I just installed 5.5" 10000 RPM clutch. Stiff as hell. I'm using stock Nissan throwout bearing. Should I be using or doing something different?

If you have an after market clutch pedal assembly, like Tilton or Wilwood, you can change clutch master cyl size to ease the load on the leg. I have also seen some using an anular/hydraulic setup. Search for Tilton on the web, and check that stuff out. Its good but expensive.

Phred

I'm using a tilton master I believe it's 3/4" You would think that would help.

I can't remember which is right. The smaller the dia. the harder the pressure or the opposite.

I had a Formula Ford a number of years ago with a single tilton. I went from a 7/8 to a 3/4 and it was easier on the push. I don't know if they make a 5/8 or not. Call their tech line and see what they suggest.

Phred

A smaller MC will make it easier OR a larger slave cylinder will have the same effect or a combination of the two!. Tilton does make a 5/8". I believe pegasusauotracing.com carries the whole spectrum...

The math is:

MC input force*MC piston area=Slave piston area * Slave output force

Tom

It turns out the master I'm using is 7/8" Way... too big.

It worked fine on the Center Force clutch. The local shop has a 3/4" that I'm going to try. I also learned never put thread lock on that push rod thread. What a pain getting that out.

Thanks for help.

Well. I installed 3/4 Master and it's still too stiff and I'm not taking that pedal assembly apart again :knockedou What's the story on slave cylinder? Does Nissan offer different sizes or is there an aftermarket bolt on? Also anyone know what size the stock one is?