911 engine case Revisions

[gled49]

Again, post #13 Alu die cast 80mm stud spacing 901 xxx xxx 7R. Post #14 Alu sand cast 83mm stud spacing 911 xxx xxx 0R. I built the engine in post 13 so I'm pretty sure about dimensions. And yes sand cast case came in 3.0 RS and 3.0 RSR's.

[blue72s]

Yes, apparently Porsche used both types of aluminium cases for the last few 2.7 RS's - die cast (7R) and sand cast (0R). Which one was Silumin?

[gled49]

The 2.7 was the Silumin crankcase. May of 73. I believe that chassis 1387 in light ivory was the car to homologate the crankcase. It was a car here in Portland for a long time.

[draab29]

I recently purchased a 1969T with a 3.2 short stroke motor. I had some free time today to look deeper into the case numbers. My case number is 911.101.104.4R. I suspect it is an early turbo case referencing the numbers listed in this thread. It looks like the 4R was re-stamped. Is there any significance to this? Sorry the pic is upside down

[VZ935]

Here is one I have

[davep]

Thanks Van. I know little about the 934/935/936/956/962 variants yet. Perhaps you may be willing to assist me with those?

[rliberty]

Guys...you all seem to know a significant amount about engine case numbers and how they relate to which car.

I have the following...

901.101.102.7R
6459087

&

901.101.102.7R
6461268

Amy help identifying these would be awesome...

Thanks!

[Paul k911]

Hi all,

I just stumble upon this tread while i am searching for answers of my newly purchased old engine

Case number 901.101.101.0R & 901.101.102.0R
Engine number 4080424

I am guessing its a 1968 2.0 with an aluminium case?

Have a nice weekend.

Paul

[Elferhelfer]

Interesting post,...

Does anybody know the aluminum alloy of the early engine case?