Rochester BC occasionally pops

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Bruce Bernhjelm

(@bruce-bernhjelm)

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Topic starter June 7, 2024 4:47 pm

54 BelAir with 235 Rochester BC carb that pops occasionally when I’m starting to accelerate from a stop. I’m at 2 turns out on the idle mix screw. I’ve adjusted the idle rpm to 500. I’ve checked vacuum and I’m in the green. I’ve switched carbs because the other one was warped. I’ve read about using lower octane gas and I’m trying that now.
Any suggestions?

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Carb issues

Stovblt

(@ole-olson)

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June 7, 2024 9:40 pm

Hi Bruce

Just to clarify...

You say you switched carburetors.

The popping occurs with both carburetors?

Ole S Olson
Saskatoon, Sask, Canada
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Bruce Bernhjelm

(@bruce-bernhjelm)

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Topic starter June 7, 2024 10:42 pm

@ole-olson yes

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Tiny

(@tiny)

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June 8, 2024 6:50 am

I don't think the fuel octane has anything to do with it. Your 54 should run fine on any regular grade gasoline.

Define "popping". Does that mean backfiring through the carburetor? Does that mean a stumble/misfire on acceleration? Does that mean a backfire out the exhaust? More detail about what's happening will help us help you.

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Bruce Bernhjelm

(@bruce-bernhjelm)

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Topic starter June 13, 2024 9:26 am

@tiny thanks Tiny, sorry it’s taking so long to get back to you. I had a battery go bad, replaced and back again. The car will pop through the carburetor when I try to accelerate too fast. If I ease down it seems to be okay.

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