[Diy_efi] sequential injection timing

[Bruce]

----- Original Message -----
From: "Mark Claywell" <clay0052 at umn.edu>
Subject: Re: [Diy_efi] sequential injection timing
> > Ever look at the injector pattern, at short pulse widths in slow
motion?.
> > An intake valve is closed 3/4 of the time.   So like I said earlier, the
> > trick is getting the backflow of exhaust to atomize the fuel.
> > I have yet to hear of an oem firing the injector in what we'd call a
> > conventional engine at any time other then valve closed.  If you read
> thru
> > the GNTtype archives you can read up what happens when you try to fire
> the injector at an open intake valve.

> Talk to someone who is running a racing engine and not a street engine.

Ya dem 10 sec GNs prowling the streets are a bad example of hipo street
engine.

> Guaranteed the are running on a partial or all open valve. Especially an
> engine  that is geared more towards racing. Almost all japanese 4 banger
> engines will benefit from open valve injection timing. Once again, not
> saying all engines will benefit, as it is often quite engine and setup
> specific.

Once you cross more then about 25% DC the whole issue is mute.  The only
place you see any gains with SEFI in a racing engine is when your out of min
operating time for idle.   And even then a double/dual batch fire works just
as well.
Just out of curiousty have you actually scoped a japanese engine and seen
that it was firing at an open intake valve?.
Bruce




> > Bruce
> >
> >
> > ----- Original Message -----
> > From: <Djfreggens at aol.com>
> > To: <diy_efi at diy-efi.org>
> > Sent: Tuesday, July 30, 2002 10:29 AM
> > Subject: Re: [Diy_efi] sequential injection timing
> >
> >
> > im not a EFI guru but the obeject is the same as in a carberator.
> sheerin=
> > g
> > the fuel into vapor. most likely the best way to do this is to create a
> 9=
> > 0=B0
> > angle to airflow. keeping the injector close to the vavle is crucial for
> > good
> > dry flow chareteristics but its not nearly as importnat as sheering the
> f=
> > uel
> > into vapor. the optimum placemnt for the injector would be right before
> t=
> > he
> > short side radious in the intake port. and the timing would have it
> squir=
> > t
> > right as the valve began to open. thats my 2cents.



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