Hey guys... not sure if everyone here knows what this is... but does anyone know if there's such a thing as a decoupler pulley that's available for the 80s GM alternators?

It's something that I installed on my Crown Victoria, and really helps the reliability of both the alternator, the belt, and the accessory system.


Here's a good video to explain how it works:



Long and short... the civilian Crown Victorias didn't come with these, but the Police versions did because of the way they're typically driven. I upgraded my Crown Victoria years ago with most of the performance parts from the police and Marauder variant. The shift from 1st to 2nd, even with 2.73:1 gears at max RPM is just insane. There's so much difference in the belt speed that the pulley squeals for a second, even with all brand new parts (tensioner, and everything in good shape). It's a problem Ford fixed by installing these decoupler pulleys. Just curious if anyone knows if there's any way to retrofit one of these pulleys onto the alternator shaft for our older alternators.

Here is a really good video that shows the difference between using a solid versus an OAP at high speeds...

Aside from the obvious craziness with the belt... the big take-away is that the alternator is not really creating the lag on the motor that it would otherwise be doing at full throttle... so if I understand correctly... you're actually not getting that parasitic loss at WOT over a certain RPM.



Thanks!!!