3.0 intake port size/boxster adaptor

[jhelgesen]

Hey guys, had some spare CAD time on my hands lately, started working on my 3.0 to boxster manifold project again.

Does anyone have a 78-79 3.0 head or engine around that they can measure the intake port? Mine is still in the car and in storage 2 hours away.

I need to consider how to transition from the oblong hole shape of the boxster intake to the round 911 port.

This is the shape of the boxster intake.

[jhelgesen]

Played some more last night. Don't think I want a direct step between the manifolds, anyone have any recomendations on transitioning the two ports?

[BURN-BROS]

John, what program? use loft cut to transition between 2 shapes

[jhelgesen]

I'm using both Solidworks and CATIA. SW is certainly more friendly, but Cat is what I have to use at the office.

I'd love it if I could find a model of the engine block to fit the entire thing to before I end up pulling the motor out of my car.

[jhelgesen]

Here's what I came up with today.

I layed out the boxster flange against the 911 intake ports, estimated a 35mm port opening on the 911. The oval/triangular shaped gasket on the boxster intake hung directly over the studs for the 911 intake, so I shifted the boxster part over 8mm. I then put a surface between the two openings and extracted it, and made a cut out for the injector spray angle.

My concern is will having the angle of the port do anything strange to the incoming fuel/air pattern.

Overall view.


Close up of port shape.


Top view of boxster gasket against adaptor.

[JohnJL]

Wayne's book says 39mm for all non-turbo cars...cool project

[jhelgesen]

Thanks to JohnJL, and looking in Waynes engine bible, found intake port dia is 39mm. Update the adaptor to this dia. Measuring area of both shapes, they come out about equal.

Thinking of modeling the rest of the intake, boxster parts, and the Ford throttle body I have. I think the Boxster TB is probably too big a diameter.

Todays progress:

[jhelgesen]

Latest update, going to 6 single adaptors.

[ChrisBennet]

Any more news on this? I'm thinking it might be a nice setup for my 3.4 (from 3.2).
-Chris

[jhelgesen]

Hadn't done a thing with it, went with webers on my car.....

I have the boxster intake in a box if anyone is interested.