[Diy_efi] injector advance

[Greg Hermann]

At 2:52 PM 8/7/04, Adam Wade wrote:
>--- 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.

Check out some SBF's.

I don't know Russ, so no comment directly about him. BUT-- the fact that a
person does something for his entire living HARDLY proves that he has a
clue WTF he is talking about. Witness the knowlege level of typical
automotive magazine writers and automotive authors !!

Greg
>
>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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