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Simple Carburetor Replacement for Chevy 235?
I have a 58-62 vintage 235 in my pickup.
Have had nothing but problems with carbs since I bought it 2 years ago. Always need to run with the choke partially on. Rochester 1bbl. Bought a rebuild kit, accelerator pump didnt match. Bought a second carb, same accelerator pump as the first carb, so no dice. Second carb runs a little better, but still need the choke on. I also have an adaptor to a 2bbl, but not a good carb. Is there a new single barrel that I can bolt up and get decent results? Should I just go to a 2bbl, if so which one and from what vehicle. This is a short term deal till I get my V8 in, so not looking to spend a ton of money or effort. |
Re: Simple Carburetor Replacement for Chevy 235?
Find a rochester 2GC, very bullet proof and easy to rebuild. Rebuild kits are readily available. I sold my stash to a Olds guy that was looking for parts carbs for his tri-power setup. Smaller Holley 2bll (not a 500 cfm but smaller) would work too. I had those on my VW and Mazda, once you get the jetting right they do well too.
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Re: Simple Carburetor Replacement for Chevy 235?
What vehicles did that come on?
Aside from some air leaks (interal to the carb, or external to the intake manifold etc), is there any reason why mine might not just need a jet drilled out on my current one so I can run it without the choke on? |
Re: Simple Carburetor Replacement for Chevy 235?
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Re: Simple Carburetor Replacement for Chevy 235?
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What excatly is the jet, #14?
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Re: Simple Carburetor Replacement for Chevy 235?
No. Its #17. There is a number stamped on it. It is usually about 55-58 on 235. Sometimes the rebuilders guggle parts & you wind up with something from a 216. Increase it 2-3 steps at a time till it runs right.
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Re: Simple Carburetor Replacement for Chevy 235?
The jet in the first carb was a 58.
Second carb is on the truck, so I will have to pull it off or at least apart to check. When you drilled yours out, did you notice it helped across the whole throttle range? Did it have any negative affects? |
Re: Simple Carburetor Replacement for Chevy 235?
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Re: Simple Carburetor Replacement for Chevy 235?
Found on inline 6 or v-8 engines or both? Is a car one or truck one any different (mechanical vs heat/vacuum choke etc)?
Going to try drilling out the jet on my current one when I get around to tearing it apart, if that doesnt work then a 2bbl will be plan B. That adaptor on the left looks a lot like the one I have sitting in a box. |
Re: Simple Carburetor Replacement for Chevy 235?
If you have to keep the choke partially on to have it run that is often an indication of a vacuum leak. Is the hose running from the engine to the windshield wipers in good shape? A crack in it or a leak at the wipers could cause a problem.
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Re: Simple Carburetor Replacement for Chevy 235?
I capped that line off and there was no change, but I have not tried the start fluid trick on the whole intake manifold yet to look for other leaks.
Could be a leak in the carb too I would assume. I took the auto choke off and put on a mechanicl conversion kit (the $10 auto zone universal one), not sure if something with that vaccum line for the old choke needs to be capped off? |
Re: Simple Carburetor Replacement for Chevy 235?
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This is not a substitute for some thing wrong. Make sure your float level is correct & the accel.pump is working. |
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Take a look at this link http://carbkitsource.com/carbs/tech/...Jet-index.html |
Re: Simple Carburetor Replacement for Chevy 235?
On my Single Rochester.
When put the carb on last year, I took off the auto chock and hooked up a cable using auto zones univerial kit. There is a steel line that goes from the bottom of the carb (numbers 4 and 42on that carb parts breakdown I posted above) to the area where the choke was. Last night to look for any air leaks, I sprayed starter fluid all around the intake and carb while running and the only place it made any RPM difference was if I shot it at that plastic cap for the choke adaptor. Do I need to seal this metal line off? |
Re: Simple Carburetor Replacement for Chevy 235?
Put a vacuum guage on your carb and see what you are reading and try to get the highest reading possible check all openings on the carb and see if if you can get everything sealed uo except the line to the distributor, vacuum advance must be working
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