Will a new $150 "knock off" Rochester Quadrajet Carburetor work? Let's install one and check it out.
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- Опубликовано: 20 окт 2024
- I install a new $150 "knock off" Rochester quadrajet 4 barrell carburetor on my Chevy 350 small block that I bought off ebay. Will it work? (not sponsored) Honest review.
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With a little tuning these ChinaJets work very well, used one on a 500 Caddy .
Quadrajets are a great carb and easy rebuild, lots of information, books and support out there.
Glad to see someone with as much junk as me in their yard, only I’m in to old Trans Ams. Always carry a fire extinguisher in them old carbureted cars.
Have your cat quit smoking. Since my cat quit nothings caught fire since then.
Quit running holleys no more fire in the hole.
yes on the floor in the back seat.
Two known but very fixable issues with Q-jets are the foam float, change that to brass and set the level cost $10.00 or less, and another lesser known and also very fixable issue is the well plugs between the throttle plate and the float bowl, remove the old press fit lead ones and install the repair kit (cost less than $10.00) with two aluminum plugs with O-ring seals and problems solved -- the Q-jet is an excellent carb if youre familiar with how to sort them.
I'm 74 years old and I've been rebuilding carburetors for people forever and quadrajet thermal quads Holly's I'm the only carburetor guy left in this particular town here in Texas and even a Snap-On tool that says hey you know what you're the guy the only guy we got left to that rebuilds any kind of carburetor you can bring in I still still doing make modifications to him also and yep yep yep I don't have any more years I'm going to keep doing it my eyesight starting to have no problem
I'm in Florida, grandpa started showing me how to rebuild one barrel carbs on tractors when I was 8 now 70+ still enjoying working on them. It's not hard if you understand how they work. Rebuilt a lot of Quadra Jets. Nothing kicks in and sounds better than a Quadra Jet. Keep on rebuilding them.
Almost every marina has a carburetor guy who can rebuild any carb
I ended up with a box full of them when my step dad died. I'll probably sell them for cores at a good deal to someone that rebuilds them. Maybe someone can use them for the parts. Lol The truck I inherited needs one so I might invest in one of the knock offs and get it running and start on the body work it needs.
Hey there Larry, I'm 74,, and I'm the only carb rebuilder around here that I know of, and the quadrajet is the easiest to overhaul, the last one i did, when the guy came to get it, I told him, not to touch the adjustment screws that they were already set right, and that it would idle at 750,r p m s,,,,are you sure he said,,, just don't touch them and you'll see,, he called and said how much do I owe you,,,,, I said it's on the house.
Rock on daddyo.
I been running the Chinese knock off motortcraft 2150s on my fords for a few years. I’ve had real good luck with them.
Does anyone make knock off smaller Holleys? I'd like a 390, but they're expensive
@@jimeditorial I don’t know. I’ve never had a Holley. Sorry I can’t help. Maybe someone else will know.
Should put throttle return springs on like the factory had them. Connected to a bracket across that mounts torear carb bolts and the springs connect to the bottom of the throttle lever below the throttle shaft and pull straight rearward closing the throttle, The way you have it way out board will cause premature wear on the throttle plate bushings and invite the possibility of the throttle sticking full throttle if it cams over the pivot point with the spring at a angle
It actually puts less wear on the bushings the way he has it.
Nothing like having a new carburetor.
A fellow shitbox enthusiast with jeans that look like hot garbage. This is my kind of youtube channel. Thumbs up!
Thanks
The real test is to see how the secondaries open up when you tromp on it.
Exactly…
Yeah, where is that video?
Or don't in the case of many previously monkeyed with quadrajet problems vehicles I've gotten ahold of over the years and figured out most of them...
Ya rite but it did by hand
Put a sheet metal screw in the linkage at a place that works ans it turns a vacuum secondary int mechanical secondary quadrajet
Good morning clunkers classics and cats 😉 it's nice to see that carburetor worked out for you Lee. It sounds really good. Keep up the good work and the cool videos 👍✌️🇺🇲
Thanks 👍
Glad the carb worked out for you. It's 60 year old technology with no electronic parts and by now I'm sure the knockoffs are OK. Did you notice any weight differences between the carbs and the knockoff being lighter?
about the same weight
Are u located in Texas
So how is it going so far with that carb? I’m going to order mine today? Any new issues? Smoking anything?
