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  1. #1
    GODOSIDIS's Avatar
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    Ultra 250 9.5-1 Compression Ratio Piston Kit

    The R&D High Compression Piston Kit is designed to boost overall compression for increased horsepower throughout the entire RPM range. Designed for closed course racing and race gas.Pt. # 431-25095

    Seems like we are moving up.
    I was told that it only works with the Ultra 250X Supercharger Stage 1 Engine Kit
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  2. #2
    Beagleman62's Avatar
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    I wonder if they are using the stock rings

  3. #3
    GODOSIDIS's Avatar
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    I am sure they dont.
    Race gas is a big minus.

  4. #4
    8.5-1 to 9.0-1 might work without race gas, if some 1 were to make them.

    Raising the compression ratio should provide significant gaines, especially with more boost.

  5. #5
    Fat Man, Little Boat Region8Ultra250X's Avatar
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    more boost and higher compression more than likely will require race gas 9.0-9.5:1 compression on a forced induction motor is dancing with race gas territory.... you tune in the ecu would gave to be spot on for it to work and no detonate

  6. #6
    blownhotrodder's Avatar
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    Thats about the same thing as adding more boost.

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