951TurboEuroSpec

is there a difference between a 944 crankshaft and a 951 crankshaft..
I have the opportunity to pick up a spare never used 944 rothmans cup crankshaft.
thanks...

jimbo1111

Yes there is. Years ago the N/A cam's were being used as an upgrade in the 951. Don't know if some still do this.

Tom M'Guinn

I believe all the 2.5 street cars had the same crankshaft. Not sure if there was something different about the rothman version however.

Dal Heger

There is no difference in cranks.

Matt Sheppard

I disagree that there is no difference.

The 1983 cranks are about 2mm shorter on the nose since they had no power steering pulley. If you build an engine w/ one of those, you will have to center the pulley by trial and error or build a spacer - guess how I know that.

Chris White

Matts right - the early na cranks are shorter - but will work just fine for nonpower steering cars. Other wise the rest of the crank is identical.

Chris White

jimbo1111

When I looked at this thread I could have sworn it said cam not crank. So my response doesn't apply. Sorry.

Tom M'Guinn

Did not know that. Is it a different part number? Any easy way to identify a short one?

Porsche-O-Phile

I'd opt for an n/a crankshaft if you're picking up one for a rebuild. It will have been subjected to less stress over its years of use than a comparable turbo one.

Oddjob

944 102 015 09 for the early cars, and they now superceed to the later 944 102 015 13 for the n/a's and turbo's.

951TurboEuroSpec

thanks for the help guys. It is a rothmans cup drilled crank still in the box.
944 037 011 22 part number...noticed this part number is different
from the ones listed above

Oddjob

I would be leary of that part number, it does not sound like a valid number. The second set of 3 digits in the porsche part number identifies the major sub system. 100 series indicate the engine, 106 coolant system, 330s and 340s are suspension, etc. Im not even sure a 037 number series exists.

If you look at any of the specific Turbo Cup and Club Sport part numbers, they will just have a different revision/superceeded suffix than the stock part (ie 951 XXX XXX 05, instead of 951 XXX XXX 03)

Also, the Rothman's 944 n/a's were just street cars that the dealerships involved with the series modified for racing. They really were not a factory motorsport version and did not use anything special as far as high performance components.

Even the factory Turbo Cups and Club Sports did not have a different crank shaft. So I would be carefull about paying more for this "Cup" crank than the going rate for a stock crank.

951TurboEuroSpec

The crank it is being sold very cheap.. woops the part number i put down was wrong it is actually
#944 347 011 22 it is a new cross drilled crank...
does this part number match up...

Oddjob

944 347 011 XX is a steering rack part number. Ironically the -22 steering rack I believe is the actual Turbo Cup/Club Sport manual steering rack (I recall the stock racks are -00 for manual and -02 for power).

So the crank is not in the original box. Factory didnt cross drill any cranks, so its had some work done on it. But if the price is right, and you need a crank....

Chris White

Oddly enough – I have an early cross drilled crank too. I bought it from PorscheNA when they moved their HQ. Came in a complete engine (with high comp pistons)…no history or explanation!

Chris White