Difference between Turbo and Carrera crankshaft

[Dennis Kalma]

Been doing my research finding (amongst other things) a crankshaft for my brand new engine case (no serial number even).

As I bought the case privately, and the buyer did not have the part numbers, I am not sure if it is a Turbo case or a Carrera case....in any event, I know it is post-'84 (no sump plate) and brand spanking new.

I suspect the case is the same for both the Turbo and the Carrera, but the crankshafts show different part numbers, and I cannot find anything which identifies the difference.

Anyone out there have a clue about this?

Dennis

[beepbeep]

I think that only difference is shape of gear that turns ignition dizzy. Might be wrong though.

[MBEngineering]

HI check the oilers for the pistons, the turbo ones are the larger hole, you will have to compair with a SC case.

regards mike

[Dennis Kalma]

I will check when I get my core SC engine taken apart, but then again, the larger oilers ought to be a good thing for a high performance (for the street) 3.4 liter engine?

I checked with the list a while back, the case came with a Carrera pump, I assume the larger squirters wouldn't force an upgrade to the Turbo or 964 pump...and come to think of it, given that they were purchased as a set, the oil pump (Carrera) ought to be a match to a Carrera case.....given that Porsche parts did their thing correctly when it was all ordered.

Dennis

[adomakin]

goran is right on the dizzy drive gear. thats the only difference between the cranks.

[89turbocabmike]

Originally posted by Dennis Kalma

I suspect the case is the same for both the Turbo and the Carrera, but the crankshafts show different part numbers, and I cannot find anything which identifies the difference.


Dennis

beepbeep got it.

On the case the other difference between the turbo and carrera is the turbo came with dilavars on the exhaust side.

[Dennis Kalma]

Hmm..maybe I have a Turbo case then, it definitely has steel studs on one half and dilavar on the other....Turbocab, I assume you are positive about the difference....or does it fall within the vagaries of Porsche manufacturing/ordering and general Porsche wierdness....

Dennis

[89turbocabmike]

No, I'm sorry Dennis I'm wrong.....turbo cases are all dilavar and carrera are half/half. You have a carrera case. Here's the pertinent thread.....I'm just getting old

3.2 3.3 case differences?

[Dennis Kalma]

Ok, been doing more research, poring over various books and think I may have it.

The cases are all the same, but the Turbo crankshaft is different than the normally aspirated one...according to Frere, both engines had their main bearings increased from 57mm to 60 mm, with the Turbo getting a bigger #8 bearing (31mm to 40 mm), the normally aspirated sticking with the 31 mm version.

Rods are different, the Turbo's being narrowed 2mm (to 21.8mm), but increased in diameter to 55mm. The normally aspirated engine's rods were narrowed to 22.6 mm, with the big rod ends being increased to only 53 mm.

So short answer, cases are interchangable, crankshafts and rods are not. I have absolutely no clue why Porsche made the two crankshafts different, one would have thought they would have been the same since they have the same stroke (74.4mm)

Turbocab, you are also very correct on the use of Dilavar's, so again there is a difference, just the castings are the same...

Dennis

[89turbocabmike]

I am in the market for a crank/rods for a new engine I'm building. I'm puzzled by the rod size differences as in my parts searching, rods are often listed as interchangeable and rod bearing sets are listed as interchangeable between 3.2/3.3 . Even our host shows the same part number for both rods.

[Jeff Alton]

Rods are the same, right up to and including the 964 3.6.

Cheers

[adomakin]

yep, i always thought that the rods were the same

[beepbeep]

If you are building hot-rod 3.2 or 3.3 turbocharged engine and are planning to use distributorless wastefire ignition, dizzy gear differences are not a problem (as there will be no dizzy) and 3.2 case/crank are as good as 930 ones. They are often easier to find too. As far as I know, there shouyldn't be any diferencies on rod diameter sizes.

[len911]

As a point of reference, I have a 3.2l block (930/21) from an '86, using a 930 crank out of a '79 3.3l engine (930 102 014 00) Just checked my rods build sheet from Pauter. Big end diameter is 58mm, width is 21.74. Small end diameter is 22mm, I believe they are 22mm due to my Cosworth pistons pin size. I reused the #8 bearing while building, so don't know size, but had to retrofit the pilot bearing to a '79 style. Using crankfire, so don't have any distributor issues. Lou

[Dennis Kalma]

Well, this must be the case where our inimitable Paul Frere is wrong.....there is a fair writeup in his book describing the differences between the Turbo and Carrera engines, but one cannot argue with actual experience.....just I find it curious that Paul would have gone to such lengths describing the differences and then have it not be the case.

Oh well, just reinforces my view that I have a Carrera case, I need a crankshaft, rods need to match the crank (length if nothing else) and get on with it.....

Dennis

[Eagledriver]

I suspect that the "Carrera" that Paul Frere is talking about is the Carrera 3. That engine had the same crank as the earlier 2.7 engine. This is also the crank that the first 3 litre Turbo had.

-Andy

[Dennis Kalma]

Well, taking the big plunge. I have taken delivery of the Mahle 98 mm, 10.3 compression pistons and cylinders (truly gorgeous parts)....now I am going to trust all you great guys out there and buy a new Turbo crankshaft for my engine.

There is nothing anywhere in Porsche that can either find the differences between the two crankshafts (930 102 014 09 (Carrera) and the 930 102 014 10 (Turbo)), so you guys are the reigning masters I suppose.

Since I am going distributorless, there is no issue with the gear assuming it is the only difference....

The local Porsche dealer has a good price on it, so in celebration of my new job, my wife said ...go for it!

Thanks for all your help guys!

Dennis

[Henry Schmidt]

The major difference between the 3.2 Carrera crank and the 3.3 turbo crank is the dowel pin in the flywheel end of the 3.2 Carrera crank. That dowel pin locates the flywheel more acurately because the Carrera flywheel carries teeth that are used the tell the ECU the speed and tdc for ignition system.