weedburner said

The Ram 300/900 dual friction disc i'm using now was in the car back in 2008/2009 (before nitrous and before the 'tamer) with a different transmission/spline. One side is organic, the other side sintered iron pucks, it also has a damped hub and a marcel carrier. Last winter I swapped hubs so it would fit my Toploader input shaft and put it back in. It was .320" thick when I put it in, after a season with the Hitmaster I haven't had a reason to pull it back out for a status measurement. Well mannered on the street and very easy to modulate, it's getting the job done and is going to stay in for another season.

Before the current DF disc, the car had a Ram full face 5135 iron solid hub/carrier disc. When installed it was .385" thick, at the end of the season it was .370". They are used up at about .270". It still has quite a bit of life left in the friction material, but it's soft narrow hub shows quite a bit of spline wear. Input shaft spline shows no wear. On the street it usually had an annoying squeal on initial take-off and was hard to modulate with my foot, but it handles 2nd gear no-prep launches like a champ.

Before the full face iron it had a Ram 900 series puck style sintered iron disc, it has a damped hub and marcel carrier. In a summer with the 'tamer it went from .320" to .310" thick. On the street it tended to chatter a bit on initial take-off, but moderately easy to modulate.

I used the same Ram 2800lb PP on all three, only hand sanded the pressure ring between discs. I did shim it .060" when I installed the thicker full face disc.

Here's the calculated torque capacities for the 10.375" clutch discs when used with my 2800lb pressure plate...
...organic about 504 ftlbs
...ceramic about 821 ftlbs
...dual friction about 772 ftlbs
...puck iron about 809 ftlbs
...full face iron about 803 ftlbs
If I were going to run my 355 without nitrous, I could likely get by with an organic disc. Spraying another 250 puts it near the calculated limit of the dual friction that's in there now, no problems so far.

Grant

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