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  1. #1

    Chamfering SL 700

    I have a 96 SL 700 and someone mentioned chamfering the ports. The stock jugg that is not getting bored does not have any chamfering. Is this just something we do to help, or should it be there from the factor?

  2. #2

  3. #3
    Click avatar for tech links/info K447's Avatar
    Join Date
    Jul 2007
    near Toronto, Canada
    You sure the stock cylinder doesn't have chamferring of the port edges?

    It is there to prevent the cylinder rings from catching on the port edges.

  4. #4
    I know, but I cannot see any at all. Is it very slight?

  5. #5
    PolarisNut's Avatar
    Join Date
    Dec 2006
    Lower Michigan
    Feel the port edges. If there truly isn't any chamfering, it will feel very sharp. It is most important on the exhaust port, since the piston speeds are highest here, and it is the widest port. Its just a small "relief", that prevents the rings from snagging, as they slide into and out of the port as they pass by. If you chamfer it too much, it will change port timing, and make the engine run incorrectly.

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