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63 vs. 64 supercharger pulleys

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  • #16
    IMJ, keep in mind that the limiting factor with Paxton blowers is the output or impeller rpm. The max impeller rpm is 38,600 (the often quoted number). Impeller rpm is determined by pulley step-up ratio X 4.4 X engine rpm. The only variables you can control are the engine rpm and to a limited extent, the pulley step-up ratio. If you are operating the engine under 5000 rpm, then you shouldn't have much concern, but if you are looking to turn 6000, then you need to run the calculations and adjust the pulley ratio. I'm not sure this clarification is necessary, but I thought it worth mentioning.

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    • #17
      The reason for the change in pulley diameters between '63 and '64 (actually it occured before the end of'63 model year production) was to take clear of an interference problem between the steering bellcrank and the crank pulley. The upper pulley diameter was changed to keep the drive ratio the same.
      The only High Output pulleys available were for the Avanti style blower setup. It only would be applicable to the Larks and Hawks (and of course, the Avanti) for the '64 model IF said car was ordered with the R3 Package. This is because the R3 installation used the Avanti water pump, pump manifold and blower setup rather than the standard Lark/Hawk setup.

      R2Andy
      R2Andrea

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      • #18
        The only parts book which has the R3 and R4 parts info in it is the Avanti Parts Manual with the black and gold cover, dated December 1963. The R3 and R4 updates to the Lark/Hawk book never happened before South Bend was shut down. Given that there was only 1 R3 Lark and 1 R4 Lark built before the end of South Bend production it was rather pointless to make such an update to the book.

        R2Andy
        R2Andrea

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