Big Injectors in Little Engine?

[Bruce Plecan]

Slippery slope on lowering fuel pressures.
Just remember, as you reduce the pressure, the fuel exiting the injector,
has less inertia, so it doesn't get as close to being sprayed on the back of
the intake valve.  That results in poorer vaporization.   There was some
stuff about raising the FP made for better atomization, I think it's about
getting more fuel hotter.  Course, this is just how I seez it
Bruce




> From a mechanical standpoint, you can reduce the amount of fuel pressure.
I
> don't have a formula to calculate it. I don't think it's directly linear
> because of the pressure/vaccuum of the manifolds, but I also haven't had
> time to put any long thought into it. So this is just my $.01
> Might turn into ALOT of $.01's if I can't reprogram my Nissan ECU...
>
> PS. There are also operating voltage and resistance issues to verify. Not
> all injectors are controlled the same.
>
> HTH, Chris P.
>
>
>
> > Are there any comments on this line of thought? ->>>
> >
> > What if I was to put a set of SVO 24 or 30# injectors in a 305 TPI MAF?
> > They're cheap, and it would offer me peace of mind (kind of like the new
> > harness did). Could they be tamed to work well in a 305?
> >
> > The rationale is to replace the existing suspect injectors while
planning
> > (budgetarily) for future larger-displacement applications. What kind of
> > issues am I likely to run into? Obviously, the FI sizing params will
need
> to
> > be spec'd out. S-Ware mods are within grasp. There may be more
fundamental
> > issues though, right?
> >
> > I'm guessing there may be some problems with the pulse width correction
> > requirements at small-width ranges, because the larger injectors will be
> > open for a much shorter duration particularly at idle. Thus, the effect
of
> > delays and such opening/closing may become more significant and require
> > compensation. Perhaps as the pulse width becomes quite small at idle
(like
> > 500RPM 305 would ask for), the fuel delivery would become inconsistent
as
> a
> > result of the predominant open-close time. There has been discussion
here
> > recently on related issues, so I wanted to feed from your experiences if
> > possible.
> >
> > Since I'm considering this near-term, I wanted to place it before the
> group
> > for comment and judgement. All answers welcomed.
> >
>
>
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