04-01-2007, 10:21 AM
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CC Member
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Join Date: Apr 1999
Location: cleveland,
OH
Cobra Make, Engine: CSX4000, 427
Posts: 1,999
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Not Ranked
Quote:
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Originally Posted by quickjack
The Engine Masters builds are always running more compression than a useable engine would with pump gas, and the longer stroke gives a more favorable dwell time at TDC to help prevent detonation.
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A longer stroke will decrease dwell time, which will hurt power, and if you are able to run higher octane/ i.e. more compression than a short stroke, high dwell, then maybe it would be a wash.
A while ago, HotRod did a comparison of two BBC's, same displacement, but different bore/stroke comnbinations, and using the same heads, intake, headers, cam, etc., even I think keeping the stroke/rod ratio similar, and they didn't find a measurable difference in torque/hp. However, a bigger bore will allow bigger valves, but that wasn't the point of their test. Keep everything else the same.
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"After jumping into an early lead, Miles pitted for no reason. He let the entire field go by before re-entering the race. The crowd was jumping up and down as he stunned the Chevrolet drivers by easily passing the entire field to finish second behind MacDonald's other team Cobra. The Corvette people were completely demoralized."
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