Older quadrajet chokes were always in the intake manifold like yours, finicky to adjust but not that hard just WATCH VIDEOS on Q-jet rebuilds and you'll be surprized how easy they are to work on, I was rebuilding them when I was 16, I just bought me a manual that covered all the carbs from my era (im 64) and learned that way, I didnt have the internet and youtube and the internet, its even easier today with the internet.
The Problem with one of these "replacement" Carbs, is what was Fuel Delivery Curve set up for? The Q-Jet was offered on tens of thousands different Engines and HP ratings, and few had the same Fuel Curve
If the Choke is NOT opening Fully, the Secondaries will be locked out, so your Bimetal Choke, with the Welded Link is Questionable. The Old Carb looks like pre 1975 chevy, Calibrated quite Lean, and all the Jet changing in the World isn't gonna Richen it much, in regards to its tip-in Delivery. Some serious rework of the Non-Service Parts of the Fuel Bowl need recalibration
The 'New' Carb has an entirely different Choke Mechanism, far less sophisticated
The Idle Solenoid, wasn't just used on A/C cars, it was often used on non-AC ones to prevent/reduce Dieseling when the Engine was shut off. In the early 70s, lean Idle Mixtures combined with retarded Timing, required a greater opening of the Throttle to attain Idle Speed. When the engine was shut off, more air and thus Fuel was still moving, and the Higher Temps from the Forementioned Parameters would often result in the Engine kind of continuing to run without spark. The Solenoid would shut the Throttle in an Attempt to Starve the Engine of gas-air
Big difference on the Linkage between the Primary Shaft and Secondary Shafts, Angles are different too
It seems to run not too bad, out of the Box. It will be interesting how it runs at higher Speeds, keep us informed
I was kind of in the same school of thought. You get what you pay for. The most interesting thing I noticed was that the throttle shafts 'appeared' to have the same OE style green Teflon coating. But I wonder. Is it REALLY Teflon or just some imitation green paint or coating. Most Chinese knock offs copy the 'look' without duplicating or understanding the function behind the engineering.
That Aspen RT super coupe has my mouth drooling 🤤 we had one bought new in 78 and my brother fell behind on payment. I've looked for one to build since. Very nice cars. I had a 77 nova rally that I raced. Great cars
Hey Bud thanks for the video I have a 1978 Chevrolet c10 Scottsdale I was on the fence about buying a original reman quadrajet for 485 dollars can't afford it so I bought a on eBay and it works great. Thanks for the video.
cool
Good deal on that carburetor. Just bolt it on and go! Sweet! Thanks for sharing that!
I'm glad the Carburetor worked out for you I know a lot of time hit and mess with all that kind of stuff my only concern was You Pouring that gas in the carburetor with a cigarette in your mouth We all know a cigarette cannot ignite gas But one spark from it can being a mechanic myself for over forty years Sometimes we do things so repetitive.We don't think We get so relaxed That's when we hurt ourselves Take care
awesome work lee im glad the carburetor works excellent have a great weekend you and nikky
Thanks
I have a Chinese knock off ford 2 barrel works great did have to grease gaskets on power valve plate. Other than that small leak. Works great.
One thing it still does some awesome burnouts
With these new ethanol fuels have to see how it holds up.
Not well. Hard to tell what that one is, but the OE QJ's and Holleys were cast zinc, most of the Carters were aluminum. Neither one hold up really well with the new fuel once they absorb water. It's the water that kills them. I would have went with a TQ or the Demon TQ knockoff 'Street Demon'. Those all metal carbs hold too much heat for the ethanol.
Well, ethanol in fuel isn't exactly new at this point🙂. But, I have 5 70's GM cars with original Q-jets that I rebuilt. Been running them for many years, from 10 to 14 years since rebuilding them, 2 as daily drivers, the others I run at least once a month to keep them exercised. I used rebuild kits that come with ethanol resistant seals, like the accelerator pump seal. So, I drive my old Q-jets regularly and haven't had a problem with ethanol. They are all I have and drive, and they've been dependable. I have no need for a late model vehicle. The ones that sit longer between starts sometimes take more cranking to get fuel to the bowl, but they eventually start. If his new repro Q-jet is as good as my old rebuilds, it should be fine too.
Always a good & entertaining video Lee I love the 78-87 El Camino My friend had a 78 he put in a 327 I had a 80 I had a Mr Goodrench 350 put in mine
Enjoy your channel alot.
