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What oil is best? and what ratio?

Discussion in 'Chainsaws' started by DexterDay, Dec 28, 2015.

  1. bwalker

    bwalker Pinnacle OPE Member

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    On high performance engines I have seen that sort of damage happen in seconds.
     
    Last edited: Nov 8, 2018
  2. 3browns

    3browns Well-Known OPE Member

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    What would or could be the cause of catastrophic damage that bad in a matter of seconds?
     
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  3. andyshine77

    andyshine77 Super OPE Member

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    I just looks like damage that was done over time IMHO, not sudden catastrophic failure.
     
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  4. bwalker

    bwalker Pinnacle OPE Member

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    Detonation.
     
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  5. bwalker

    bwalker Pinnacle OPE Member

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    On a saw you are probably right.
     
    Last edited: Nov 8, 2018
  6. 3browns

    3browns Well-Known OPE Member

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    So are we back to some sort of fuel related cause?

    The repetitive nature of the damage kind of rules out part failures I would think

    Or are we sticking with "operator headspace"...
     
    Last edited: Nov 8, 2018
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  7. bwalker

    bwalker Pinnacle OPE Member

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    Air leak induced lean question would be my guess.
     
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  8. bwalker

    bwalker Pinnacle OPE Member

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    Of all the seizures I have seen only one could be attributed to fuel and that engine was very marginal for pump gas compression wise. The rest were caused by lean conditions as a result of mostly air leaks, but some times temp.
    Given the low compression ratios of saws I would wager that just about all burn downs are a result of air leaks or severely lean carb settings. Even with really lean carb settings its tough to burn a saw down.
     
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  9. junkman

    junkman Crush it

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    You left out operator error ,some people should not be around 2 strokes.
     
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  10. bwalker

    bwalker Pinnacle OPE Member

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    If the carbs set right and there is at least some oil in the gas a two stroke OPE engine is very tough to kill.
     
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