"Andrew Gideon" wrote in message
news
On Wed, 27 Sep 2006 09:20:12 -0500, Dan Luke wrote:

*Improper* LOP operating technique can harm cylinders, even cause
catastrophic failure by detonation.

Hmm. Detonation, if I follow all this correctly, yields lower EGTs. So
someone leaning by EGT could be fooled into thinking that all is well,
even while cylinders are being damaged. This is exactly the type of idea
I was missing; now I think I see.

But CHT goes up, right? Would it go up enough (ie. beyond 400) to raise a
pilot's concern?


http://www.avweb.com/news/pelican/182132-1.html

Pelican's Perch #43:
Detonation Myths

We've all been taught about detonation in piston aircraft engines. It's what
occurs when combustion pressure and temperature get so high that the
fuel/air mixture to explodes violently instead of burning smoothly, and it
can destroy an engine in a matter of seconds. Right? Well, not exactly.
AVweb's John Deakin reviews the latest research, and demonstrates that
detonation occurs in various degrees - much like icing and turbulence - with
the milder forms not being particularly harmful. Heavy detonation is
definitely destructive, and the Pelican offers some concrete data on how to
avoid it.
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