964 intake manifold to 3.0/3.2 port adapters

[Robbbyg]

Steam Driver Nice Barn Find!!

[Steam Driver]

Hi again Tom.

Yes, relieving the ports in the SC head would definitely be possible; plenty of material there for that. If I was working with heads not installed, etc. I would probably go that route. ' matter of fact, one of our fabricators, an old hot rod guy, says he can do it with the heads installed and not get any filings in the engine. Not a risk I want to take. This idea about using the 964 intake didn't come about until the long block was reassembled.

Also this route leaves the heads themselves stock. I don't know if that matters in the long run or not.

[Steam Driver]

Thanks, it is a really nice SC. Unfortunately the broken head stud thing has led it into being a lot more protracted project than I anticipated. Not to mention the P/O's unknown (at the time) alterations. It has been a fun trip discovering things though.

[drb930]

Originally Posted by Steam Driver

For anyone's information (although this may be superfluous; there seems to be some knowledgeable people on this thread), adapters for going from the 3.0 and 3.2 heads will not be interchangeable. The injector boss/bore on the 3.2 goes in a much steeper angle than the CIS injectors and if this is installed on a 3.0 head you will find (as I did) that the injector relief in the port shrouds the injector bore. This is with the big port SC heads; the small port versions would be marginally worse. Not that it matters; neither would be compatible.

I know this because when we were doing Supercharging of Knoxville we had CNC adapters for going from the 3.2 heads to our own manifold for using the Auto Rotor blower. I am currently wanting do exactly what you are proposing, on a 3.0. When I was doing a trial fit I found that out. But except for the "minor detail" about the injector bore being partially covered they would have worked great.

So, if you want to do a 3.2, I can fix you up with those (we have some left over laying around). But they won't do a 3.0. However we're working on that since I want them and my partner might also. Particularly since it seems there might be a market.

I'm going to use the 964 intake plenum with (at least initially) the 3.0 TB; it will bolt up to the 964 plenum directly but does require an intermediate piece to account for the difference in diameters to account for the (very slightly) differing seal diameters. I made one out of phenolic. Doesn't look as sexy as ITB's, but as they say "if it was good enough for Porsche," etc. I initially was going to use the CIS intake, gutted, but the 964 parts turned up in my partner's garage (more SoK leftovers). It's obviously has (or at least should have) a lot "slicker" airflow than the 3.0.

If anyone is interested in the 3.2 parts I can send you pics of them and see about a price. Just send me your e-mail via PM.

Any chance you would still have any of this stuff 4-Sale?

[trond]

i used these from adapt motorsports. Beautifully made

[ToySnakePMC]

Adapt Motorsport - great fit. I ordered the small 34mm version for my 1982 3.0 - and then later had them ported to 37mm by Anchor Atlantic machine shop in southern NJ when they reworked my heads for recent engine build. Adapt makes some very nice looking - and working - components. Second photo shows their matching fuel rail. Lots of photos in my build thread in the Technical forum. Thx, Patrick

[11BC2]

Originally Posted by ToySnakePMC

Adapt Motorsport - great fit. I ordered the small 34mm version for my 1982 3.0 - and then later had them ported to 37mm by Anchor Atlantic machine shop in southern NJ when they reworked my heads for recent engine build. Adapt makes some very nice looking - and working - components. Second photo shows their matching fuel rail. Lots of photos in my build thread in the Technical forum. Thx, Patrick

That looks like a really nice set up you have there!
Forgive my ignorance, but what intake manifold are you using?
I am asking, because I am rebuilding my 2.7 magnesium case for my 74 Carrera and I’m ditching the CIS.

[ToySnakePMC]

Thx. These are 964 aluminum intake halves. Porsche also offered these in plastic if you’re in search of more weight savings.
Here’s some pics and details on how I relieved the alum pieces of various cast-in brackets and such.

https://forums.pelicanparts.com/porsche-911-technical-forum/1122278-9126001675-3-0l-coupe-nc-ownership-updates-3.html