Not being anywhere near as well versed on these subjects as some of you, I
always fall back on the rule-of-thumb of :
cubic inches of displacement x 2 = MAXIMUM required CFM.
Not very scientific, obviously. And there are certainly a jillion variables.
But, I think it generally holds true and would keep most people from going
hog-wild in the carburetion department.
Doug Dwyer
Longview, Washington USA
From: "Sally or Dick Taylor" <tr6taylor@webtv.net>
> Dick, replying---I think Shane is right about some owners
> overcarburetting their engines. We know it looks cool to hang either
> larger or more carbs on an engine, as all but the most dedicated of us
> spend more time looking at such an engine and bench racing, than
> actually competing.
>
> Back to the "Cubic Feet per Minute" of air engines such as the TR Six
> require, I'll pass on the formula: ZZzzzz. Hang on, there will
> be something here for nearly everyone!
>
> Theoretical cfm = rpm x (cubic inches) displacement divided by 3456.
> (3456 is the constant for CF) So...
> 6,000 rpm X 152 / 3456 = 264 cfm.
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