DIY WB update

[Bruce]

Yep, we're inna zone here
Bruce



----- Original Message -----
From: "Keith" <kgil1 at tampabay.rr.com>
To: <gmecm at diy-efi.org>
Sent: Wednesday, August 15, 2001 1:08 AM
Subject: Re: DIY WB update


> Bruce,
> Check the date on you computer. I think you're living back in 1998.
> Your emails have a 98 date stamp.
> later
> Keith
>
> Bruce wrote:
> >
> > From: "Greg Hermann" <bearbvd at cmn.net>
> > Subject: Re: DIY WB update
> >
> > > At 12:30 AM 8/14/98, Bruce wrote:
> > > >Speaking of lean cruise.
> > > >I can't find any real big gains in going real lean anyway.  Still
need to
> > > >burn x amount of fuel to make a given amount of power to actually
move
> > the
> > > >car.  Maybe, better results, in a lighter car, but then you give away
all
> > > >the road hugging weight.  the instant you have to run more throttle
> > opening
> > > >from the leaner AFR, then your using more fuel anyway due to the
greater
> > air
> > > >flow.  While you might run 10% leaner, if you have to use more
throttle
> > > >opening you might be using a larger total amount of fuel.
> > > >Just completely the opposite of what pumping loses would dictate.
> > > >Again, theory falls short of real life....
> > > >Bruce
> >
> > > Gearing is part and parcel of tuning. Gotta go to a taller gear along
with
> > > the leaner af ratio--which cuts the quantity of air back down to where
it
> > > was before the throttle got opened a bit more. The extra load on the
> > engine
> > > from the taller gear allows the wider throttle opening and consequent
> > > reduction in pumping losses.
> >
> > Also, that assumes that the engine is still operating in an efficent rpm
> > range.   It's easy to lug and engine with too much gearing and then have
> > even worse economy.
> >
> > > Part of the reason for higher power on the rich side of stoich is
> > selective
> > > burning of the hydrogen in the fuel before the carbon gets burned. The
> > > hydrogen fraction has a higher heat of combustion than the carbon
does,
> > > hence more heat and power for a given amount of air with a somewhat
rich
> > af
> > > ratio, but less mileage because not all of the fuel (some of the
carbon
> > > part) is being burned.
> >
> > Isn't that the reason for having to add timing, when going, leaner?.
> > Bruce
> > >
> > > Greg
> >
>
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> --
> Keith Gill F.A.S.T.
> Riverview, FL
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