Timing valleys

**robof16** · January 14th, 2012

Did some searching and haven’t found anything…
Always wondered why the timing tables have the distinctive valleys in them. I expected the timing to be somewhat linear as RPM increases.
Any insight?

**killerbee** · January 15th, 2012

valleys exist where transient "load" is typically being increased by the operator with his foot. Any time load is higher, the auto-ignition begins earlier and progresses with more speed, hence a timing retard is called for.

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