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  1. #1

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    high compression pistons

    Hey guys,
    had a number 2 piston failure so im looking at a rebuild.
    i have a rude series 1 charger. instead of trying to increase boost, why not just bump the compression up a tad?


  2. #2
    You could stick with the stock pistons, which are good, shave the head .030 for higher compression. Might as well have the head ported while it is off, throw in some stock lightened valves and finish it off with a Rotax racing cam. That should work well with the Rude1 charger and will be reliable.

    Mark

  3. #3

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    i was thinking cp pistons, i run them in my car

  4. #4

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    Before thinking about pistons.....keep the stock piston look on the top of the pistons. I believe the cp.s will not do what you want.

  5. #5

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    oh i havent done much research on them i just assumed they had different compression ratios.

  6. #6

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    Riva has higher compression pistons for the 4tec.

  7. #7
    GOT BOOST? Dockside's Avatar
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    Quote Originally Posted by Louis914 View Post
    Riva has higher compression pistons for the 4tec.
    pluse there just plain NICE

  8. #8
    rick xp's Avatar
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    Is there much gains in going high comp pistons?

    I want some more gains without some more boost.

  9. #9

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    gotta be careful, its not just oh lets throw in high comp pistons and run 87 fuel...i don't remember what stock compression is but say its 9:1 for example and you upgrade to a 15psi charger, your packing more air in the cylinder, same can be accomplished by increasing the compression ratio and keeping the boost the same.... kinda like diesels running there 14:1 and 30 psi, granded we cant run 42 octane, but u get the picture...

  10. #10
    R88ory RXP's Avatar
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    Quote Originally Posted by rick xp View Post
    Is there much gains in going high comp pistons?

    I want some more gains without some more boost.
    Yeh you will make more power and have faster throttle response but you have to make sure your fueling/timing is good and be running good fuel at all times. R88

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