Sequential vs Batch Fire

[Bruce Plecan]

> > 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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