Hey fella's, My 1980 310 race car needs a heavier clutch. as you know it has a very unusual clutch set up. I can stack another belleville washer in it and double the pressure on the disc.
Do you think this will create problems with the crankshaft thrust bearing?
Thanks,
Mongo

No more so than fitting a racing clutch cover. It only applies pressure to the crank while youre pushing on the clutch pedal.

rockauto cluch cover $31



Stock Nissan clutch covers:
* A14/A15 - 790 lbs
* A12 twin carb 420KG (926 lbs)
* A12 sports 550KG (1213 lbs)

Thanks for the reply dd. I was thinking the same way. The stock clutch is rated at 728 lbs at full load. The revised clutch would be rated at about 1450 lbs, plus the increase caused by friction between between the springs.
My thought was that for racing use it will be ok, but you don't want to keep the pedal depressed for long periods of time.(when stopped, place car in neutral!)

I would not recommend stacking the clutch springs in the 310. We had built a dune buggy back in the '80s around the 310 drive train. The built A-15 with GX head and Volvo SU carbs needed more clutch. Tried stacking the belleville springs as a quick solution. The only quick thing to happen was the destruction of the center main bearing thrust face.

What was your solution? would a more aggressive disc help? It only seems to slip when shifting. It eventually locks up (3-5 secs)
We ran a 24hr road race with it, and it was about the same at the end as it was when we started.
Hi Gary, we have met several times. Last time was at the ORP track day.

Sounds like you need a new clutch, not necessarily a stiffer one.

Or at least use a thinner washer, keep it to 1000 lbs similar to the Nissan clutches.

Tried a new clutch...no change.
I have searched and called all over for alternate spring but can not locate one. Ideas?
Aggressive disc?

i'd put a washer under each apring, but a thin washer to raise pressure from 728 lbs to 1000 lbs.

It doesn't use springs, It uses a single Belleville Washer.

So it's like most Datsun B210 clutches. Other than having a clutch shop fit a stronger spring, not sure what you can do.


How did your engine turn out otherwise? Does the engine have torque now, or just revs higher?