old-school bosch injection (cis) question/s

[Jörgen Karlsson]

I think that it is safe to plug it, but I will try running the idle air that
way on mine. I have managed to install the throttle body so I need to remove
it to set the throttle stop.

There is a small ortifice in the hose leading to it, on my 200tq it was
connected to the intercooler. Most of the idle air must go that way since
the throttle is fully closed and the idle valve disconnected on my car.

http://quattro.xrs.net
Jörgen Karlsson
Gothenburg, Sweden.

> -----Original Message-----
> From: owner-diy_efi at diy-efi.org [mailto:owner-diy_efi at diy-efi.org]On
> Behalf Of Camden Lindsay
> Sent: Tuesday, July 31, 2001 2:24 AM
> To: diy_efi at diy-efi.org
> Subject: old-school bosch injection (cis) question/s
>
>
> Hello,
> I was new to list a couple of months ago, and have just been watching the
> talk.  I realize this may not be quite on topic with most of the
> discussions, but i have a question reguarding the older style air
> jacketed
> bosch cis injectors.
> On CIS injected motors the heads have air jackets for the injectors built
> into them, attatched to the intake manifold (plenum)via a
> "breather" hose.
> I am wondering the reasoning for this-- to help "swirl" or whatever the
> injector's output?
> The reason i am questioning the reason for these is as follows...
> I own an 84 audi 4000csquattro with an 83 5000 turbo motor in it.
>  I am in
> the process of converting it to pulsed rail injection (kind of
> rigged, but
> it should work...using a bosch LH 2.4 unit and harness from an 89
> saab 900
> turbo, splicing in one extra injector since they are batch
> fire... slightly
> larger injectors (30lb) and messing with fuel pressure at the
> rail to help
> with mixture-- the saab and audi use the same stock ignition
> system--amplifier, pickup, coil-- only difference being that the ecu will
> think the motor is running 1/5 faster than it is-- because the audi is an
> inline five rather than a four ). The pulsed injectors fit into the holes
> for the CIS  injectors using  small resin inserts from a corrado
> g60 (or a
> couple of other vw's/etc).
> I am wondering weather to leave this "breather" hose the way it is, or to
> cut it off and block the passageway.  I have had one person that has done
> such a conversion tell me to plug it, but he never specified why or if he
> had tried leaving it open.
> As far as i can see there would be no problem leaving the hose
> intact-- but
> i'm no expert.

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