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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.

Please post formulas in separate topics, do not add formulas to someone else's post unless it relates to the original post. Also in the topic line make a note of what your posted formula is about . Thanks
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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?

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

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

Larry
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