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  1. #1
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    Default Under Drive Pulleys

    Does anyone know where I can find a under drive Holden V8 v-belt crank pulley......

  2. #2
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    If it underdrives the water pump & the car is street driven, be prepared for overheating...

  3. #3
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    ...but what rpm is too much for pulley water pump?,I'm at 6500 but want to keep clutch fan and shroud.

  4. #4
    Do you ever leave? EH179's Avatar
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    I run a clutch fan and shroud to 7000 without issues.

  5. #5
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    Quote Originally Posted by 71rocket View Post
    ...but what rpm is too much for pulley water pump?,I'm at 6500 but want to keep clutch fan and shroud.
    SKF used to publish everything you never wanted to know about bearings, I feel like 18k is about the upper limit for a typical sealed roller bearing but 18k for 2 seconds is different to 12k for 20 minutes so its not a definite measure of pass/fail.

    I dont really remember underdriving being a thing for regular people until the LS came about and the "fastest stock but modified but still mostly stock unless someone checks" LS records were being chased by all and sundry.

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