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-   -   Guidance on cams : 3.2 build - Twin Plug, 10.5, PMOs (http://forums.pelicanparts.com/911-engine-rebuilding-forum/1115905-guidance-cams-3-2-build-twin-plug-10-5-pmos.html)

superninety 03-31-2022 11:24 AM

Guidance on cams : 3.2 build - Twin Plug, 10.5, PMOs
 
Building a 3.2 with twin plug, PMOs and 10.5 CR. Going into my 1970T.

Ive seen guidance on other 3.2 builds but have not yet found such on this particular build.

Running SSI and a Sport Dansk muffler. Have those on hand.

Much appreciated !

pocv0 03-31-2022 12:41 PM

I would contact Dema Elgin or one of the other reputable camshaft grinders like DRC, Web, and give them your specs. They will recommend the proper grind for your application based on your build and intended use ( Track, street rod, occasional auto X ) . I have a similar build with Webers and I went with the Mod S grind from Elgin.

Howard

superninety 03-31-2022 12:55 PM

Yes. Will call Dema for one. He did my 964 cams.

Classic 911 03-31-2022 01:41 PM

The 120/104 cam from WEBCAM is a super profile for a 3.2 build. Real strong and willing all over the powerband.

My 3.2 short stroke has that profile and puts out 290ps and 336,5Nm 254 ft/lbf


Sent from my iPhone using Tapatalk

Jonny042 04-01-2022 04:04 AM

I'd email John at Dougherty Racing Cams. He contributes his knowledge to this forum often.

Guessing he'll steer you towards DC43-102 or DC44-102. You'll probably need to upgrade valve springs.

Good luck!

pkabush 04-04-2022 05:44 PM

Don’t count out William Knight. I’d definitely be in contact if I had a similar build.

Henry Schmidt 04-05-2022 05:00 AM

Quote:

Originally Posted by superninety (Post 11652326)
Building a 3.2 with twin plug, PMOs and 10.5 CR. Going into my 1970T.

Ive seen guidance on other 3.2 builds but have not yet found such on this particular build.

Running SSI and a Sport Dansk muffler. Have those on hand.

Much appreciated !

Two questions:
What is the intended use/purpose of your end product?
What is the minimum octane of the fuel you will use?

At 10.5:1 your dynamic compression becomes critical. Even with twin plug, these engines have the propensity to detonate. If your plan is to run street gas, 10.5:1 is too high for most street friendly cams.
Given the fact that you are using SSIs, your high rpm potential is limited. With the 3.2 short engine, we generally expect the potential horse power to be around 260 @6800. Given those numbers, we like the DC60. It's fun to drive, offers low enough dynamic compression to mitigate detonation (not eliminate the potential) and leaves a little on reserve if you choose to transition to a more appropriate exhaust system.

superninety 04-26-2022 07:00 AM

Henry, thanks for the note.

Street motor. Hill country driving in Texas. 93 octane.

I was not originally thinking Short Stroke but have access to another crank. I wasn't really thinking high rpms. More low end.

What exhaust would you recommend instead of the SSIs, Henry ?


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