Sequential vs Batch Fire

[Bruce Plecan]

> Why do you need a larger injector with sequential?

You don't

> What is the path that fuel takes on a batch fire engine?

??

> Do cylinders rod each other for fuel?

rob?
depends on manifold design

> Help me visualize what happens with the fuel in a batch fire set-up.
> The more I think about it, the more I think batch fire has to be really
sloppy.

Need reading the archives.
Very little actual difference other then at idle/ low engine speeds.
Bruce
>
> Dennis
>
> --- "Bruce Plecan" <nacelp at bright.net>
> > wrote:
> >> > For sequential injection you need big injectors as all the fuel has
to
> >go
> >> > through an open valve.
> >>
> >> Depends, on some engines the injector fires at a closed valve.
> >> The intake valve is only open for about 25% of one
> >
> > revolution
> >
> >replace with engine cycle  arrgh
> >
> >, so when the
> >> DC exceeds 25% then your shooting at a closed valve anyway.  Actually
in
> >
> >some
> >
> >replace with SEFI
> >
> >strategies the you have 2x as much time to fire the injector, then in
> >> say batch fire where all injectors fire 1x per crank revolution.
> >>
> >> >  Does using big flow injectors have an adverse impact
> >> > on the efficiency of fuel atomisation and controlability at idle?
> >>
> >> generally is getting so large that you can't cycle them fast enough at
> >idle
> >> to get them lean enough for a nice ideal.
> >>
> >> > I have heard for instance that with my car (365cc/min stock
injectors)
> >> that
> >> > someone using 550cc injectors (big h.p. application)  could not get a
> >> smooth
> >> > idle, -mind you that was with a 2-batches of 2 injectors E.F.I setup
(on
> >a
> >> > 1600cc 4cyl supercharged engine).
> >>
> >> I've heard as a rule of thumb that injector flow should not exceed
> >cylinder
> >> displacement.  Sounds like staged injectors, or a high rate Fuel
> >Management
> >> Unit
> >
> >is needed
> >
> >Apologies
> >Bruce
> >
> >> Bruce
> >> >
> >> > Nick Parker.
> >> >
> >>
>
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> >> >
> >>
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> ==
> Dennis Doza II
>
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