On Sat, 12 Apr 2008 14:04:53 -0400, clare at snyder dot ontario dot
canada wrote:

On Sat, 12 Apr 2008 12:39:32 -0400, "Ed Huntress"
wrote:


"Ed Huntress" wrote in message
...

snip

Unless you go to the SME or MIT research sources...

That should be SAE, not SME.

And regarding the corners of the combustion chambers, that should be the
corners of the combustion *space*. Detonation is most likely to occur where
the piston meets the cylinder walls.

Detonation is most likely to This process takes a finite amount of time (which
is why detonation is much less of a problem at high speeds than at low
speeds). The hydrogen radicals "explode" as soon as they find a
molecule of oxygen to attach to - fire or no fire.
** Posted from http://www.teranews.com **

That is pure gobble-gook!

Detonation is the extremely rapid burning of the fuel-air charge, a
near explosion, and can happen at any engine speed. At low engine
speeds you typically hear it as a "pinging" noise but it can happen at
wide open throttle settings as easily. In fact a caterpillar 3516
"lean burn" engine that operates at, basically, wide open throttle is
equipped with detonation sensors because detonation can and does
happen at high engine speeds.

Detonation has nothing to do with "occur wherever fuel is exposed to
high temperature and pressure for an "extended" periods of time." Nor
does "The pressure and temperature "crack" the hydrocarbons into
hydrogen radicals and carbon."

What typically happens in high RPM detonation is that the mixture
leans to the point that it burns extremely rapidly, an explosion one
might say, rather then burning evenly.

What is amazing about this post is that here we have a device, an
internal combustion engine, that has been in existence for something
like a hundred years and still people don't understand it..... Thank
God we still aren't using buggy whips. Can you imagine what people
would be writing about them?





Bruce-in-Bangkok
(correct email address for reply)