Maximum alternator rpm?
Thread Starter
Melting Slicks
Joined: Dec 2008
Posts: 2,772
Likes: 64
From: Mystic CT
Maximum alternator rpm?
What is it I have read it as 18000 at the alternator. I have a rebuilt alternator and taking off under drive crank pulley to install a stock one(L98) that is 7 1/8 diameter and the alternator one is 2 inch. Assuming the rev limit on a L98 is 5600 That comes out to 19950 at the alternator. Has anyone run this combination and made out ok? Doing air pump eliminator at the same time and sure seems a lot simpler than what I have seen done.
Team Owner
Joined: Dec 2012
Posts: 30,427
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From: Outside the Quick Stop N.J.
I am assuming (
) that most of the late 80s early 90s GM alternators were built the same way, the one I had was off of a 1500 pickup.
Last edited by Patsgarage; Jul 12, 2018 at 11:28 PM.
Thread Starter
Melting Slicks
Joined: Dec 2008
Posts: 2,772
Likes: 64
From: Mystic CT
71/8 crank pulley and 2 inch alternator? Even if you have the 21/4 alternator one still well past anything I would do. With that combo you would still be over 25000 rpm at alternator. I get it I am worrying too much about it.
Team Owner
Joined: Sep 2003
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Race Director
Joined: Sep 2003
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From: Database Error Indiana
First time I went to 6000 RPM my plastic fan exploded. Replace alternator. Second time at 6000 it exploded. Bought a new, not rebuilt alt at the Autozone with a steel fan and fixed the problem.
Thread Starter
Melting Slicks
Joined: Dec 2008
Posts: 2,772
Likes: 64
From: Mystic CT
Thread Starter
Melting Slicks
Joined: Dec 2008
Posts: 2,772
Likes: 64
From: Mystic CT
Found the internal fan, can see it through the last radial vent holes by electrical connectors, it is metal so screw it no worries there. Gave the pulley a spin and has a slight high pitched squeak. Is this car ever going to surrender?It it makes noise we have a local rebuilder that is real good and a friend will just have him put some bearings in it if needed.