Injector mounting in manifold.

[Alan Pritchard]

Been wandering something similar myself. After I bought my injectors and
realised they may be undersized, I started thinking about mounting the 6th
one in an aluminium pipe which will form my inlet tract before the tb. I
figured I'd make provision for it and leave it disconnected until necessary.
What is everyone's opinion on this, ie, 1 injector per runner + 1 injector
just before the throttle body?

Best Regards,

Alan Pritchard,
Mechanical design engineer,
Network administrator.

Seaeye Marine LTD.
+44 (0)1329 289000
www.Seaeye.com

 -----Original Message-----
From: 	Jim Green [mailto:jeg1976 at yahoo.com] 
Sent:	02 April 2004 05:05
To:	Ben Swann
Cc:	Quattro list
Subject:	Re: Injector mounting in manifold.


--- Ben Swann <benswann at comcast.net> wrote:
> On a '87 5000 turbo quattro which will get
> supplementary fuel injector - I am considering
> mounting an injector into the flat portion of the
> intake manifold just post throttle.  A cold start
> injector would go perfectly there, I think.  
> 
> Any BTDT on this, do's or don'ts? Will the CS
> injector work fine as a pulsed supplementary
> injector.  Are there other suitable fuel injectors
> that have this type of flange on it?  Even if the CS
> injector is not the correct one, I'd like to
> provision the manifold to use the same fitment  that
> the Cold Start injector has while I have access to
> tap the holes for the injector and flange bolts.


Ben, sorry, but that simply will not work.  You want
the fuel to get into each cyl as evenly as possible. 
The only way to get it right is before the TB where
the MM hose should be, or mount an injector in each
runner.  Whatever you do, go in baby steps and check
your plugs after tunning to make sure they're the same
color and you're not running lean in any cylinders. 
Also, I think the CSV is designed more as a on/off
valve than a high speed pulsed valve. You'll want to
use a plain old fuel injector.

HTH

=====
Jim Green
'89 90tq
'89 80q
http://www.mswanson.com/~jgreen/car_home.html

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