Can 50 PMO itbs work on a 3.2 SS?

[Classic 911]

Originally Posted by Axel84

Thanks 40/38 got it

Maybe Mr. "hylla" has a 3.2 Carrera head so you could measure the port size yourself


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[Evan Fullerton]

For what it’s worth, I told Bill at Xtreme I was building a SS 3.3L that would make peak power around 7200 and he still recommend a 42mm intake port to go with the 53mm intake valves. He wasn’t remotely concerned about loss in air speed on only a 3.3L

[winders]

Originally Posted by Evan Fullerton

For what it’s worth, I told Bill at Xtreme I was building a SS 3.3L that would make peak power around 7200 and he still recommend a 42mm intake port to go with the 53mm intake valves. He wasn’t remotely concerned about loss in air speed on only a 3.3L

My problem was mainly with the port size mismatch and having air bounce off the lip created by using ITBs with 43mm ports on 39mm intake port heads.

The problem with the ITB setup asked about is the combination of ITB size and port size on a 3.2SS engine. 50mm/43mm is just too big for a 3.2 street engine.

Also, My 3.746L race engine that makes 450 HP and revs to 8,000 RPM uses Xtreme heads with 52.8mm intake valves and 45mm intake ports. There is no way a 3.2L 7000 RPM street engine should be using 53mm intake valves. Nope. That makes no sense at all. With those intake valves you need 1 3/4" headers to match them. Again, that makes no sense at all. All that does is slow down airflow into the engine and destroys low-end to mid-range torque.

[Classic 911]

https://www.motortrend.com/how-to/0507ec-porsche-911-sc-carrera-machine-work/

[Classic 911]

Here from Rennsport Systems:

https://rennsportsystems.com/letstalk/ignitions-cylinder-heads-pistons-cylinders-and-the-bottom-end/

[Robert Espeseth]

Axel, will get some 46's in to AB Garage soon, that will be a better fit for your set-up

[totle]

Originally Posted by Robert Espeseth

Axel, will get some 46's in to AB Garage soon, that will be a better fit for your set-up

Cool and agree