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Help a Brother Out

"I'm trying to ____" and I can't ____"
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Marcal

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  • Location: Everett, WA

Help a Brother Out

PostFri May 25, 2012 9:25 am

Literally, this time.

My brother put a Summit 600cfm with vacuum secondaries on his 77 El Camino 350 small block. He is having some trouble getting the carb dialed in just right, so I offered to help by polling the Hooniverse faithful.

His big problem right now is at idle speed: the engine stumbles and tries to stall. He said "anytime I'm driving and accelerate from a stop or near stop." Any ideas?
"A one that is not cold is scarcely a one at all."
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P161911

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Re: Help a Brother Out

PostFri May 25, 2012 10:33 am

I'm FAR from an expert, but maybe something with the vacuum advance on the timing?
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skitter

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Re: Help a Brother Out

PostFri May 25, 2012 4:33 pm

Is it possibly running too rich and fouling plugs until it starts flowing more air?
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Froggmann

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Re: Help a Brother Out

PostTue May 29, 2012 4:21 pm

Is this when the engine is warm or cold?

Are you using this carb on an engine that had a 2 barrel intake? If so the engine may not have cam that can support that much CFM.
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Marcal

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Re: Help a Brother Out

PostFri Jun 01, 2012 9:57 am

He put a single-plane high-performance 4-barrel intake on it.
"A one that is not cold is scarcely a one at all."
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Froggmann

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Re: Help a Brother Out

PostMon Jun 04, 2012 1:20 pm

Ok I can only guess that either:

A: The engine isn't cammed right to handle the extra air.

B: Your brother has a vacuum leak.
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Marcal

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Re: Help a Brother Out

PostTue Jun 05, 2012 12:49 pm

Thanks for the help, everyone.
"A one that is not cold is scarcely a one at all."

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