Lean burn engines

[Stephen Webb]

> 
> 60-80% of the heat absorbed into the engine from the reaction is thru the
> exhaust valve, and it's guide.   Depending on the amount of heat generated
> you can exceed the thermal limits of the metal, and then it just blows off,
> similiar to the dome of a piston when detonation is present.   Also, when
> running that lean you might be in trace detonation, and localized heating of
> some components is even worse.

So is this to say "lean mixtures run hotter, locally, because of
detonation"?

Why is this not a problem with diesel engines, as they run lean most of
the time.

-Steve


----------------------------------------------------------------------------
To unsubscribe from diy_efi, send "unsubscribe diy_efi" (without the quotes)
in the body of a message (not the subject) to majordomo at lists.diy-efi.org