[Diy_efi] injector placement

[Bruce]

----- Original Message -----
From: john smith
 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.

EFI or Carbed, the intake valve is closed 75% of the time.   The fuel being
carried in the air stream as the valve closes, still winds up puddling on
the back of the valve.   There is a huge amount of atomisation as the valves
go thru the overlap period.

 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.

Some of the bikes are placing two injectors in each intake stack, one right
by the intake valve, and the other at the end of the stack as far as
possible from the intake valve.
Bruce

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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