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Anyone here know the clamping forces of the 944na and the 944S/S2?

Apparently , all of the other clutch parts are the same. So... maybe the only diff in the two setups is the pressure plate... and, that pressure plate may have a higher clamping force making it a relatively inexpensive upgrade for those cars under heavier use.

Predator

I assume you're talking factory parts here. Somewhere back in my younger days, I think I was told by someone with alot more knowledge than I, that they're the same patrs with different numbers. If I was going to all the trouble to change a clutch, I put the best avilable in there, meaning, IMHO, a Centerforce sprung hub.

Waterguy

The factory specs for the 944 pressure plate is a contact pressure of 1370-1530 pounds. The 951 pp has a contact pressure of 1960-2140 pounds. Of course, they don't give the specs for an S or S2 pressure plate, which is what you are really looking for.

Skip

Thanks for the info - I also think I know that the 968 PP is 2300-2500 (same as early 964) with an optional sport plate from the 965 that is 3100-3300.

Any idea what the Centerforce is rated at?

Danno

Well, from what I've seen, Centerforce claims 80-90% more clamping pressure than stock for their 951 Dual-Friction clutch kit. So using Don's numbers, that would be 3528 to 4066 lbs. My car came with the updated Cup clutch and it ended up lasting 40K-miles. Part of the quick demise in the last 10K was probably due to the Huntley MAF-4/Turbo-2 upgrade I put in which roughly doubled the stock torque. I replaced that with the Centerforce Dual-Friction kit and so far, it's got 80K-miles on it. When I tore the engine apart to rebuild, I measured the clutch disc and it was only 1/2 worn, so I'd have to conclude that the Centerforce clutch will last 4x as long as the Cup clutch on the 951.

Skip

So, what are you saying.. we should start looking at Centerforce clutches?