[Diy_efi] Timing Advance Curve?

[Phil Hunter]

> The limitation is that at the onset of detonation EGT will
> rise sharply.

BZZZT!!!

In normal combustion, there is a "boundary layer" of air (or
A/F) that "sticks" to the metal surfaces and acts like an
insulator between the combustion temps and the metal. The
shock waves from detonation "scour" this layer away, exposing
the metal to the high temps, metal temps skyrocket, combustion
temps plummet.

So, EGT *DROPS* w/ detonation, you're in for a big surprise
if you are expecting it to "rise sharply".

rgds,
philh
(digest)

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