[Diy_efi] injector advance

[Ludis Langens]

Bevan Weiss wrote:
> 
> > Lastly, every major manufacturer I know of using port
> > injection (all motorcycle apps using it) inject onto the back
> > of the intake valve.  Do you know sometihng the OEs don't?
> 
> I don't know something the OE's don't.  The OE's are well aware that
> injecting straight into the cylinder is the preferred way of doing it.  GDI
> is the newest technology that proves this...  It's been preferred in diesel
> engines for a much longer time now. :P

You must "know" something because OE's don't inject "straight into the
cylinder".  In automotive SFI, it is customary to inject into the intake
runner when the intake valve is *closed*.  This (one) cools the intake
valve, and (two) helps evaporate the fuel for better mixing.

Direct gasoline injection is a different technology with different trade offs.

-- 
Ludis Langens                               ludis (at) cruzers (dot) com
Mac, Fiero, & engine controller goodies:  http://www.cruzers.com/~ludis/
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