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Detonation and Pre-Ign. are 2 different situations (archive)

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Posted by RHO on May 18, 2001 at 01:11:48:

In Reply to: Jim C chip makes noticable gains, but... posted by Austin on May 17, 2001 at 12:05:57:

From what I have been told... correct me I'm wrong engine guru's... Detonation occurs during the up-stroke where the gas burns unevenly caused by high compression, low octane, hot spots on the pistons(carbon glowing) etc...

Where as Pre-ignition (much worse) happens when unburned gas ignites when the piston is at the very bottom of it's stroke while the valves are open which could be castostophic (bent valves and the like)...

Detonation can be audible as 'pinging' where Pre-ignition is a very loud explosion...



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