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  1. #1

    Join Date
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    RXT SEADOO Piston problem

    Hello,

    I have installed Turbo in my RXT-X. I can run max. up to 20 psi. I have problem, that OIL rings not to have long time. All times damage, to fracture.
    Which pistons I can see in stock or first oversize??

    thx advices.

    ps: I have Les Cook ECU 9100 rev lim. BUT never not more rpm than 8700 !!!


  2. #2

    Join Date
    Nov 2006
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    Delray Beach, Florida
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    Are you running your engine too cold? If you are running the cylinders too cold, when you boost it, and the pistons expand rapidly the pistons may be dragging the cylinder walls. You need a minimum of 150F outlet temp from my experience, 160 to 170 is better.

    I run a turbo GTI 25psi, completely stock motor except for cam and valve train, no piston issues at all. It has 28 hours of racing and race practice only no rec riding, all at full power.

    You must not run it lean, or excessively high egt, and if you detonate it, the rings will fail very fast. Also they do not like high quality oil !!! Run like a 10-40 petroleum oil and change it often. The rings will never fully break in on the good oils...

    Good luck. do you have any photos of the pistons and rings?

  3. #3

    Join Date
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    Quote Originally Posted by Louis914 View Post
    Are you running your engine too cold? If you are running the cylinders too cold, when you boost it, and the pistons expand rapidly the pistons may be dragging the cylinder walls. You need a minimum of 150F outlet temp from my experience, 160 to 170 is better.

    I run a turbo GTI 25psi, completely stock motor except for cam and valve train, no piston issues at all. It has 28 hours of racing and race practice only no rec riding, all at full power.

    You must not run it lean, or excessively high egt, and if you detonate it, the rings will fail very fast. Also they do not like high quality oil !!! Run like a 10-40 petroleum oil and change it often. The rings will never fully break in on the good oils...

    Good luck. do you have any photos of the pistons and rings?
    THANKS This is really good advice.

    I have also installed in head all with B kit cam.
    All more was stock in engine, but now was must boring engine to first oversize and I installing CP race piston 8.0 compression.
    I have in fuel system walbro 255 intank fuel pump, RUDE RFPR, and 60 lb injectors. I have Seadoo centre ECU from Les Cook. I don't know this is with or w/o knott controll. BUt I buy now RIVA ECU. When I test turbo I was best oil from MOTUL 300V CRONO for turbo engines. BUt may be I ran too cold. I have open loop system and very difficult setup to best temp. I need check water in head outside yes?? That point I need 150-170 F ?
    Are You water cooled Turbo and open loop?? I have many questions about water system If you have open loop.

    THX
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  4. #4
    2006 Turbo RXP boBO's Avatar
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    Do you ever check A/F ratio
    From the Pic. it looks you are running lean

  5. #5

    Join Date
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    I sent you another PM

  6. #6
    super leanthe af its over 16

  7. #7
    The Under Dog
    Join Date
    Apr 2008
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    Quote Originally Posted by fast1197r View Post
    super leanthe af its over 16
    i was under the impression les cooke ecu has to have a 72lb inj when running high boost application

  8. #8

    Join Date
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    these were my pistons when i was running the rotax racing ecu with no knock control, since the riva ecu i've not had any problems
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  9. #9
    ROTAX RACING performance
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    the Rotax Racing ECU was not the problem , your setup wrong, the Rotax Racing ECU is tested for 300 h in different condition, befor releasing to the market , I have build more then 100 skis and engines , 90% with Rotax Racing ECUs , I had never a problem like that

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