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  1. #1
    ricky86's Avatar
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    burned intake valve seats

    i'm putting new valves in my 2006 rxp and when we took the intake valves out we noticed that the intake valve seats were burnt. does anybody know what can cause this.

    thanks

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  2. #2
    shrabber's Avatar
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    I would Have to say Mostly Likely Running Lean (Valves To Hot) Intake Valves are cooled Through air and Fuel through the Intake. Some of us tend to clean them up with Mentanol after I seen a Hell of alot worse..

  3. #3
    Eastside Powersports Slow 91's Avatar
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    Design flaw. and the intake guide cut down like that isnt helping matters any.

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  5. #4
    shrabber's Avatar
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    Chris do you have any popcorn left>>>

  6. #5
    ricky86's Avatar
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    [QUOTE=Slow 91;2119085]Design flaw. and the intake guide cut down like that isnt helping matters any.[/QUOTE

    Do you mean that cutting the valve gide like this caused this problem or do you mean that there is no performance gain in cutting the valve guide like this.

    Thanks

  7. #6
    Eastside Powersports Slow 91's Avatar
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    Quote Originally Posted by shrabber View Post
    chris do you have any popcorn left>>>
    no you tried to paint it all orange!!!!!

  8. #7
    Eastside Powersports Slow 91's Avatar
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    [QUOTE=ricky86;2119097]
    Quote Originally Posted by Slow 91 View Post
    Design flaw. and the intake guide cut down like that isnt helping matters any.[/QUOTE

    Do you mean that cutting the valve gide like this caused this problem or do you mean that there is no performance gain in cutting the valve guide like this.

    Thanks
    for something that is drag only, sure it will increase air flow, but something that is rec ridden or used alot i wouldnt do it. The guides on the 4 tec are short as it is, now your removing .300-450" of guide material and forming it with the head casting. At the very end of the guide its ovaled out. So, with that being said, now your valve has alot more "end play" than a round guide would.

  9. #8
    Eastside Powersports Slow 91's Avatar
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    double post.

  10. #9
    ricky86's Avatar
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    The boat is used for cc racing for about 15 hours a year and then it will be completely tore down to inspect it.

    In your opinion is it better to have the longer guides for my aplication ???

    And is the damage because of the desing flaw or is it because of running lean

  11. #10
    Eastside Powersports Slow 91's Avatar
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    Quote Originally Posted by ricky86 View Post
    The boat is used for cc racing for about 15 hours a year and then it will be completely tore down to inspect it.

    In your opinion is it better to have the longer guides for my aplication ???

    And is the damage because of the desing flaw or is it because of running lean
    The way i do mine is i machine them down as far as i can. this will leave a small amount of the guide in the bowl area but it will still be a round guide.

    The problem is that the valve job on the intake seats is set far out towards the outer edge and its very brittle, and after a while it chips away.

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