2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

S4\5 dual alt pully on FD alt

Old Sep 20, 2007 | 10:32 PM
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S4\5 dual alt pully on FD alt

ive read a lot about putting on an FD alt, which im going to do soon, but i have a dual pulley that i can take off my existing alt and want a GOOD answer whether or not it will work...
i will of coarse take this to a machine shop to be drilled to fit the FD's larger shaft, but ive read in a few spots that the FC dual alt pully will UNDERDRIVE the alt at idle. is this true? and what can i do to fix this issue? i know there is always the option of buying one for the FD alt, but i would like to use what ive got..
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Old Sep 21, 2007 | 06:16 AM
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Comparing the two stock pulleys (FC and FD) they are basically the same, so swapping the stock units doesn't result in the FD alt being underdriven.

Is your dual pulley a stock or "race" (i.e., underdriven) part?
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Old Sep 21, 2007 | 03:04 PM
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im pretty sure its the stock pulley...

and is that the mystery science theatre 2000 bird guy???
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Old Sep 21, 2007 | 04:34 PM
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Yup, Tom Servo.
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