Engine Painting

Discussion in 'Motorbike Technical Discussion' started by Ben Halicki, Dec 21, 2004.

  1. Ben Halicki

    Ben Halicki Guest

    Hi all,

    Anyone here got any experience painting engines? I want to clean up
    my XR 250's engine before it goes back into the frame and was planning
    on giving it a quick coat with VHT engine enamel, which is supposedly
    rated at 1200oC. The engine is assembled, so I probably won't be able
    to bake the paint as such. Would a few hours with a hot air gun be
    enough to bake the paint?

    Thanks in advance for any help.

    Best regards,

    Ben Halicki, Dec 21, 2004
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  2. Ben Halicki

    Ray Curry Guest

    The VHT paint doesn't burn but it does change color and doesn't look
    particularly nice after age. That aside, there's a bigger issue with
    most coatings on engine. Water. Take a hot motor and splash water on it
    and watch the finish disolve. I have spent a lot of time preping and
    coating and paint XKE headers to see them down to metal in a few minutes
    of rain. VHT works okay on the motors, not exhaust pipes but I don't
    think you'll like the results after even a short time of running.
    Anodizing in theory should be hardy but impossible to do on a engine
    with all those dissimilar metals and precision holes. Powder coating,
    unknown on effects on heat transfer. I've had my most satisfactory
    results from just walnut shell blasting and leaving the result.
    Ray Curry, Dec 22, 2004
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  3. Ben Halicki

    Ben Halicki Guest

    Thanks for those tips Ray, that's exactly the kind of information I was

    I don't suppose you've tried the VHT silver before, have you? I have
    heard that the black fades quite quickly, but wasn't sure if the silver
    would look as bad as the black does, after a few runs.

    I would have liked to have blasted the engine while the topend was off,
    but the mechanic was too quick to put it all back together, so I missed
    out on the chance. I've tried cleaning it up with a wire brush, but can't
    get in between the fins properly and it just looks tacky.

    I remember a friend of mine coating his headers with VHT black once, took
    him a good few rides before they stopped smoking!

    Thanks again for your comments,

    Ben Halicki, Dec 23, 2004
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