[Diy_efi] injector placement

[The Punisher]

Thanks Ron, Thats what I've thought would be the case for a long time, but 
everybody seems to be realy hung up on placing them as close to the valves 
as possible. The problems of allowing the runner walls to get wet IMHO are 
totaly exagerated.
Thanks for the info.

Marvin Fugate


From: Ron Schroeder <rjs at bnl.gov>
>Reply-To: diy_efi at diy-efi.org
>To: diy_efi at diy-efi.org
>Subject: Re: [Diy_efi] injector placement
>Date: Tue, 25 Jun 2002 08:14:55 -0400
>
>Hi Marvin,
>
>With my 2.5L inline 4 cyl engine, I can place the injectors either at the
>bottom of the runners about 2.5" from the valve or at the top of the 
>runners
>just below the butterflies.  The intake is an independant runner style with
>about 9" runner length and 4 32mm throttle bodies.  The engine has a 
>redline
>of 4500rpm and with carbs the torque peak was at 2000rpm.  I don't have
>access to a dyno but full throttle acceleration times were the same with
>either placement but part throttle control and idle is noticably better 
>with
>the injectors just below the butterflies.  When driving off-road in the
>lowest range without touching the throttle, the speed doesn't bog down as
>much with the higher injector placement.  Highway fuel economy is slightly
>better too (about 4%).
>
>Ron Schroeder
>WD8CDH
>day 631 344-4561
>nite 631 286-5677
>
>----- Original Message -----
From: "The Punisher"
>
> > I've had this theory for quite a while, that injectors placed farther
> > up-stream in the runner will atomize better than cose to the valve like
>most
> > people seem to do right now. But I dont have any tests to prove or
>disprove
> > this. Anybody have any experience trying it both ways?
> > Marvin Fugate
>
>
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