilt it , did a nice job too. Then he pushed the little lever down so the secondaries wouldn't open. A fathers gotta do what a fathers gotta do. My buddy never found out or even realized that he had less power 🤣🤣
@pattygq
4 жыл бұрын
The secondaries lockout cam. Accidentally flip it over when doing a rebuild and you're up shits creek when you jam on the gas.
Roaring like a lion "rawwrrrRRRR".. lol
@maxwelllevy5760
4 жыл бұрын
@Jason Henley I wanted to die as soon as I heard that roar to bud
@ditherdather
4 жыл бұрын
I was rollin, like whaaaaat did he just do?
@latimbmdi3313
4 жыл бұрын
تاتنتاغتنتابیبل
@latimbmdi3313
4 жыл бұрын
@Jason Henley ابژژسنژنینب
@latimbmdi3313
4 жыл бұрын
@@ditherdather نایهکبتبتلیتذ
man finding power nation on youtube has been awesome ive been binge watching all the videos lol
...and everyone thinking of rebuilding one of these just happens to have a blast cabinet.
@JustStayingGroovy
Ай бұрын
I know this comment is 4 years old... but please. You don't HAVE to use a blast cabinet. Carb cleaner and some brushes or even a cheap Sand blaster loaded with baking soda will work
Who likes them just for the the tha WOooom sound!
years ago the Holley on my 73 mustang mysteriously got damaged during the engine rebuild. my friend offered me a quardrajet cheeper than replacing the Holley. I was young and broke so I went with it. he installed it and tuned it.... it was a massive upgrade on that little 351w compared to the factory Holley.
@shiddy.
4 жыл бұрын
that was a very perverted part swap - did you just use an upside down holley adapter?
@christophersallee7904
4 жыл бұрын
@@shiddy. no they make a square bore to spreadbore adapterplate
@shiddy.
4 жыл бұрын
@@christophersallee7904 yep, that's an upside down Holley adapter plate
Actually they went to 850 cfm and i love Quadrajets. Used to make a bushing for the center also...worked wonders for tuning. You didn't need to put threaded plugs in it though. File down and then epoxy over the stock plugs and it good to go. Vinyl interior wasn't exactly "luxury" LOL and neither was the abhorrently bad fuel mileage
@GS455Stage1
2 жыл бұрын
Contrary to popular misinformation stated here is that the Rochester Quadrajet grew to 850 cfm. There aren't any production Rochester Quadrajets for the '65 to '74 model years, only 750 cfm and 800 cfm models. The 1975 thru the early 80s were completely different from the early models.
I had an old ponitac that was in dry storage for 12 years - put up on jack stands. 400 engine with Q-jet and a 400 trans. Gas tank was emptied and the radiator/engine block drained. After 12 years i rolled it out into the sunlight, topped off fluids, and installed a battery. I primed the fuel bowl with gas, turbed the key and guess what happened.....nothing. I had to file the points. After filing and the points the engine fired and ran on choke like it was just parked yesterday. When it got warm i bumped the throttle and it came down to idle. I drove it to the gas station to top-off the tank. That was 5 years ago and it still runs great. Even the accelerator pump works fine. I haven't made a single adjustment on the carburetor. I never understood the hate surrounding Q-jets. They are a great carb if you know how to work on them.
Edelbrock performer carbs are best for the street. Easiest to tune and they stay performing great for years to come. A well experienced holley tuner may squeeze a few more hp from a holley but good luck getting it to stay that way. I've had a performer rpm matched top end set on our 64 Malibu. The original 283 is in storage. It has a 350 4 bolt main high hp version with powerglide twenty years ago I took the double pumper and torker 2 combo off it. The edelbrock stuff has been performing flawless all these years. Use stabilizer when you're not gonna drive your stuff. It saves alot of headaches.
@markmartinfan62
4 жыл бұрын
Exactly!
This was a great first episode for me to watch of this channel. Liked and subbed!
Had a 72 Riviera with a Qjet and I loved it. Ran nothing but ethanol gas in it and I never had a problem with that car. Would sit sometimes for a month. Pump the gas pedal twice and turn the key and it fired up the first time every time!
