[Diy_efi] injector advance

[Adam Wade]

--- Gary <gas- at charter.net> wrote:

> In reality, it is directed on the port wall or
> floor.

Yet intake wall wetting is much less of a factor in
injected engines than carbureted.

This one you got completely wrong.  And if you don't
agree, you can argue with Russ Collins of RC
Engineering, who only does fuel injection as his
entire business, as he (and a number of Tier 1 OE
suppliers' engineers) confirm that, yes, port
injection shoots for the back of the intake valve(s),
and specifically AVOIDS the walls of the intake tract.

I am sure I don't have to mention to you, with your
engineering background, how the space between misfire
and detonation becomes razor-thin when dealing with
fuel puddling in the intake...

  (A good reason
> not to polish the intake port, even for port
> injection.)  Even MY
> phrase 'spraying at closed valve' was a bit of a
> misnomer, or a
> little misleading.
> 
> This post just to add a little more to the validity
> of the 'bear
> dribble syndrone'.
> 
> GAS
> 
> ----- Original Message ----- 
> From: "Gary" <gas- at charter.net>
> To: "A list for Do-It-Yourself EFI"
> <diy_efi at diy-efi.org>
> Sent: Friday, August 06, 2004 4:18 PM
> Subject: Re: [Diy_efi] injector advance
> >
> > ----- Original Message ----- 
> > From: "Greg Hermann" <bearbvd at mindspring.com>
> > To: "A list for Do-It-Yourself EFI"
> <diy_efi at diy-efi.org>
> > Sent: Friday, August 06, 2004 2:11 PM
> > Subject: Re: [Diy_efi] injector advance
> > >
> > > Injecting against the back of the intake valve
> is a CRUTCH, used
> > > to compensate for the fact that most
> electromagnetic injectors
> > > do NOT give good atomization.
> > >
> > > Use an exhaust grade material (read more
> expensive) intake valve,
> > > and don't worry about cooling it.
> >
> > The intake doesn't get that hot in the first
> place, to require exotic
> > exhaust valve material, so need for additional
> cooling is a mute
> > point, even for F.I. (forced induction)
> applications.
> >
> > But is this practical, or even relevant to the
> original ? in this and
> > referenced archived thread?  If not, I personally
> consider it engineering
> > dribble.
> >
> > > Greg
> 
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> 


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