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08-12-2019, 11:34 AM | #1 |
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Alternator question
For a stocker (LS Camaro) running BS3 elec fan,water pump,fuel pump, lights at night. Typical race car...what would be the smallest amp alternator I should run?...thks
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08-12-2019, 11:47 AM | #2 |
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Re: Alternator question
Be careful here. A alternator needs to spin about 2500 rpm or more before it starts to break even and produce + current.
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08-13-2019, 04:00 PM | #4 |
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Re: Alternator question
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08-13-2019, 05:33 PM | #5 |
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Join Date: Sep 2016
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Re: Alternator question
Just checked with an old guy who was a rebuilder and had a test bench. From memory he says about 1800 alt. rpm before they began to produce + current. So on a normal pkg. the ratio of crank to alt. pulley is approx. 3 to 1, which means at idle your not producing current back into the battery. Now with a smaller race crank and larger race alt. pulley to avoid spinning the alt. to the moon it's probably 1100 or 1200 rpm. Also they eat up at least 3 hp, maybe more.
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