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Spark knock

May 27 2008 at 5:13 PM		Greg  (Login GregMason)


Response to detonation?
Bill, when you hear spark knock that is detonation. An engine can stand small amounts of spark knock and still live a long time but severe spark knock is trying to tell you something. It is a resonance or vibration of the block, and computer controlled engines use a knock sensor screwed into the side of the block to detect this. It sends a small voltage to the computer which in turn pulls timing out until the knock goes away. Detonation is uncontrolled combustion after ignition. Pre-ignition is spontaneous combustion before ignition. Similiar results though. UGLY!

Greg

 
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