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  1. #1
    Nonstop, all day, everyday. 01xdime's Avatar
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    Piston ring compressors

    What piston ring compressors are people using? I'd like to use ARPs tapered bore specific compressor but they dont have anything metric thats the right size. Would a 4" or 3.9" one work? I believe the 4 tecs bore is something like 3.93 inches.


  2. #2
    I got one from Summit Racing. Worked fine and not too expensive. Here is a link to the exact one I ordered.

    Mark

    http://www.summitracing.com/parts/SME-90A3900/

  3. #3
    I use a corrugated edge one, it doesn't slip down the bore like my old thin one did
    new

    old

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  5. #5
    Nonstop, all day, everyday. 01xdime's Avatar
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    Quote Originally Posted by rotax racing View Post
    this is what i use. price is right too

    http://www.wiseco.com/PDFs/Wiseco-CompressorSleeves.pdf

    What size do you use Mark? I see 99.00 and 99.50

  6. #6
    The spec on new pistons is 3.9350-3.9360 diameter.

  7. #7
    Nonstop, all day, everyday. 01xdime's Avatar
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    Quote Originally Posted by Mark S View Post
    The spec on new pistons is 3.9350-3.9360 diameter.
    Call me stupid but what size do you use?

  8. #8
    I use the one in the link above, which is adjustable from 3.9-4.05...I won't call you stupid either.

  9. #9
    Quote Originally Posted by 01xdime View Post
    What size do you use Mark? I see 99.00 and 99.50
    i use the 100 mm one. std piston size is 99.94mm. i also modified (bored) another one for oversize pistons

  10. #10
    Nonstop, all day, everyday. 01xdime's Avatar
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    Thanks Mark. How's business brother?

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