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Thread: 308 health

  1. #1
    casual poster
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    Default 308 health

    Hi everyone just wondering if you can watch the attached video. I use to vent my motor to atmosphere but have now plumbed to pcv. Wondering if anyone thinks its missing at all and can check the smoke it seems its intermittent or perhaps one offending cylinder. I do notice with my ir heat gun cylinder number one header temp is way down below 100 degrees always this cylinder always has the highest psi compression and when i pull the spark plug the threads are oil soaked. Idle is about 900rpm when warm this was filmed with auto choke on so about 1200rpm. I moved piston one to tdc i can see the black coated filth on it whats a good way to remove carbon buildup without pulling the heads ive heard about the water down the carb method but a bit sceptical on quantity etc.


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    Last edited by bfhoon; 15-04-2018 at 09:06 PM.

  2. #2
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    youtube video removed
    Last edited by bfhoon; 17-04-2018 at 05:51 PM. Reason: mistake

  3. #3
    Do you ever leave?
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    Default

    We cant tell much about the engine from a vid - just looks like an idling engine.

    You may have worn rings or worn valve seals, low comp causing inefficient burn - all these are a $$$ fix IF indeed they are a prob.

    HOWEVER, one thing that we can tell looking at the vid is that the engine is not about to spontaneously burst into flames or implode.

    Just step back for a moment mate; you are looking at cleaning dirty pistons . . . Don't overthink it! Don't go looking to fix problems that may not be there. Drive your car and enjoy it; it is not going to explode.

    If you want more, save your $ and have your engine rebuilt or build another. Then you will know your engine is fresh, you will know what you have and what performance to expect.

    Disclaimer though; I know peeps that have spent coin on a new engine, more coin than they could afford, and they lost the passion. With the benefit of hind sight they look back and say 'I should have kept the old engine - there was absolutely noting wrong with it, it ran fine.'

  4. #4
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    HI
    Smoke on start up is guide seals/orings

    Anyways compression can still be good and get a little oil usage .
    This just means the 2nd and oil ring are getting tired

    Dry and Wet Compression test all cylinders within 10%

    Leakdown test all cylinders under 5 % great 5-10 % borderline Over 10% needs repair
    Race engines are real strict on this over 5% rebuild time . Some builder aim for less than 3% leakage

    Ignition inspection required

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