3.2 Intake Vaccum Line Diagram

jcc911 · 08-27-2007, 04:53 AM

Is there such a thing? Can one provide it?
I am trying to retrofit fit a 3.2 intake and I have all of these fittings were it seems vaccuum line(s) should go, but I am not sure where to. Especially the ones on top of the fuel regulators.

If someone could provide a diagram or detailed pics (with explaination) of where each vaccuum line runs, that would be very helpful and appreciated.

Thanks! J.

Rot 911 · 08-27-2007, 05:32 AM

jcc911, if no one else responds to this, bump it up to the top around 5 p.m. or so. When I rebuilt my 3.2 I took extensive pictures including ones that show how all the vacuum are run and what they connect to. Unfortunately the pictures are at home and I am at work.

sjf911 · sjf911's Garage

There are 3 vacuum connections on the front of the throttle body and 1 on the front of the left intake manifold. The idle control circuit is on the back of the throttle body (it bypasses the throttle body from the rubber boot to the intake manifold below the throttle body). The large connection on the back of the throttle body goes to the ambient air valve from the oil tank. One of the smaller goes to the vacuum side of the ambient air valve and the other splits through a Y-connector to go the the FPR and pressure damper. The large connection on the front of the left intake manifold goes to the brake servo but has a complicated course. A Y-connector comes off of this and goes to the 90 degree rubber boot above the throttle body.

The ambient air valve is shown below without the large hose.

Below is the large hose from the ambient air valve in red.

Below is the brake servo connection. Just right of the red hilighted part is the Y-connector that goes to the rubber elbow. The pipe connection to the rubber elbow is in the picture above.

Below shows the vacuum connections to the FPR and damper via the Y-connector from the front of the throttle body as well as the idle control bypass circuit of the throttle body on the back of the throttle body.

I used one of the small ports for the takeoff to the MAP on MSII and plugged the large port as I did not use an ambient air valve (there is a special takeoff on the oil tank of the carreras not present on earlier cars). I did reuse the entire brake servo hose setup and vacuum lines to the FPR and damper. I'll post pictures when I get home tonight.

jcc911 · 08-27-2007, 02:21 PM

thanks to both for the help and I look forward to the pics.

sjf911 · sjf911's Garage

Below is a picture of the front of the engine with the vacuum connections as I used them. The bottom picture is highlighted. The two small vacuum nipples are right on top of one another so may be difficult to appreciate. The bottom nipple goes to the Y-connector and the top is used for the MSII MAP.

jcc911 · 08-27-2007, 05:30 PM

Thanks Steve! what is the brake booster for? I am not sure if I would use/ need that. If I do not need this, would this get plugged. Remeber I am trying to build a turboed 3.0 with MS2.
So I will use the same upper for MS and the lower for the FPRs, Any idea where I can get those lines and elbows on the FPRs?

What about the large port on the front of the TB? I will be mounting an AAR there for warm up, can I put a line from that port to the AAR?

What about the vacuum advance line to go to the distributer, where does that go. THANKS AGAIN for your help! Jeremy

sjf911 · sjf911's Garage

The 3.2 did not have a vacuum advance as the advance was controlled by the Motronic DME. You'll have to split a line. As far as the break booster, I don't have any experience with turbo's so someone else will have to chime in.
The lines and fittings to the FPR are available here:

http://www.pelicanparts.com/catalog/shopcart/911M/POR_911M_FULmot_pg4.htm