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  1. #1

    Acceptable engine compression for 215 hp and/or 255 hp rotax 4tec engines?

    Hi, going through a check list and one being engine compression?
    What is the acceptable engine compression level for the 215 hp or 255 hp rotax 4tec engines. Also is there a minimum acceptable compression limited for its service life?

  2. #2
    Moderator Snoman's Avatar
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    125 to 135 psi....

    10% difference between any cylinder is time to consider rebuilding/fixing....

  3. #3
    So I would guess that 122 on 1, 110 on 2 and 120 on 3 would be considered in need of a rebuild? Thanks

  4. #4
    Moderator Snoman's Avatar
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    do a leak down test first to see were your loosing compression from...you could have valves that are not sealing right that could cause your compression to drop also...Once you do a leak down test you will know for sure if the rings are going or if the head needs work..this will save you a ton of time and money rebuilding something that may not need to be rebuilt

  5. #5
    Is there a minimum? For example if the readings were 100-100-100.. Or is the minimum acceptable 125psi? Thanks

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    Moderator Snoman's Avatar
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    me personally dont like seeing it below 120..but thats just me...

  7. #7
    ou812's Avatar
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    My 07 RXT with a 2 rude setup running 76-78 mph was running 115 to 120 psi for a few years. Racing endurance and hard rec riding, never an issue.

  8. #8
    cylinder 1 = 115psi
    2= 125
    3= 125

    need to be worried?
    I checked with the engine cold though...

  9. #9
    tiderider's Avatar
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    Quote Originally Posted by espritv8 View Post
    cylinder 1 = 115psi
    2= 125
    3= 125

    need to be worried?
    I checked with the engine cold though...
    Your still okay.
    115 x 10%=126.5

    126.5 is greater then the other 125 so your still good.


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