8d • General discussion
What knock margin means
What knock margin means (simple)
Knock margin = how much safety buffer you have before knocking starts.
- More margin = you can run more timing / more load before knock.
- Less margin = knock happens sooner, so you have to back off.
Why hotter IAT/ECT reduces it
Hotter charge/chamber = the mixture is closer to auto-igniting, so you have less room to push timing or load before it knocks.
Quick analogy:
If the knock limit is a “redline temperature,” hotter IAT/ECT starts you closer to redline → less margin.
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What knock margin means
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