[Fwd: Lean burn engines]

[Jan Ben]

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From: "Bruce" <nacelp at bright.net>
To: "Jan Ben" <ben at lucent.com>
References: <025501c1575d$b4eeabc0$0200a8c0 at ray> <03bd01bf18f6$b5c56fe0$290ac9d8 at bruce> <3BCEF4E5.F049E6F6 at lucent.com>
Subject: Re: Lean burn engines
Date: Mon, 18 Oct 1999 11:38:09 -0400
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Nope.
I like it this way just fine.
Bruce


----- Original Message -----
From: "Jan Ben" <ben at lucent.com>
To: "Bruce" <nacelp at bright.net>
Sent: Thursday, October 18, 2001 11:27 AM
Subject: Re: Lean burn engines


> Dude.. can you *please* set the clock to 2001 on you PC, it's really
annoying.
> You're making me want to unsub from diy alltogether.. :)
> thx
> Jan
>
> Bruce wrote:
> >
> > 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.
> >
> > Thermal barrier coatings will help, some.
> >
> > The engine mixture is actually a small consideration.  It's going to
take x
> > amount of energy to move a vehicle a certain distance.   Just actually
> > getting the tune right will get you close, all the exotic stuff is just
for
> > small gains.
> >
> > Using something more accurate then a ProJection would be my first
> > suggestion.  If you're going to run other then 14.7:1 (closed loop) then
> > you'll need to get 1/2 serious with the engine management.
> > Bruce
> >
> > ----- Original Message -----
> > From: "Ray Drouillard" <RayLists at quixnet.net>
> > To: <diy_efi at diy-efi.org>
> > Sent: Wednesday, October 17, 2001 6:47 PM
> > Subject: Lean burn engines
> >
> > > I have heard that running an engine too lean will cause it to run hot,
and
> > > will burn out the valves.  I have never seen an explanation of this.
Why
> > > does it happen.
> > >
> > > Generally speaking, how lean can I run a standard (normally aspirated)
> > > engine.  Specifically, (if it makes a difference), I want to improve
the
> > > mileage of my Jeep Wagoneer, which has an AMC 360 V-8.  It is fed with
> > > Holley Pro-Jection, and is fired with a Jacobs Omni-Magnum ignition
box.
> > >
> > > What can be done to an engine to allow it to run leaner.  The engine
is
> > > currently at the rebuilder (though he hasn't started yet), so I might
be
> > > able to get stellite valves or something like that.
> > >
> > >
> > > Ray Drouillard
> > >
> > >
> >
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> > >
> >
>
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