Installing Weber Carbs

[si2t3m]

Don,

what kind of intake manifolds are you putting between the carbs and the heads??? Early intakes?

Here is my setup on a 3.0L from a 1978 911 engine (38 or 39mm intake ports).
Weber carbs
Weber Intake manifolds bored out to the side of the intake port on the 3.0L heads.

So from the heads to the carbs it's like this:
Heads-gasket-insulator-gasket-manifold-gasket-carb.

If you are using manifolds made by PMO that are specific for the 3.0L then you might not need the insulator. The weber manifolds when installed on a 3.0L dont cover the intake port properly. Well they do cover it but just by a hair where the half round area is for the injector on the intake port. You will drive aroud for a while and the gasket will get sucked in the intake port in this area creating a vacuum leak.

Why not call/fax PMO and get this straight. He makes insulators and the proper gaskets for this.

Marc-André

[si2t3m]

One other thing. then insulators are a good thing with carbed engines.

Like preventing the gas from boiling in the bowls...

Marc-André

[don hopkins]

But the tech guy at Pelican said they are only for early engines.

[don hopkins]

Does anybody have a phone number for PMO? I don't have a fax machine. Or if you have a fax send one for me asking if intake manifold insulators are needed for converting a 1981 SC 3.0L to Weber 40 IDA 3C carbs. If so tell them I need to order them and my number is 215-356-7971. Thanks!

[Randy Webb]

Can yo send a fax from your computer?

I hear he doesn't like Email or phone...

[Steve@Rennsport]

Hi Don:

PMO doesn't take phone calls and instead, works mostly through his dealers.

One should always use insulator kits for ALL carburetor installations due to the volativity and vapor pressure of today's gasolines. This prevents the float bowls from percolating during heat soak and flooding the engine with fuel.

That results in engine fires and in some cases, bent rods from hydrolocked cylinders.

[Tyson Schmidt]

Originally posted by Randy Webb
Tyson how do you set it up or modify it for use in a "recirculatory manner."? What hose runs where to recirc.? What other items do you need besides the pump & hoses - a holding canister?

PMO sells a fixture that has an inlet and return, then there are two outlets from that going to each carb. It has a gauge built in and a restrictor on the return for setting pressure.

[si2t3m]

Originally posted by don hopkins
But the tech guy at Pelican said they are only for early engines.

OMG!!!

Wayne.... Time for some serious head slapping



Marc-André

[don hopkins]

I have finally talked to somebody in person who seems to be an expert, Bob Fox of German Car Service of Ambler, Pa, who has worked on Porsches and BMWs since the early 60s when Wayne was in diapers (my words not his). He says yes insulators or spacers are a good idea, also needed is a regulator with a gauge built in. Finally, he said another problem is clearance with a AC condensor. But since high stacks lead to better performance, I may need to find a filter that takes up very little room.

Don

[Randy Webb]

Tyson -- do you mean their "fuel pressure control unit"?? From the web site description I thought that was for use when you _keep_ the higher pressure CIS fuel pump.

No?