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  1. #1
    Team RTYD burton9010's Avatar
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    motor compression

    I found this motor on ebay and was a little shocked when I had seen 180 psi compression. I thought the msx 150 had around 140 psi. I thought 180 psi with a turbo would be a little much.
    http://cgi.ebay.com/ebaymotors/2004-...rcraftQ5fParts


  2. #2

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    Call Randy at Watcon.com

  3. #3
    desperado's Avatar
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    180psi is inaccurate for turbocharged Weber engine. The compression ratio for all turbocharged Weber engines is 9.0:1 and the normal compression reading is 140psi +-5psi.

    The naturally aspirated Weber engine have a compression ratio of 11.0:1 and their normal compression reading is 165psi +-5psi. These have never been used in any Polaris PWC's.

  4. #4
    urugol's Avatar
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    Quote Originally Posted by desperado View Post
    180psi is inaccurate for turbocharged Weber engine. The compression ratio for all turbocharged Weber engines is 9.0:1 and the normal compression reading is 140psi +-5psi.

    The naturally aspirated Weber engine have a compression ratio of 11.0:1 and their normal compression reading is 165psi +-5psi. These have never been used in any Polaris PWC's.
    I think there may be cause for concern with these high comp numbers. On the 2 strokes when dieseling occurs the massive carbon build up can increase compression. Not sure if this happens as much on the 4 strokes but it would be running quite rich to get such a build up. I wouldn't touch this motor unless I could see it with the head removed.

  5. #5
    Team RTYD burton9010's Avatar
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    Quote Originally Posted by desperado View Post
    180psi is inaccurate for turbocharged Weber engine. The compression ratio for all turbocharged Weber engines is 9.0:1 and the normal compression reading is 140psi +-5psi.

    The naturally aspirated Weber engine have a compression ratio of 11.0:1 and their normal compression reading is 165psi +-5psi. These have never been used in any Polaris PWC's.
    Thats what I was thinking that this is way to high for a turbo charged motor.

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