Forum Discussion
Sam_Spade
Jun 07, 2016Explorer
Bedlam wrote:
See these links about timing:
And both talk about the possible effect that too much timing advance can have on OVERALL ENGINE TEMPERATURE, not about it's affect on combustion chamber temperature.
Two things about that: If the overall engine temp is SO high that it makes a significant rise in the COMBUSTION CHAMBER temperatures, then it is REALLY hot and a little knock might be the least of your worries.
Secondly, once the overall engine gets really hot, simply retarding the spark, or other adjustments to bring down the overall engine temp will take a LONG time to have an impact on the combustion chamber temps.
I haven't had a lot of experience with engines overheating but the few I have seen start knocking bad about 3 seconds before there is a catastrophic engine failure......during which time an minor adjustment of anything is unlikely to help.
So to sumarize:
In general, ignition timing has NOTHING to do with PRE-IGNITION under normal circumstances. Spark knock and pre-ignition knock are two different things.
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