My brother purchased a aspen super coupe new and it was one of my all time favorite cars. The wheels are the best looking factory 15x8 ever. Wish I could get one.
i have rebuilt over 1000 carbs 500 of them qjets , made some from 3 or 4 parts carbs about 75% worked fine they have very finicky needle and seats warped air horns stripped inlets shot throttle shafts, i think they are good for mileage but for ease and value very hard to beat an edelbrock performer (used) i have had good luck with holleys too as long as you replace all gaskets and needle assembly , imo qjets are a pita to deal with but when you have 5 gallon buckets of them you use what you got. i'm sure that new one worked better than rebuilt ones.
Personaly I like the Q-Jet because its really easy to tune and modify. Until you get an old one that isnt right... That can take a man down "The rabbit hole"...
Great that it works,hope it lasts!
Quadrash!ts we’re actually great carbs, yes very tuneable. There downfall is usually attributed to the small float bowls. Bowls could be sucked dry faster than they were able to refill in a performance application, fuel starvation in cornering, and acceleration applies. Rebuild, check float level & keep orifices clean. Accelerator pump ok? Check fuel pump output. Go enjoy.
Love the cat's assisting you.
Those primary throttle blades should be perpendicular and not moving around as you accelerate. Something needs tightened?
Two thumbs up to you Lee. The black beautie is running like she should.
Thanks
I bought one from Amazon for my 68 Deville but it was a bit of a dud and would diesel. I returned it and bought an Edelbrock instead. It's nice to know that the problem was wish mine and not all of them.
sounds like a timing issue
@@clunkersandclassics Yes, and if his engine has a high compression ratio, which is likely in a 68, and he wasn't using Premium, he would have needed the higher octane Premium fuel for his engine.
Good deal! Thats a feisty little El Camino now ! lol
I had my 1979 Q-jet restored to better than new at JET Performance Products in Huntington Beach, CA. I went with their Stage Two Performance build. When I opened the box I was blown away by the quality service that totally restored my Q-jet to better than new condition. Simply amazing with a simple reinstall of my original carb as it was when I removed it from the engine. I was cautious to make sure I received my original carb and not some off the shelf rebuild by taking detailed photos of my carb ID number before I shipped it to JET and sure enough I received my original carb back from them. NO Games Played! So how did it work you may wonder, One word defines the results, PERFECTLY! Starts immediately, warms right up, NO STUTTER or BOGGING, PULLS HARD AND SMOOTH FROM IDLE TO FULL THROTTLE! My 383 Stroker loves it! So do I. I don't miss one penny of the $450.00 I spent for this restore by JET PERFORMANCE PRODUCTS. Ronster
This $150 carb is for people who don't want to spend $450 for a rebuild or buy a new name brand carb. When you spend 3 times more for parts building a car then you end up putting $30k into it rather than $10k. Makes a big difference between a profit or big loss when it comes time to sell.
Nice I have a 78 ss El Camino I just dropped 150 on a mock carb hoping to get mine up again
Glad I watched this because I just ordered one from ebay, just to get a rebuilt 283 going for first time start, but if it continues to run well I will keep it on, yours appears to sound real good actually specially for a knock off.
Had qjet on a 283 and it did okay. Gave 14.5 inches vacuum at idle. Installed a holley 1850 using an open adapter plate and got 15.5 inches vacuum at idle.
If your having driveability problems after the engine gets heat soaked. It may be a problem with modern gas. It's not made for carburetors. It boils away easily. You could try a insulating spacer under the carb.
Cliffs high performance will talk you through the fixes for those problems. Once you know, they are easy to work on. There is a spring for the secondaries, and a cam it rides on, repairable and adjustable.
$850 to get a q jet rebuilt/renewed here in Perth w.a. only 1 guy willing to do it.
I've been looking at these carbs on Ebay and Amazon lately for my '68 C10 pickup. I figured that i would do some research before committing to one.
Got mine on my sbf with the adapter took a few test drives works great only thing is i had to tie open the choke because i don't have that intake part for it. Just a little hard to start but once warm it works great.
Them ol Rochester carbs will suck the paint off the hood not bad for what you paid
I want one of these Chinajets so bad for my '79 Chevy Van. I've been rotating 3 ancient Q-jets and their parts for the last decade and I'm tired of it. An all aluminum fresh start would be awesome.
buy one then
Nice carborater it sounds great!!!!
Thanks
Glad it worked there is a lot of hate out there on the chinese quadrajets. I ordered me one gonna try it next week on my Small block ford.
I prefer a q jet over almost any other carb. I've used them on my daily for better fuel mileage and I've used them on my drag cars and circle track cars I've built.
Great carbs when tuned well
I can fix that carb. Had a 71 Buick GS455 back in the day. I was a quadrajet master. Use to have a bunch of different hangers and secondary rods. It's a pretty simple carb really.
