VCCA Home Forums TECHNICAL - 1945 AND EARLIER 1929-1932 1929 Carb adjustment

I have a rebuilt 1929 engine, it's missing and running rich
plugs have black silt no brown.

I have ordered new plugs but want to look at the carb
I had adjusted the float to 3/4 of an inch.

Any ideas ? what would cause the car to run rich

how to you have the gap & timing set ??

I had mine set up on the recommendations of fellow VCCA:
...Point Gap/ Breaker-Contact Separation: .018"
...Spark Plug - Gap: .040" AC Delco C87
...Timing, Spark Advanced: 18 Degree BTDC

I also set my idle per the IOC (Instructions for the Operation and Care) 1929, starting on page 37. and/or the Chevrolet Repair Manual Series AC-LQ Page 112

Done all that however I am switching to auto lite plugs 388
have you adjusted the float? I set mine to 3/4 inch will be rechecking as I told if the float is too high it will make it rich? What do your plugs look like after running? Mine are soot black, something amiss and I don't know what else to look at
in the carb.

The .040" and the 18 degrees timing only applies to the AC-C86 or C87 plugs. If you switch to Autolite then you will probably have to change the plug gap and the timing.

The correct setting for the float is 3/4".

You mentioned that your carburetor was rebuilt. You might want to check the Carter numbers on the well jet, multiple jet, metering rod and other parts to make sure that they are correct.

Which Carter carburetor do you have, the 126-S, the 135-S or the 150'S?

Not sure at this time which one I have, will be taking it
off shortly, where can i locate the proper numbers to the parts you mention?

The numbers are stamped on the parts. On the metering rod you will have to measure that with calipers and compare it to the Carter specs. to see if it is the correct one.

Cater RJH - 08 is the carb, is there a Place to compare
part numbers of it?

Carter RJH-08 is the core casting number for all three of the carburetors listed above. You will need the model number which is either 126-S, 135-S or 150-S.

(The above should be 125-S, 136-S or 150-S)

Got slippery fingers Doggie? Should be 125S, 136S and 150S at least in my Carter books.

Ya....I keep transposing the numbers. I caught it on my previous post and when I made the new post I did the same damn thing!

It's a 125S short accelerator pump

Other than the float setting which I will be checking
what else would cause it to run rich.

The most often cause of running rich is corrosion in the low speed jet passage allowing gas to be drawn up from the bowl. Second is wear on the multijet and metering rod.

I think you hit the nail, it runs fine at idle, but if
turn the idle screw out just a little further I hear a hissing noise. Thanks now I have things to look at. By the way if I get stuck, is there a substitute carb

I don't know of a better replacement. Best to have your carburetor rebuilt. There are two on Chat that have a lot of experience rebuilding those carbs.

who? Are this on this chat? How do i contact them?

You have already received replies to your posts from both of them.

By the way, many 1929 Chevy owners use the Carter 150-S instead of the Carter 125-S. The 150-S is a replacement carb. for both the 125-S and the 136-S carburetors.

Need service on Carb, one of you had a 1930 bench test engine
I believe, The Carb is off.

Hi are you the one that had test engine. I need our 29 carb
serviced its not off and ready to chip


Stan

Okay, so is the carburetor on the car or off the car???

Stan,
I have a '31 Chevy test engine that I use to test rebuilt carburetors. Tested five today. Three ran well, one runs okay but floods due to leak past seat (corrosion) other has rough idle. Got to get those two repaired.

Great
Now how do I contact you ? I am in Manitoba,Canada

I sent you a PM.