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Is there a general formula out there for determining engine vs alternator rpm or is there too much of a varience from vehicle to vehicle to make any real determination? I know its going to based off of pulley sizes and whatnot but wasn't sure if there is a ballpark answer for this sort of thing. I'm in the market for a big alt for a daily driver car so I'm trying to figure out what's going to be my best bet.
Posts: 7 | From: Orlando, FL | Registered: Dec 2008
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I don't know of any ballpark number i know of but if i remember my math from back in high school it is not that hard. it would be rpm of crank pulley/crank pulley size=x/ alt pulley size. where x is = to the rpm of the alt pulley. can any one verify this it been a while.
-------------------- 1993 Dodge Dakota LE Street Max 2 Fi BL's 2 Hifonics Brutus BXi 2008D Mechman 250 amp street beater alt Power Master D3100
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that should work. i thought the alternator was typical about 3x as fast as the motor, but i could be wrong
Posts: 5494 | From: Columbus, OH - formerly FL | Registered: Oct 2003
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Yeah that should work. How close you think it is to a 3:1 ratio? Thats way easier to ballpark lol.
Posts: 7 | From: Orlando, FL | Registered: Dec 2008
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i'm not sure. that's just something i thought I heard before....but what orion93 said should work. just very basic physics
Posts: 5494 | From: Columbus, OH - formerly FL | Registered: Oct 2003
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