Put one on a Pontiac and the jets were way to big, ran rich. Pulled the jets and put the next size down and still running rich but better. The next size down provided is way too small. So still pondering whether I track down some smaller jets or give up on it.
Wow interesting. I saw these only $150. Then found this video. Cool
Working good ... Well in the lawnmower world all the cheap carbs work just as good as oem
I bought the knockout for my truck and it literally caught on fire every time I tried to start it. Not just a lil spark it caught on fire and almost burned my truck up. Put the original Rockchester back on and it worked fine again.
strange. mine is working fine still.
You got yourself a good one bud if you get a good Quadrajet man it'll do you write that one it's good
Sounds great Lee! 😉✌
Thanks
I got one it was great on the primary but kick in the back two and falls on its face i have adjusted the top butter flys with no help i went back to my old carb and throwed this one in the corner of the shop oh the old carb just has a stumble as the back two opens and then gos like a maddog and return was a hassle
That a/c solenoid is also an anti - dieseling solenoid that shuts the throttle body when you turn the engine off because of smog they ran lean and had to open the throttle more to idle. probably doesn't apply for you just fyi.Not sure how I feel about a china knock off but I love q-jets it seems to run good. wish they had an 1100 cfm q-jet or a dual manifold for a big block chevy cause I'm stuck with a dominator, no fuel economy at all.
Done lots of quad junks pretty good carbs
Rochester carburetors have vacuum operated secondaries you can't get them to open by just stepping on it without driving it.
sure you can
How is this carb holding up?
Yeah great good job on the 1982 El Camino runs better
runs great now, no more idling and stalling problems
What irks me is why nobody can build new Q Jet style carbs; even in Mexico, for double the price point of Chinese versions. Reman versions start around for around $400 USD. Even your cats approve :)
Hahaha! I just saw an ad in the middle of this video for an electric car!
What about the TV cable did you connect that and see how it ran how it shifted? If I was you I'd get the old carburetor rebuilt.
My experience with the knock-off carbs has been that they work okay, but they use inferior metals that immediately start to corrode after fuel is introduced. They're built simply by the parts designs being copied but with no functionality being researched or considered.
Quite simply they copy and assemble the different components with no idea what they're meant for... They work but they're never quite right.
Qjet great carb for lower hp uses. If you are making big hp you will probably suck the bowl dry if your fuel system is not perfect.
I seen them on Amazon for like 300 bucks! I’m Canadian lol Ima get one, figured it was too good to be true
Good informative video. 👏. Thanks,
You need better Kick down bracket.
Quad is a tought rebuild.
Excellent give us some feedback over time cheers 🥂 😊
EVERY SINGLE TIME I'VE ATTEMPTED TO REBUILD A QUADRAJET CARBURETOR! THEY HAVE NEVER WORKED! I'M NOT SURE IF IT'S ME! BUT IT MIGHT BE....
It can take some studying. The "How to rebuild Rochester Quadrajets" book by Cliff Ruggles, along with his rebuild kits, helped me successfully rebuild my own Q-jets, if you ever want to try again.
Is the carb still working good? I just got one in today gonna try it.
yes
@@clunkersandclassics awesome these chinese carbs get alot of hate. But I say if it works it works. Can't wait to try mine.
@@clunkersandclassics got mine on got it to idle only thing that I had to fiddle with was the spring on the secondary air doors. I adjusted it and they open now. Can't wait to test drive it.
You think it will work on a stock 88 454?@clunkersandclassics
thanks for video
Cheap carby changeover , saved hundreds , cheers
Hey Bud I just got the carburetor in from Amazon and I put on my 78 350 pickup and fuel just poured out of the top of the carburetor. Can you please tell which seller did you get from on Amazon. Thanks
Sounds like you have too much fuel pressure. I've bought 4 since this video, all off ebay. I can't remember sellers names.
I rebuild your old one for you I worked in GM dealership and rebuilt somany of them
Hey Lee, can ya post the eBay ad no. For the carb ? I need that exactly same carb. Thanks 👍
go to ebay and put in rochester quadrajet, a bunch will pop up
exact heading is: Rochester Quadrajet Carburetor For Chevy 350 400 427 454 750CFM 4MV 4 Barrel
Buy a carb with a proper choke not this useless heat riser intake crap
good luck with your carb
My god had a friend in Georgia middle school. Same type land cars galore. Brings back memories real american mentors in this country. Anyways would love to buy the long cool woman in a black dress. Let me know.
