Brett Jenkins

What is the going rate for 85/86 cams and is anyone interested in a set? Also, I have 944 forged turbo pistons with custom forged Pauter rods. Am I better off separating the piston tops and rods and selling each set separately? What/where do I need to measure on the rods to provide the precise size to a potential buyer?

GregBBRD

Pistons are 100mm or are they 100.5mm?

For the rods, you need to know both bore diameters (for both ends), width of the big end, width of the pin end, and center to center length between the two bores (which can be calculated, if you know the two bore sizes and the outside to outside dimension of the two bores.

Brett Jenkins

I believe they are 100mm.

By my rough measurements, width at big end is 2 1/8", pin end is 1", outside to outside is 7.5", bore sizes are 2 1/8" and 15/16", so I calculated center to center at 5.96875". I can get more precise whenever I find my digital micrometer.

Is there a market for the rods separately? Seems like it would have to be a pretty specific build, but my engine building knowledge is lacking.

GregBBRD

Brett:

Yes, no doubt that they are specific, but if I can help you nail down what specifically they fit, someone will want them.

My initial thought is that someone put a GTS crankshaft into a 5.0 block and ran a 951 piston (forged, instead of cast) to reduce the compression ratio.
Not a bad way to go!

These rods were on a stock 928 GTS crankshaft or a custom crankshaft?

Brett Jenkins

Part # is 928.103.8R. Speaking with Marcus Hutchinson, who built the motor, I don't recall him saying the crank was anything but stock. He did say was shooting for 8:1 or 8.5 to 1 compression.

GregBBRD

But it was a 6.0 liter, right?

Brett Jenkins

He mentioned "stroker" a few times, but wasn't sure of the size.

GregBBRD

I'm a bit lost.
Not sure of what combination of pieces you have there.
With that length rod and that piston, it sounds like a 5.0 engine.
I guess he might have used the 951 pistons to reduce the compression ratio, only.

Brett Jenkins

I'd be inclined to agree. I could never figure out how he increased displacement with that combination of parts.

Brett Jenkins

I inquired with Pauter about the rods, using Marcus Hutchinson as the contact and got no hits. Reading through Rennlist, I found that Markus Herm at German Auto Art actually built the engine for him. Giving this info to Pauter returned this:

The rods ordered in April 2002 were # 928-240-550-1520C which describes the part as 928 Porsche 24.0 pin 55.0 B.E. and 152.0 c-c length, so most likely a custom length part (+ 2mm over std.)

So, my measurements were close, but a little off.

I remember Marcus telling me he needed the extra 2mm with these Pistons to make them fit how he wanted and that he calculated 8:1 compression with this setup.

Would rods of those specifications be of use to anyone using any other setup? @ $2400 a set new, I hate to waste them, but I am not sure how/where to offer them up.

GregBBRD

Hmmm.
My best guess, until we get one more measurement:
He must have used the 951 pistons to reduce the compression ratio, but with that 951 "turbo" dished piston, the compression got too low.
So he machined 2mm off the top of the piston to reduce the piston volume and then ordered a connecting rod that was 2mm longer.

Measure the distance from the top of the top ring to the top of the piston and I can compare that to a stock 951 piston.