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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Jan 2017 Posts: 308 'Bolter | | 'Bolter Joined: Jan 2017 Posts: 308 | Am putting correct Intake/exhaust on my 235 and a Rochester 1B carb. Which rebuild kit would you want? Ethanol resistant or regular. I can get Ethanol free gas for now, but how long will it be available. Thank you for your input...Bill | | | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | I'd get ethanol resistant - you never know when/where you might need gas in a place with ethanol-containing gas. | | | | | Joined: Mar 2010 Posts: 10,281 Renaissance Man | | Renaissance Man Joined: Mar 2010 Posts: 10,281 | Who carries ethanol resistant kits?
1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission
| | | | | Joined: Nov 2002 Posts: 2,766 Carburetion specialist | | Carburetion specialist Joined: Nov 2002 Posts: 2,766 | Carl - all of ours are ethanol-resistant; some are ethanol-proof (leather accelerator pumps).
Jon.
Good carburetion is fuelish hot airThe most expensive carburetor is the wrong one you attempt to modify. If you truly believe "one size fits all," try walking a mile in your spouse's shoes!The Carburetor Shop | | | | | Joined: Dec 2005 Posts: 50 Wrench Fetcher | | Wrench Fetcher Joined: Dec 2005 Posts: 50 | Jon: Do you have a website for your stuff?
1951 Chevy 3100 5-window
261 cu in, 348 Head, Split Fenton Exhaust
Offy with Dual Weber 2 Bbl Carbs
| | | | | Joined: Mar 2010 Posts: 10,281 Renaissance Man | | Renaissance Man Joined: Mar 2010 Posts: 10,281 | Hey Jon, how about ethanol-proof for Carter YF2100 accelerator pump diaphragm?
1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission
| | | | | Joined: Nov 2002 Posts: 2,766 Carburetion specialist | | Carburetion specialist Joined: Nov 2002 Posts: 2,766 | Carl, believe me, I have tried!!!!!
Unfortunately, neopreme is an "approved" material for use with ethanol (by our government). Thus the companies that produce the diaphragms have no interest in going with a better material.
Buna N rubber with embedded fiberglass threads is a better material. Unfortunately, to date, I have found no USA supplier that makes the Buna N in a standard thickness for use in the diaphragms. The Buna N manufacturers WILL do a special run, but the cost is just plain astronomical. Perhaps it could be made offshore, but I think most on this forum know my feelings about offshore parts. As long as I own my company, there will be NO offshore parts in my kits.
And even if a special run of the Buna N were made, do not know the exact required thickness. The diaphragm is molded with a steam die, and it would take someone more conversant than me with shrinkage/stretch factors to get it right the first time.
51Bowtie - this forum, like most forums allows each user to display a profile. Clicking on the username for any user will allow access to that information that particular user has provided.
Jon.
Good carburetion is fuelish hot airThe most expensive carburetor is the wrong one you attempt to modify. If you truly believe "one size fits all," try walking a mile in your spouse's shoes!The Carburetor Shop | | | | | Joined: Mar 2010 Posts: 10,281 Renaissance Man | | Renaissance Man Joined: Mar 2010 Posts: 10,281 | Thanks Jon! I get about 2 years on a diaphragm before it gets stiff and develops a pinhole in it and starts running a little rough, followed by running too rich to idle soon after. I am able to get home by pulling out the throttle cable to boost the RPM high enough to burn the excess fuel. (You gotta love these "antiquated" designs). I keep an extra ready-to-go YF2100 on the shelf just for such emergencies to keep my down time at a minimum.
I am willing to put up with this deal so that I can enjoy the better fuel mileage and performance compared to Model Bs I have run in the past.
Carl
1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission
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