carb jets

I recently made a set of main fuel jets for my Weber 40's. They work great. No backfiring, no sputtering, full power and rpms. If anybody is interested in the procedure or even to request a set or two, I will do so without cost. But, I don't want to get into the business.

Rich:

I think we all would be interested in what you did.

Can you post the procedure for use to read??

Thanks!

Gordon
One of the "Speedstah Guys" from South Carolina

Weber idle and main jets are available in any size you might need, and air correction jets are used to fine-tune the high rpm mixture. Why bother trying to "make" any?

George

A couple of reasons.
After installing the recommende size, the car ran terribly. Backfiring, through the carbs and through the exhaust. I researched various reccommendations on this site and in the Weber carb manual. I supposedly had installed the correct combination. My gas mileage was about 6 mpg.
After checking with various dealers, they advised letting the shop do it, or buying a number of different sizes and doing it myself. Either way was inconvenient and costly.
I have a small lathe and milling machine. I looked at the jets and decided to make my own. I started with the smallest size I thought might work. They were to small so I simply redrilled the jet slightly larger. The next size worked perfectly. Total time involved was about three hours and I had the pride of doing it myself.

Once a machinist, always a machinist.

Oh, what I wouldn't give for a decent lathe and a Bridgeport in my garage!!

Sure would save me a lot of trips to the hardware store!!

gn

P.S.: I ended up with 160's for mains in my Dells, and they were just a tad too small, too, so I used a welding tip drill on them to bring them out to 161.5's - Perfect!!

Gordon

I posted the procedure in the Knowledge category.

Gordon

You might want to check with Grizzly tools. I bought a combo lathe/milling machine for $750.00. It is small but amazingly accurate

Richard, did you check float levels, float needles and seats, fuel pressure, accel. pump nozzle sizes, idle jet sizes, and venturi sizes first?

Richard,
Did I read 'free'?
First, thanks for the kind offer. What a nice gesture to the group.
Second, I would love to take you up on the offer. Please email me what the shipping would be so I could get that to you with my address.
Happy New Year!
Terry

George brings up a damn good point, and often overlooked:

Make sure all those parts he mentioned are correct FIRST, before you start changing jets or you may end up running around in circles as they tend to reinforce each other.

gn

And...
Use a air/fuel ratio guage to establish how rich or lean the motor is running. Then again to monitor changes.
I kept going richer on my set up before I got a guage, only to find out that it was way too rich already. I'm running smaller main jets from where it started and it's still a little rich. Runs good and gets 28+ MPG on road trips. (2110 dual dells)

Greg B

George
Thanks for the thoughts. The Webers are brand new and stock. The heads are from G. Berg being fully ported and polished. I personally ported and polished the Big Max intake mainfolds so they exactly matched the openings in the heads. The muffler system is the full package from Tiger at AI. The car still ran lousy without any noticable change. I did visually check all of the jets and float levels and found no anomalties. Please remember that the car only has 2500 KM on it during which miles, I did just about everything to get it to run smoothly. I must have tried different tune ups some ten times, without any apparent changes in the the poor running, backfiring, rough idling. and very poor mileage. With the jet change, all of thses problems have disappeared. Being a hands on type, I intend to attempt to continually refine its running with the various gauges; but, my first priority was to get an acceptable level of running without being embarassed by onlookers.

Terry
I will be glad to make a set of jets for you-free. Please send me one of your present jets to obtain the exact dimensions and I need to know what size opening you want. My work address is 100 SE 12th Street, Ft. lauderdale, FL 33316
Richard Saccocio