4.500 stroke vs 4.150

Discussion in 'PSI Superchargers Tech Questions' started by sean70ss, Sep 14, 2020.

  1. sean70ss

    sean70ss Member

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    Do a lot of guys still use the 4.500 stroke? What are the pro/cons vs the 4.150 in the 1/8 mile pm type racing.
     
    #1
    sean70ss, Sep 14, 2020
  2. Will Hanna

    Will Hanna We put the 'inside' in Top Alcohol
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    I don't know too many people still running 4.500 stroke. On the big 65mm stuff you already have to clearance the rods for the cam with a 4.150. 4.500 on a short deck would have more angularity issues and may side load the skirt too much.

    At the rpm's we turn now, a 4.500 would be really hard on the big end of the rod. The clamping pressure needed goes up exponentially with stroke. I know GRP offers a rod bolt material that is used by the mountain motor guys but it's a $300 upgrade.
     
    #2
    Will Hanna, Sep 14, 2020
  3. sammy christian

    sammy christian Member

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    What about for a conservative TS/Q8 combo with less than "TAF/TAD rpm"? maybe a sub-9000 deal,
     
    #3
    sammy christian, Sep 22, 2020
  4. Ron C

    Ron C Jr. Dragster

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    You really need a 10.2 deck block for the 4.50 stroke.
     
    #4
    Ron C, Sep 22, 2020

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