Author Topic: Alternator question  (Read 4367 times)

Offline janjon

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Alternator question
« on: August 07, 2013, 08:36:22 PM »
Related to previous MSD question. I'm running a total-loss system, SBC with electric fuel pump and electric water pump drive and radiator fan. And Powerfire distributor / ignition. Self-contained. OEM alternator pulley sizes spin the alternator a good bit faster than crankshaft RPM, being much smaller than the crank pulley. Over-sized, "deep-groove" pulleys of the past were much larger and would spin the alternator much closer to 1-to-1 with crank speed. My question is, is that slower speed enough to provide adequate power to the battery and the electrics and electronics???
Just keep the same amount of stuff on the right
as there is on the left. Seeing straight ahead is highly overrated....

Offline Spud Miller

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Re: Alternator question
« Reply #1 on: August 08, 2013, 04:03:52 PM »

 You don't mention how many amps the alternator is, but I bet you'll be fine.

 I think the battery (assuming it's a normal size/capacity battery) is ok to absorb the fan, water pump and fuel pump for a while.  The major concern is the ignition. Since the alternator is moving at a high RPM when you need the most ignition, I think you'll be ok.

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