[Diy_efi] Intro, and q's about fuel economy

[Bernd Felsche]

On Mon, Dec 16, 2002 at 10:32:41PM +0000, Mike wrote:
> At 11:47 PM 15/12/2002 -0800, you wrote:
> >It's simpler than that.  The exhaust gases already have fuel in
> >them to some degree.  You recycle that in place of actual fuel.
> >The only way to eliminate throttle losses is to have no throttle
> >at all.  You then do the throttling via modulation of the valve
> >timing.

> Is this an april fools post or am I missing something, do you class
> the rather less than 0.2% of available fuel in the exhaust as
> 'exhaust gases alread have fuel in them to some degree' ?

I'm still trying to get up off the floor from laughing.

Cooled EGR is used as an _inert_ gas by several manufacturers to
reduce the effective cylinder volume and to reduce the tendency to
knock while maintaining a high cylinder pressure. (e.g. VW in their
FSI and Toyota)

> I would have thought the 0.2% or less to be negligible in terms
> of adding fuel to a cylinders mix for its next power cycle ! !

Shhh.. some people are into "recycling". ;-)

> >What you want is an engine configuration that requires no
> >enrichment (use EGR for enrichment) and has a flat torque curve.
> >You can cam the little motor to peak torque really early, but a
> >fully variable cam timing would be the best.

> Huh - I am definitely missing something here, 'use EGR for enrichment',
> pray tell what 'degree' of enrichment would you expect ?

I need another laugh as well.

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