I have a 4bl quadrjet in my 75 Chevy c60. Great carb
Instead of becoming a lawyer, I spent my youth fiddling with Quadrajet carberators and HEI ignitions making GM V8s run as though they were fuel injected -- idling perfectly, no surges or bogging, no detonation and good power and efficiency. I miss those days.
@hippitymcstribbs4906
3 жыл бұрын
Sooo whats the secret to getting crisp response from the secondaries? New vacuum break? People dont like that secondary throttle stop lever i hear, but some experts say leave the secondaries stuff alone.. tho i have heard of drilling 2 tiny holes somewhere i forget, maybe in the secondary flap edges? Really how about a performance tip, please and thank you.. I know i ran a 750 double pumper up against an unrebuilt qaudrajet same engine.. holley took it to task. Gotta at least tune the idle mixture screws for highest idle i know that much. Others have suggested the metering rods n jets.. but idk i never got that far.
My uncle rebuilt and customized my Quadrajet to be better then Holly. Apparently. Some of the parts he took completely off and left them off. It worked perfectly.
@kentbarger6974
4 жыл бұрын
I'm a retired mechanic I have rebuilt many Quadrajet carburetors carburetors and Transmissions are my specialty I can take the Ford carburetor and the Holley carburetors and it is easy to modify those carburetors to give you higher gas mileage I had a 65 Ford Galaxie 289 old motor 90 lb compression up to 120 lb compression pull a 5 by 8 trailer put about 100 pounds on the tongue of the vehicle and got 23 and a half miles to the gallon pulling a trailer going through Kansas and Missouri a big four door Galaxie 500 pulling a 5 by 8 trailer loaded never check the gas mileage with the vehicle only
If one uses a 72 jet & a 49 primary metering rod with a lite power piston spring over 20 miles a gallon can be had in the 396 & 402s. The 350 would get 24mph sometimes better with that set up. One would also have to tune the dist advance curve. Setting the secondaries for power one could enjoy both worlds mpgs & tons of power. The secondaries would take some drilling on some of the orifices & grinding on the metering rods. The Q jets were fun to work on to get max MPGs & Max Power. There was no other carbs that I built that could do the same.
@ashqelon7267
4 жыл бұрын
That combination would render a total of 0.00218576’ which is way lean for a big CI engine like that. I’de look to experiment and look at the plugs-monitoring the temps also as that seems too lean which might create excess heat issue on top of the lean fuel ratio it would introduce. The engineered spec chart call for at least a 0.0025000’ total fuel ratio mix for proper emulsification for proper 14.7:1 ratio for an efficient combustion.
@nFlames2
4 жыл бұрын
@@ashqelon7267 One has to take in to account the power piston spring. With different spring tension one can change the fuel ratio. If one is not familiar Qjets the spring is under the piston where one hangs the metering rods.
@ashqelon7267
4 жыл бұрын
@@nFlames2 Yes I known the pieces well
@jerrysmith9315
4 жыл бұрын
I am amazed at the knowledge required to rebuild a complicated carb ! Brain surgery has to be less complicated. So many small intricate pieces, and where to find exact sizes to place in exactly the correct way....my brain hurts. Seriously, are their real people that can rebuild a carb exactly correct ? On this planet ? 🤯
@nFlames2
4 жыл бұрын
@@jerrysmith9315 They are one of my favorite carbs. I was building them back in the 70's - 90's. Now the are far & few between. People are scared of them & buy the Edelbrock carbs, there ok just like the Qjet.
This channel is nice, keep it up
I miss you guys thank God for reruns.....
Love your show!! Please build 1970-1974 351C 2V. Simple stock rebuild. Only change, if it's '73-74, Make sure you get flat tops, go .030 over, like most folks. Use good quality rebuild kit. Yes throw an Edelbrock Aluminum intake on. New carb too. Rebuild stock points distributor, and run it!! Just like us guys, would have to do, because were trying to budget. These engines are quite rewarding, when right and tight!! Slip motor in to 71-73 Mustang/Cougar. Duals yes!! I think you would have a fun Realistic little build series. Please!
