RE: Webers or Spica?

["Jason Hagen" <hagen_jason1@domain.elided>]

Pressure is just one component in achieving a highly atomized fuel spray.  
Injector design, metering plate characteristics, pulse width, sac volume, 
pintle shape, intake manifold design, pressure, etc. all contribute.  Much 
of Spica pressure is likely wasted on just opening the injector.  Plus, the 
design of the injector would likely be poor in terms of mechanically 
contributing to an atomized spray.  Spica likely relies on a hot engine and 
loose emissions standards (at the time) more than current EFI systems.  
Spica would be lousy during cold start, but gain ground once the engine is 
warmed up.

-Jason Hagen




> From: "John Katos" <john_katos@domain.elided>
> Reply-To: "John Katos" <john_katos@domain.elided>
> To: "Zamani Zambri" <zzambrimail@domain.elided>, <alfa@domain.elided>
> Subject: RE: Webers or Spica?
> Date: Thu, 21 Nov 2002 15:47:55 -0600
>
> -----Original Message-----
> >>The atomization from virtually ANY injection system (unless air
> >>shrouded injectors or compressed air boosted injectors are used) does
> >?not even APPROACH the level of atomization of the fuel which is
> >>achieved by Webers.
>
>
> >Why do you say so? Do our modern day efi systems with high pressure
> >fuel(s) rail still not atomize better than carbs? Don't carbs rely on
> >engine vacuum as opposed to high pressure fuel spray of a modern efi? I
> >still cannot see why carbs atomize better. Unless of course you are
> >comparing to the SPICA setup.
>
> ______________________________
>
> Zamani,
> > Unless of course you are comparing to the SPICA setup.<
>
> If your first statement is correct then the above statement does NOT
> make sense, since unless I am mistaken the Spica pressure is higher than
> an EFI system.
>
> John Katos
> West Dundee, IL USA
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