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M20 Underdrive pulleys

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    M20 Underdrive pulleys

    I've searched around and all I can find are the IE alternator pulley and old threads where people are threatening to machine their own.

    Doesn't anyone know a source other than IE for underdrive M20 pulleys?

    Before you bitch about how they don't do anything, this is for a track car that only sees high RPM. I want them to easy the load on the alternator and to help prevent waterpump cavitation.

    #2
    I raced a Spec E30 for eight years and had a data logger dash. I don't think cavitation in the WP is something to worry about. At least I never saw anything in the data that indicated a cooling problem at high RPM.
    The car makes it possible, but the driver makes it happen.
    Jim Levie, Huntsville, AL

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      #3
      I've modified/machined my harmonic balancer (m20b27) and replaced altenator with one from a BMW motorcycle (lighter, less draw). Haven't run it yet as the motor is being refreshed. It was a lot of work but hopefully it'll be worth it.

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