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  1. #1
    Chine Walker
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    Does polishing the piston tops & combustion chamber help ignition?

    Again something I read on an engine rebuild post.
    Any thoughts?
    Thanks,
    jp


  2. #2
    All hail the Chief! fullboogie's Avatar
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    With the amount of oil that passes through the combustion chamber and cooks onto the surfaces, I'm not sure polishing all that would help - other than to eliminate potential hot spots that may lead to detonation.

  3. #3
    "Hustler" Inkaddict's Avatar
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    Dont quote me on this because im not sure if its accurate... You can clean the piston tops with a nylon brush. I was told if you use a wire brush it WILL cause hot spots due to the scratches it will leave in the pistons. The guy who told me that builds 9 second 1/4 mile 4 cylinders. I dont know if it would apply to 2 strokes though...

  4. #4
    Moderator OsideBill's Avatar
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    Have them coated with a thermal barrier like a ceramic coating. Heat is the enemy here. http://www.swaintech.com/store.asp?p...39&catid=19694

  5. #5
    Hydrotoys's Avatar
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    Your stock GP12R and gp13r pistons are coated from the factory, with a ceramic coating on top of them. Do NOT be scrubbing these piston tops. I've had different experiences with ProX. Some were. Some we not.

  6. #6
    Chine Walker
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    Mark:
    I shall heed (sp) your warning.
    Any ideas as how to safely clean the carbon deposits of the tops?
    Regards,
    jp

  7. #7
    Hydrotoys's Avatar
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    Try kerosene. Why are you removing it?

  8. #8
    Moderated
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    Quote Originally Posted by Hydrotoys View Post
    Try kerosene. Why are you removing it?
    hydro i am about to add a 1300 top end to my 1200 and the pistons i was supplied with have a bit of build up on them as well, are you saying they should not be cleaned of carbon before installation?

  9. #9
    philip_gpr's Avatar
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    I'd say it is a good idea to clean them up then you will be able to see your pistonwash sooner

  10. #10
    Hydrotoys's Avatar
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    Quote Originally Posted by philip_gpr View Post
    I'd say it is a good idea to clean them up then you will be able to see your pistonwash sooner
    Agreed. I didn't realize you were transplanting pistons. They don't need to be spotless. Just get the thick stuff off so that you can see the tops.

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