Lean burn engines

[Bruce]

Diesel engines are designed to run in the realm of detonation.  Take a look
at the guts of a serious Pulling Tractor sometime.  Bearings are almost an
inch wide,  lots of mass for absorbing heat, huge cooling systems.  A lopo
diesel runs 14:1 CR.  We run 16:1 in *our* puller at 60 PSI of boost.
Valve seats .1" wide, Rings well placed down from the piston crown.  All
kinds of little tweaks.  AND LOTs of fuel for cooling!.
Bruce




From: "Stephen Webb" <swebb at netlab.uky.edu>
Subject: Re: Lean burn engines
> > 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


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