Calculate RPM for Max Power - RPM for Max Power

By popular vote a place to add formulas. If you post a formula please make sure your abbreviations are spelled out so it avoids a lot of follow-up postings.  I know a lot of abbreviations are common or taken to be common knowledge. Please be sure to checkout the new FAQ of common abbreviations.

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Postby larrycavan » Sat Nov 12, 2005 5:40 pm

For Racing Engine "X" = 2000
For Superstock Engine "X" = 2200
CID = Cubic Inches of one cylinder.

RPM = ("X"/CID) * (CFM@10" water)

NOTE:

When used in a spreadsheet in combination with the formula for Ve as published in my Superflow 110 manual, this formula seems to be based on the racing engine achieving 120% Volumetric Efficiency at the calculated RPM.
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Postby Rick360 » Sat Nov 12, 2005 5:48 pm

Larry,
Shouldn't displacement figure into that equation? How can you know what rpm that amount of flow will peak HP at without knowing how big the engine is that it is feeding?

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Postby larrycavan » Sat Nov 12, 2005 5:58 pm

Exactly right Rick....my fingers got away from me....

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