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Old 03-19-2008, 08:55 PM   #2 (permalink)
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Originally Posted by Frank Lee View Post
I don't recall where, but someone once provided a link to an engineering text that mentioned 1000-1200 ft/mn as optimal piston speed for economy.

My question is, is that true and why is it?

Why wouldn't, say, 700-840 ft/mn be even better?
I recall the same. At the time, I did the calcs for my engine and came up with the same RPM at which my best, constant FE is supposed to occur, which it, indeed, does:

1714 RPM @ 42.5 MPH (4th gear, Full TC lockup)

Here is a link to an article on it.

The text may hold some advice on the slower speed question.

“If we knew what we were doing, it wouldn't be called research” ― Albert Einstein

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