[Diy_efi] injector placement

[Greg Hermann]

At 10:14 PM 6/20/02, john smith wrote:
> Been thinking about fuel economy. Perhaps doing something to aid
>atomization or keeping fuel in suspension rather than sitting on the
>manifold wall waiting to be sucked into the cylinder. I am looking at
>motorcycle engines and from what I have seen carbs can be more economical
>and put out more power. The main reason for FI seems to be drivability and
>emission control. If you think about it fuel drawn from a carb jet is in a
>moving airstream all the time whereas the injected fuel is often squirted
>in when the valve is closed and probably turns back to liquid while it is
>waiting. Although I have read part of a SAE paper which said the fuel
>atomization and mixing doesnt take place until the last phase of the
>compression stroke.

You're on a productive train of thought here. Think "air atomization" and
timing the injection of finely atomized fuel with high velocity flow of air
in the intake port. Or, alternatively, perhaps developing a way to modulate
the jetting in  IR style Weber carbys electronically (a la the electronic
Quadrajets) might be a reasonable alternative approach !!

There _IS_ a reason why IR Webers get significantly better WOT BSFC than
injection does !!

Greg

Anyway, just wondering if anyone has seen different effects from different
placements.
>Thanks
>  bill.shurvinton at nokia.com wrote: What are you trying to do?
>-----Original Message-----
From: ext john smith [mailto:abc_efi at yahoo.com]
>Sent: 19 June 2002 03:53
>To: diy_efi at diy-efi.org
>Subject: [Diy_efi] injector placement
>
>
>where is the best position for an injector? close to the valve? pointing
>at the valve?
>thanks
>
>
>
>
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><P>&nbsp;Been thinking about fuel economy. Perhaps doing something to aid
>atomization or keeping fuel in suspension rather than sitting on the
>manifold wall waiting to be sucked into the cylinder. I am looking at
>motorcycle engines and from what I have seen carbs can be more economical
>and put out more power. The main reason for FI seems to be drivability and
>emission control. If you think about it fuel drawn from a carb jet is in a
>moving airstream all the time whereas the injected fuel is often squirted
>in when the valve is closed and probably turns back to liquid while it is
>waiting. Although I have read part of a SAE paper which said the fuel
>atomization and mixing doesnt take place until the last phase of the
>compression stroke. Anyway, just wondering if anyone has seen different
>effects from different placements.
><P>Thanks
><P>&nbsp; <B><I>bill.shurvinton at nokia.com</I></B> wrote:
><BLOCKQUOTE style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT:
>#1010ff 2px solid">What are you trying to do?<BR>-----Original
>Message-----<BR>From: ext john smith [mailto:abc_efi at yahoo.com]<BR>Sent:
>19 June 2002 03:53<BR>To: diy_efi at diy-efi.org<BR>Subject: [Diy_efi]
>injector placement<BR><BR><BR>where is the best position for an injector?
>close to the valve? pointing at the valve?<BR>thanks<BR><BR><BR><BR><BR>Do
>You Yahoo!?<BR>Sign-up for Video Highlights of 2002 FIFA World
>Cup<BR><BR>_______________________________________________<BR>Diy_efi
>mailing
>list<BR>Diy_efi at diy-efi.org<BR>http://www.diy-efi.org/mailman/listinfo/diy_
>efi</BLOCKQUOTE><p><br><hr size=1><b>Do You Yahoo!?</b><br>
><a
>href="http://rd.yahoo.com/welcome/*http://fifaworldcup.yahoo.com/fc/en/spl"
>>Sign-up for Video Highlights</a> of 2002 FIFA World Cup



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