04-30-2014, 11:37 AM
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CC Member/Contributor
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Join Date: Feb 2000
Location: Greenville,
SC
Cobra Make, Engine: 70 Shelby convertible, ERA-289 FIA, ERA 289 roadster hybrid, mystery Ford powered 2dr convertible
Posts: 12,763
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Not Ranked
Quote:
Originally Posted by blykins
How much vacuum are you making?
Bill, I would agree that a lot of guys typically put carbs on that are too big. In this case, I think Jim is on the fence.
Usually, when the carb is too much for the engine, it shows lean as the engine isn't efficient enough and can't suck hard enough on the carb to produce a good signal.
In this case, he's possibly running a little rich, which could be just a jet change, air bleed change, or if he has lower vacuum, it could be opening the power valve prematurely.
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Yes, he can eventually tune this carb, after spending more than a 750DP would cost, yet he will still end up with drivability issues. Where if he dumps the 850 now and drops to a 750DP, he will spend less time and money in the long run, and get better, more efficient power out of his current engine.
Bill S.
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