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Detonation? Is there a fix?

Discussion in '40- & 55-Series Tech' started by tonkota, Jun 27, 2005.

  1. tonkota

    tonkota

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    How can I tell if my engine is suffering from detonation? And if it is, how can it be fixed?
     
  2. dgangle

    dgangle total rice SILVER Star

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    higher octane fuel and/or adjust the timing. Don't ask me to what unless its a SBC, in that case its 36-38* total advance.
     
  3. mr_manny

    mr_manny

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    If you listen for It, you should be able to hear a motor ping.
    Another sign of too much advance is if your motor diesels when you shut it off.
     
  4. Doug_S

    Doug_S

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    I've had the same problem when I don't use premium unleaded gas. It shouldn't be a problem with a 7.8:1 compression ratio but it is. If I back off the timing, the engine runs hotter so It's definitely a trade off.

    I run with the stock timing and with premium gas...just the cost of running a cruiser :) .
     
  5. tonkota

    tonkota

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    I have been running premium. The engine was also pinging with low grade.

    So, detonation, is just pre-ignition or ignition at the wrong time. I'm good then.

    Thanks.