Now that’s how I want my 72 Monte Carlo to look
My C10 has a quadrajet. Not bad on fuel but decent on take-off. 20,000 miles on mine so far. I like it.
THANK for the great vid. I need to know what is the purpose of the criss cross line( like a checker plate )on the throttle plates of most of the carburetor like the ROCHESTER QUAD ? thank you very much
Ya need to grind off the flares at the end of the flap screws before removing...
A 327, Q-jet and powerglide.. amazing for the street. And my 68 Firebird would accomplish 26mpg, no emissions.
@racer67
4 жыл бұрын
Thats what my 67 impala is 327 quadrajet powerglide!
Man i love an old school buick and a well tuned q jet!
I had my dad tune my quadrajet on my 77 RS/LT Camaro in 87. It would light the tires up from a dead stop.
@MrTheHillfolk
4 жыл бұрын
My buddy had a girlfriend, and her father had a shop. Dude was an awesome tech. Anyways being a wiseguy , when he rebuilt my buddies quadrajet he pushed that little lever to lock out the secondaries...haha my buddy never figured it out.
@karambit8300
4 жыл бұрын
That’s what every boomer says
@hippitymcstribbs4906
3 жыл бұрын
@MrHillfolk what did he do exactly to that lever?
hey you forgot to show replacing the injection spiders. it wont distribute the flow to all 8 cylinders without them... good quick video though ive been contemplating on rebuilding the one i have but keep telling myself not to as its old and worn out. and converting to fuel injection is becomming affordable but this may be worth it to get my old vehicle back up and running again to enjoy next summer thanks guys.
Excellent video thank you very much
So the Monte Carlo was ahead of its time I never knew power mirrors existed back then and I never heard of auto leveling rear end
Love my old cars I got a 1968 ltd 2dr hideaway headlights I'm restoring its supose to have a 390 but it's got a 400m now witch sucks I guesse but it's got a 2barrel carb and the distributer shaft is stuck I'm trying to figure out the best way to get it to move freely so can time it properly and then hopefully find a intake and 4barrel carb for it and try get some big power out of it
did you use any gasket sealer for the carb gasket?
ran my fastest pass with an 800CFM Q Jet on my 396BBC
that 70 Monte is freaking 🔥😍!
Q-Jets are great carbs. Had a '72 C-10 Chev Step Side short bed bought in '85. Gone nearly 30 years later in '12. Still ran and drove. Anyways orig carb was acting up. Ordered a new one from a once staple speed shop thats gone now, sadly. This was '87 or so Kept the orig and this was rebuilt by a family friend, '94 or so. Dash pot failed on the new one '99 or so. Stole the one off the rebuild and warm idling problems were gone,,,,so was the auto choke. Heard 'klink' and knew something was amiss. Oh well, i just drove it for fun. Dang i miss that truck. Bit of a hot rod Stock with the 350, Q-Jet and a 3 speed. (old style slot mags and 275/60 R - 15 tires).
I plugged and drilled many air bleeds on them. Quick fix for warped base plate
I'll take a Q~jet for an off road application over any other make every time.
good video on basic rebuild but there are a few easy mods that should be done to improve performance like sealing the secondary needles with electrical tape and re-locating the secondary linkage to get rid of the full throttle bog when the secondaries open. learned this from an article in Hot Rod magazine 35 yrs ago.
Why would anybody criticize the quadrajet? It is without a doubt the best factory 4 barrel ever made. They rarely have any problems, and if they do, they're easy to fix and tune. I can rebuild them in my sleep... No need to drill and tap the plugs on the bottom. Just rough up the casting, and put your epoxy on. Most kits also have a sponge rubber seal to put in the baseplate to help with this problem.
@bertgrau9246
4 жыл бұрын
Kenny, I agree about the well plugs, I had one on my 76 caddy and even the small plugs were leaking. I found that by filling the fuel bowl with fuel and let it set over night the next morning I seen where it was leaking , and sealed them and the big well plugs with J.B. weld and worked great .
