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05-02-2005 05:28 PM #8
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- Car Year, Make, Model: '32 Henway
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Posted by SnakeHerder:
"the math tells me it's overcarbureted."
Yep, I agree, for instance:
A 355 Chevy winding 6,500 will show needing 668 cfm @ 100% volumetric efficiency, but if you have a decent cam in it and don't bolt a 750 carb on it, you're messin' up.
The only explanation I can come up with is that with good heads and a good cam, you're pulling an efficiency above 100%. The 750 carb example above works out to 112%.
If you think about it, it makes sense that efficiency is higher than you might think. With a long cam, the intake stays open longer, way past bottom dead center, so that you have more time to pack the cylinder. The gas slug has inertia and so probably packs the cylinder in excess of 100%.
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Last edited by techinspector1; 05-02-2005 at 09:59 PM.
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