03-17-2012, 03:06 PM
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Half-Ass Member
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
Posts: 22,025
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Not Ranked
Quote:
Originally Posted by Pman1961
Jerry would you recommend a higher amperage alternator as well?
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Your alternator only needs to put out 20 amps at idle to handle this job. Here, I keep benchmarks on what my car is doing when it is running perfectly so I can go back and compare when something is amiss. When my battery is fully, 100%, charged I get a reading of about 12.7 volts. When I turn on all my fans (1800CFM puller and dual pushers) the draw is just under 23 amps and the voltage drops to 11.9 volts. I doubt your single big fan pulls as much as my three fans running all together. When I shut the fans off the voltage goes back to 12.7 volts in just a few seconds. And by the way, each pusher fan draws 3.7 amps at this voltage. Now I know you don't have an inductive DC ammeter, but if you could repeat this test and give us your voltage numbers it would make for a good comparison. All of this is done with the car not running, of course.
Last edited by patrickt; 10-25-2016 at 09:34 AM..
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