@larryhutchens7593
4 жыл бұрын
Those sponge seals rarely work for very long. Using epoxy alone will work for a while but the fuel will eventually attack it, especially the witches brew of fuel that is currently available & I'm not just talking about alcohol. The threaded plug idea is best since the fuel can attack the epoxy only at the end of the thread, takes quite a while to work its way through all the thread & cause a leak.
@larryhutchens7593
4 жыл бұрын
Those sponge seals rarely work for very long. Using epoxy alone will work for a while but the fuel will eventually attack it, especially the witches brew of fuel that is currently available & I'm not just talking about alcohol. The threaded plug idea is best since the fuel can attack the epoxy only at the end of the thread, takes quite a while to work its way through all the thread & cause a leak.
@larryhutchens7593
4 жыл бұрын
@@bertgrau9246 Use a blue paper shop towel & use paint thinner instead of fuel. Can spot the leak in just a couple of hours.
@kennydemartini2169
4 жыл бұрын
@@larryhutchens7593 I personally use a two part panel adhesive used for bonding body panels. It takes overnight to set up, but nothing will compromise that stuff. I've used it to glue windows back into the regulator tracks on old cars, and even glued a bumper bracket on a '56 Chevy that a customer had chromed without knowing the bracket was missing. I jacked the car up with his bumper jack the next day to show him it's strength.
Very revealing congratulations
stock Q-jet on a 350 is good for 700hp if you can tune them
Very good video! I need some advice on something. I recently bought an 1986 chevy truck with a V6 4.3. It has a propane system on it and the original carburetor is no where to be found. I have a 78 quadrajet that I just rebuilt and would like to install it. the truck intake manifold is the original four barrel spreadbore quadrajet carburetor set up. Also this engine has the electronic spark control distributor without the vaccum advance. if I put this 78 carb I got on it do you think it will work just fine?
I really need my carburetor rebuilt for my 1978 Chevy Monte Carlo 2bbl carb. Do you rebuild them for customers because I couldn’t never do it myself.
Also, did the rebuild really go this smoothly? As many as I have done there's still little differences that sometimes throw me off.
hi, I have an unusual problem with a quadrajet I'm hoping you can help with the return spring for the secondaries has broken - is there any way to fix or replace this part?
God bless these dudes # inspirational 😇
What did the carb get dipped in. Good stuff
It’s amazing to see how a rusty pile of garbage change into something... so beautiful
my Stepfather worked for Rochester Products for 40 years......the man didn't know much but by god he knew Quadrajets and Dualjets......
Woops you forgot all about the Carter Thermoquad.
Hey guys i had a quad in my garage for 3mths in a box. My throttles plates rusted shut. Pb blaster, soaked in rust restore, still locked. I dont wont to force it. Suggestions please?
I've always wondered what way that in the carb gas filter goes in , I thought the end with the rubber on it faced outward toward the gas line or does it matter ,does anyone know for sure ,idk
I've heard the Quadrajet referred to as the Quadrajunk and I have also heard a lot of people say if you get them set right they're the only thing to have
One of the best and most mid understood carbs ever developed
The Quadrajet wasn't the only spread bore carburetor I had a Thermoquad on my 340 Demon that was spread bore. If my memory is correct it was 850 cfm. The power valve if set properly kept bit from bogging from dumping all that fuel into an engine at low RPMs.
@jeanlawson9133
Жыл бұрын
I ran thermoquads a great bit they were awesome 😎 carbs... easy to work on too.
Back in the 80's it amazed me how many mechanics hated working on the Q-jet. I found troubleshooting, cleaning and assembling them was quite easy. I currently have a good old one in my garage that I should sell, if anyone was interested. :-)
@ya472
4 жыл бұрын
I tuned a Q-jet for my 327, 11:1 domed, and 194 double bump, in a 1968 Datsun pickup... hit 3000 rpm and hang on for dear life. so much fun.
Use an acid to neutralize the alkalinity. Then mix up an alkaline to neutralize the acidity. Next, use an acid to neutralize the alkalinity. Then mix up an alkaline to neutralize the acidity.
@Eddie2425
4 жыл бұрын
And be sure to wear protection..lol
@ashqelon7267
4 жыл бұрын
Which one to we ingest First?