Here to support
3 turns out at least on the idle mixture screws
Sounds good to me 👍🏻
Scan ass for no better than that but for a 150 bucks I tried one usually they squatted us when they were right they were right forever
90% of fatigue problems with the Quadrejet is throttle shaft wear.... therefore sucking air and interfering with the air/fuel ratio.....
Yes, and as you probably know, it's the throttle shaft bores in the carb body that wear, not the shaft. There are throttle shaft bushing kits available from q-jet parts suppliers (like cliffshighperformance) to fix that problem. I do it on all my q-jet rebuilds.
Mine worked ok for a while. Then the throttle shaft bushings started leaking all over.
What is it with Smokers getting close to things that emit Gasoline Vapours?
Is that you uncle Tony??
Confidence Bud! Confidence!
Have you had any long-term issues with your new "knock-off" Rochester Quadrajet carburetor? I have, and they've been very disappointing.
I bought one of these carbs off of Amazon on March 20 to replace the worn-out Edelbrock that was on my 68 C10. After watching a few videos on these knock-off carburetors, I figured that I would take a chance and try one out for myself. I've been rebuilding engines and carburetors ever since the 80s, so I've seen quite a few over my lifetime. At first, it seemed that the new Q-jet would work just fine, but I was wrong. It won't stay idling until the engine has warmed up to operating temperature, despite all of the tuning and adjustments and engine timing that I have done. Plus, if I let the truck sit for a few days, all of the gas has drained out of the fuel bowl. The well plugs are leaking. I have to prime the carb in order to get the truck running. I've got up until April 20 to return the carb. Thanks to these issues, I'll be returning this carb and going a different route.
I haven't had any problems from mine but I don't drive it much. I have to prime all my cars after they sit awhile. There is a bunch of different manufacturers of these carbs so all might not be the same.
the fuel evaporates out of the bowl thats the hard starting issue with carbs after sitting for a while!! put a cup of gas in jar and its gone overnight its the alcohol
Bushings in the butterflys worn out, allowin it to suck air.
OH Lawd! you spilt a months wages worth of guzzoline on the cardboard.;)
When it gets cold, put that solenoid back on… with it on , with or without the heat stove / riser , the engine will
start easier …
That solinoid is for air conditioning. All it does it raise rpm when compressor is on. It litteraly does nothing else what so ever.
My 1973 Nova SS w/ a 350 v8 Quadrajet has that solenoid and has never had AC since I bought the car in 1973… my car is a 4 spd… the plunger rod physically pushes the primaries open during cold weather starts til the heat stove/ riser kicks in…
Chinesium! From the Shanghai Speed Shop
Cool
Excellent
Building a Qjet is so so so much harder than rebuilding an engine.
I don't understand the problem with rebuilding these. They are not that complicated. It's odd that this video came up while I'm rebuilding one for my boat. Takes me about 2 hours to disassemble/clean and reassemble. And I've done like 20 of these total since 1987 when I did the first one. So I'm not a pro, they are just not that complicated.
The problem with those Chinese carbs is they will usually work great-for a little while. Then they usually start to develop issues. Watch UTG, he did a video about them. They are not anywhere near as good as the original. But you get what you pay for. And $400 isn't squat to spend on one of these old cars. It's just not a lot of money anymore.
This video is for people that can't rebuild one and don't want to pay someone to do it, have no carb to begin with or has one that's been deteriorated beyond repair. It's a cheap alternative to get your ride back on the road quick. And $400 is a lot of money to me and this channel.
@@clunkersandclassics All I'm saying is a $15 rebuild kit is usually a better way to go than a $150 Chinese knock off. The quadrajet comes apart in 3 main pieces and there's really not that much you have to do besides cleaning and keeping track of your parts. You're really only replacing like 8-10 pieces with a rebuild. There's one tricky section with the upper gasket to the air horn during reassembly, but that's it. And there's a ton of Q-jet videos on Y/T. Like I mentioned, if you watch UTG on this very subject, the knock off will usually disappoint you before too long. It's trading one problem for another.
Why is it when people pick up a quadrajet they want to turn it upside down
You have many Al Pacinos now.
Awesome
Carbs are still *much* cheaper than the efi kits currently available.
Sweet
The first old carburetor, anything could be wrong with it, Missing parts to not adjust right, Back when we had carburetors, everybody was rebuilding them, China Junk works, made the engine sound great,
cool cats
Hows it holding up ???
still works great
@@clunkersandclassics ya just installed one workin good so far . I call 71 impala the China clipper now lol