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Old 06-04-2008, 06:10 PM
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CR using Alcohol - Help needed

I know that a supercharged motor should be a low compression motor running gas due to detonation problems and lean out. What would be the maximum CR for a SBC with a Weiand 177 supercharger running alcohol?

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Old 06-05-2008, 03:09 AM
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How much boost?
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Old 06-05-2008, 07:55 PM
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I think the 177 is good for about 8-10 lbs. using the 6" lower pulley I have.
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Old 06-06-2008, 09:11 AM
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At 10 lbs boost...
8.0:1 static c.r., 13.4:1 effective c.r.
9.0:1 static c.r., 15.1:1 effective c.r.
10.0:1 static c.r., 16.8:1 effective c.r.
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Old 06-06-2008, 12:30 PM
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12 to 1 with only 10,ya need static. Most with a 14/71 run 11.5 to 12 with 28 to 30 lbs depending on what they are doing.
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