I had one on a 1970 GTO when those secondarys open up better hold on with both hands.
Been there done that I can’t even count how many times.
Also, when tapping out the pin for the accelerator pump lever, remember to have your best curse words handy for when the whole dang piece snaps off.
my 85 Dodge Diplomat came with a q"jet
It is funny how many people hate the quadra_junk carb. My buddy had one on his cj-5 on a fairly healthy 327 and it was the best carb he ever had. Worked better than fuel injection/ Never sputtered when wheeling and got 30 mpg on the road. All on a 400hp+ 327. It would actually pull wheelies on the street NO JOKE!!
@Laffy1345
4 жыл бұрын
Older the better.
The Carter Thermo-Quad is also a "Spread-Bore" carburetor...
Have you guys never heard of Weber carbs they made progressive choke carbs as well and very popular they are /were as well but guess mainly in Europe?
Hi, whats the carburetor paint you used? Do you know if this paint doesn’t remove with fuel contact? Thank you
It's amazing how complicated carbs were.
@latimbmdi3313
4 жыл бұрын
هاباخمیکیغکبیلنت
@latimbmdi3313
4 жыл бұрын
کنتتع
That spider is a Brown Recluse. I have a couple videos showing them in my shop and home.
I worked in a tuneup shop we built so many carbs. For the people that thought quadrojets were bad. Try building a computer controlled mikuni. Or a ford variable venture those sucked. Then on holly’s you put chapstick on the power block gasket. So they wont stick. And after it fires up and runs for a bit you shut it off and operate the accelerator pump til it primed. If it ever backfired pull it apart you just blown power valve
@larryhutchens7593
4 жыл бұрын
Holleys were originally designed as a marine carburetor & have a fairly primitive metering system. The power valve thing was a problem on Ford Motorcraft carbs as well.
@robbiefrentz9427
4 жыл бұрын
Larry Hutchens I agree just didn’t want to rock that boat. Lol. What I hated with ford 4 barrels were when you were. Marrying the top and main basis. The accelerator pump check ball tends to pop out of its location and fall down into primary wells only to fall into engine. That totally sucked. You learned to. Operate it outs installation. Before hand....
The Monte Carlo was built on the Chevelle station wagon frame the doors rear window and trunk lid were the same as a Chevelle
Have a problem with the secondarys kicking in dumps in fuel and run extremely rich. Primary's no problem. Any ideas?
@bertgrau9246
4 жыл бұрын
Two things, if you look at the air valve there is an adjustment on the side you can adjust the spring to come in slower. Another thing there is a plastic cam on the air valve if it's lifting the rear metering jets too high that could cause your problem. It would be easier to put larger diameter metering rods in first that will help lean it out. First check what you have then go from there. The good thing about the secondary's they are really easy to change out no major tear down needed
Suelen tener desgaste los jets y las agujas primarias con el paso del tiempo?
Ah, yes. The "Quadrabog", so named by people who didn't know how to tune carburetors...
@maxwelllevy5760
4 жыл бұрын
Ah yens American knockoff vtec
@177SCmaro
4 жыл бұрын
@@maxwelllevy5760 Wut? Hey, you know, if you want to take another crack at that one go ahead.
@maxwelllevy5760
4 жыл бұрын
@@177SCmaro well economic at low speeds and calm driving, fast at aggressive driving, I think I'm right
@sprsprtrudy
4 жыл бұрын
@@maxwelllevy5760 think you're backwards there bud... Qjets outdated vtec by quite a few years... Lol
@maxwelllevy5760
4 жыл бұрын
@@sprsprtrudy chief I think I know that
if Tommy is sellin it , im buyin it
Cadillac used the same style as Chevrolet. Instead of removing the main well plugs just put epoxy on them. It will do the same thing. He also put the fuel filter in backwards.
@justinriley8651
2 жыл бұрын
lol 😆
When I used to rebuild carbs I would slab the throttle shafts and grind down the attachment screws so that there were no screw shafts protruding into the airflow. I also would taper both side edges of the throttle butterflies at WOT so as to smooth airflow in that area. I had a set of ultra-small titanium drill bits that I would use to drill out the jets to precisely calibrate the AF ratio. If I went too far in drilling out a brass jet I would heat up the jet and fill it with solder and redrill it again.
