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  1. #1
    zimzalahbim's Avatar
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    [iston color, exhaust color

    i just read a thread in another forum, and someone was talking about brown streaks on the top of the piston, or inside the stinger being an indication of running too lean. i know that the piston in my hyper .21 is brown, but she runs with a thick stream of smoke always. i also just finished breaking in a nova rossi .12 engine, and the aforementioned brown stuff is in the end of the stinger of the pipe. i couldn't think that this engine was running too lean, because during the hear cycling phase of break in, brown, unburned oil poured out of the pipe. could the engine run too lean with all that oil pouring out? i do not have a temp guage, but monitor the engine temp, crudely, by spitting on the engine. i use 25% tornado fuel, bought in korea where they mainly only use this brand of fuel. anyhow, just wanted some confirmation that maybe the brown color symptom could be bunk. thanks

  2. #2
    slodsm's Avatar
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    RE: [iston color, exhaust color

    Yes, color is really no indication of anything, oil stains are what causes the color. If you tear down a motor run with Blue Thunder, you will find everything the fuel touched on it path through the motor has made a dark dark green to brownish stain. Now if you see tiny pits in the top of your piston, that would be an indication of detonation which is a by product of running too lean, but the color itself really is not.
    Jay Sensing, Car Moderator
    Airing it out on the east coast.

  3. #3

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    RE: [iston color, exhaust color

    Smoke is not necessarily an indication of whether you are lean or rich. More and more fuel companies are making fuels that produce less visible smoke to preclude potential environmental issues that have surfaced in other countries. Also, different brands produce different levels of smoke.

  4. #4

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    RE: [iston color, exhaust color

    :O my Savage with stock motor....the piston surface is all black, the underhead is all black...... but the temperature is around 280 which is normal...

    any clue?

  5. #5
    HondaCRX's Avatar
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    RE: [iston color, exhaust color

    either still lean, or lack of proper ventilation
    Mazda RX-7

  6. #6

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    RE: [iston color, exhaust color

    color on the piston can be an indication of bad tuning
    ORIGINAL: zimzalahbim

    i just read a thread in another forum, and someone was talking about brown streaks on the top of the piston, or inside the stinger being an indication of running too lean. i know that the piston in my hyper .21 is brown, but she runs with a thick stream of smoke always. i also just finished breaking in a nova rossi .12 engine, and the aforementioned brown stuff is in the end of the stinger of the pipe. i couldn't think that this engine was running too lean, because during the hear cycling phase of break in, brown, unburned oil poured out of the pipe. could the engine run too lean with all that oil pouring out? i do not have a temp guage, but monitor the engine temp, crudely, by spitting on the engine. i use 25% tornado fuel, bought in korea where they mainly only use this brand of fuel. anyhow, just wanted some confirmation that maybe the brown color symptom could be bunk. thanks

  7. #7

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    RE: [iston color, exhaust color

    bump


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