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Old 03-21-2017, 01:27 AM   #3069 (permalink)
freebeard
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I looked at it the other way (I was going to let this go, but...)

A 30Krpm alternator on an engine good for maybe 6Krpm would be 5:1 ratio. If the alternator pulley were 3" the crank pulley would be 15". That's THIS BIG.
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