@hippitymcstribbs4906
3 жыл бұрын
Slab the throttle shafts?
@videomaniac108
3 жыл бұрын
@@hippitymcstribbs4906 That's grinding down the circular cross-section of the shaft on the opposite side of attachment of the butterfly plate. The grinding would flatten the circular area parallel to the plane of the plate. This reduces airflow turbulence over the shaft and increased the flow area, less restriction.
@hippitymcstribbs4906
2 жыл бұрын
Ummm, ok. Thanks, i think. Seems legit
@videomaniac108
2 жыл бұрын
@@hippitymcstribbs4906 It worked, whether you believe it or not is unimportant.
@hippitymcstribbs4906
2 жыл бұрын
I didnt say i thought it did or didnt and you're right it don't really matter much i suppose whether i do. Just meant to infer it was still somewhat confusing what to do but i got a good idea i think. Hope it helps someone thanks
I never ever had any problems with any quadajets I used, except the ccc electronic mixture carbs. Now the Carter AFB on the other hand? Nothing but problems. Replaced it with a Holley 650 and all problems were solved
@kennydemartini2169
4 жыл бұрын
Agreed. Best carb from the factory, and easiest to tune. Even Dodge used them on their 360 trucks back in the '80s
Unlike any other? You forgot about the Thermoquad. They were available in 1000 com units in the 70’s. Both are great carbs. Both are misunderstood. To make a quadrajet sing get the book written by Doug Roe. He tells you how to drill out the emulsion tubes and select the metering rods , jets and and rod forks. GM made several different metering rod forks and it’s worth getting a few to tune with. If you need to you can drill them out, but figuring out the proper height might be difficult. The reason for the long hood on the Monte Carlo, Pointic Grand am and the Cadillac Elldorado was that GM had planned a V12 for future cars. But the EPA stepped in and prevented that from happening. Imagine what could have been if....
I run the car maintenance KZread channel in Korea. I'm always learning such a great ideas on your channel. I hope we have a chance to be together. Thank you.
does carburetor give you more power then fuel injection i have a 93 dodge Dakota with the 318 it's fule injection now
@theguy9234
4 жыл бұрын
No it doesn't. Unless the injectors are worn out or small
@jordanwiley4582
3 жыл бұрын
it does typically but usually only in super race applications and the difference is negligible. it all comes down to what you're gonna use the vehicle for.
Hey guys what happens if I back my fast idle screw out all the way and it fell out ?? Do I just crew it back in or is there something in the back that it has to screw into 😩 my Choke isn’t closing now !!! Help someone is there something else it has too screw into ?
Hey Tommy Boshers looks a little younger in this series.
Sweet
You missed a very significant step in the "idle tubes" fuel passage ports clean & part replacement. For one, they almost always have hard build up on the bottom them that only removal by with using and some sort of tool to scrape the fuel deposit calcified build up, off the small hole fuel pathways openings. Second , the "Cliff Ruggles” trick of enlarging the tubes to a “known” chart diameter rendering different flow ratio, to make the emulsifying dynamic most efficient in the idle screws adjustment. And to help add the needed fuel for bigger camshafts. Pontiac's OEM setup are better in this aspect yet the vital step to enlarged them, definitely benefits every engine typically. Rendering Better fuel ratio mixing, And primary control circuit sensitivity~adjustments setting, etc. I performed this task on my Q-Jet and it is every bit as snappy all around response and performance of my Honda Accord EFI is! Completely reliable and efferent form Idle to WOT. And not to overlook the secondary flaps spring tension adjusted. To make it open earlier and easier under the vacuum to alleviate the Classic Quadra-BOG secondary Hit they are down for. Simple but affective. Good grief guys, mention this stuff in about 2 more minutes of teaching there, it is very informative.
Every butterfly bolt I have seen is peened on thread end. And needs to be slightly ground with mini wheel or the bolt will shear off.