Thread: factory fan cfm
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Old 10-21-2019, 01:58 PM   #4
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Default Re: factory fan cfm

Originally Posted by drolston View Post
The fan turns at crank speed which is substantially lower than belt driven fans, because belt driven fans get "geared up" by having a smaller pulley than the crank pulley that drives them.

OOOPS....there goes that theory! This flathead fan, 3-BLADES no less, is belt-driven, ain't "geared-up" in the least, and looking closely at the crank and fan pullies, it almost appears that the fan pully is ever so slightly larger in diameter which would effectively slow it down to even LESS than crank speed. DD


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