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  1. #1

    how much power can the stock internals handle?

    im just curious on how much power or boost do stock pistons and rods take before changing to something stronger like wiseco or cp. i have noticed a lot of people put the et127 wheel with 42lb injectors or even the et137+4 wheel with 48lb injectors when do stock internals start to fail? im new to the rotex world.


  2. #2
    AtoMIC_OraNGE greenbullet's Avatar
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    All comes down to your tune. I'll be running 85 mph this year on a ported built head but bone stock bottom end

  3. #3
    imp0ster's Avatar
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    <--16 psi, ID1000s, cam 9160RPMs stock internals. Stock valves too

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  5. #4
    dpracing's Avatar
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    Stock bottom end here too....

  6. #5
    boost junkie skidoochris's Avatar
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    the tiny seadoo type superchargers are no match for a stock motor
    but the wrong tune will destroy even the best built motor
    with enough rpm and boost you will float a valve until it hits a piston...

  7. #6
    Boost addict hotbird's Avatar
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    Ran stock bottom end with turbo at 16psi and 9000 rpm.
    I want to crank up the boost to 18-20 so I ordered a set of cp pistons. I was told by a few engine builders stock rods should be good till 25psi or so.

  8. #7
    These little tiny motors are tuff as hell, that's great to know. Thanks guys
    So basically I just have to keep checking on the supercharger bearings and the washers to keep these motors alive .
    are the bottom ends on the older RXP's just a strong, same bottom end as the newer ones?

  9. #8
    SLASHER's Avatar
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    Same bottom end ....

  10. #9
    Quote Originally Posted by hotbird View Post
    Ran stock bottom end with turbo at 16psi and 9000 rpm.
    I want to crank up the boost to 18-20 so I ordered a set of cp pistons. I was told by a few engine builders stock rods should be good till 25psi or so.
    i got over 30+ hours running pump gas and 15 psi turbo no issues but i am with hotbird that boost nob has powder coke on it. am eager to turn it up to 18-20psi with meth 50/50 that should equal to race gas 110/116 octane or more engine knock should be down to nothing,

  11. #10
    Quote Originally Posted by imp0ster View Post
    <--16 psi, ID1000s, cam 9160RPMs stock internals. Stock valves too
    what impeller 3 or 4 blade are you running also what pitch?

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