You can not alter the force on a diaphragm PP. You can on a coil spring PP. If someone can, then please post the proof.

 

What makes you think you cant alter the clamping force?

 

I disected a Valeo PP and found that the fulcrum pivot points are cast into the heavy surface of the PP. IMHO you would have to completely recast this piece with the pivot points moved to a different spot. Moving the pivot points is how you do it in a coil spring type PP. The diaphramg springs are all the same. My clutch maker also confirmed this.

Unless there is another way.....

 

Post up some pics of that, I'd like to see.

 

No can do. Threw the parts out when I recently cleaned out the attic. Find an old busted plates and drill the rivots out and you will clearly see what I mean.

 

I might have to do that. I should have an old one sitting around somewhere. If I ever get around to it I'll try to remember to post up some pics.

 

Just thought I would say my ram powergrip HD pressure plate doesn't say valeo anywhere on it. Not sure how it compares to the valeo but it looks just like any other LT4 pressure plate that I have seen. It has also been completely deburred and it has also been balanced.



And a few other pictures of the powergrip HD for this thread. The mcleod single disk I'm running wont hold launches on nittos with my power level so I'm swapping it out.

 

Is it possible to pull out the spring and put in a stronger one?

 

Wanted to point out that the aluminum flywheels have steel inserts for the contact surface, bolted to the flywheel. The steel insert replacement for my Al Spec flywheel was $70 from LMPerformance, but no one lists the insert replacements on their website so you have to call.
Can you get just the pressure plate from any of the parts stores? Autozone doesn't list it separately. I got a new spec 3+ and pressure plate for $620 from LMPerformance, but if the pp's are really all the same and they're $150 cheaper from O'Reilly's or somewhere, I might see about sending the pp back.
Also by the way, you can't use the Spec flywheel (or probably any other flywheel except McLeod's) with the McLeod Street Twin.

 

Thanks for this post. The question now is whether what Spec said is true. Most of the information and opinions on this thread indicate that it isn't. I just looked at a Centerforce pp and it looks like to me like to modify any pp of this type, someone would have to do a decent amount of work, including drilling rivets out putting in a new diaphram spring, then re-rivetting the plates back together. I don't know. But on the other hand, to be specifying your units up to 800 ft-lbs, and then using a pp that's designed for 300 doesn't make much sense. I don't know if I can see just changing the disc material to up the holding force (friction) by 100%. (That is the only principle clutches work on; friction coefficient times force on the object, like anything else.) It seems like it would be easier to strengthen the spring.

 

Heres some pictures of the mcleod single disk that is so popular. You'll find out why I'm not a fan of duel friction clutches in the pictures. This clutch had < 30k miles on it too.

 

I was told by my local clutch maker the springs are all roughly the same spec. Obviously there are two of them out there, the ribbed and NON ribbed. I have not seen the NON ribbed except in GM LT1 PP's. He told me that by and large, there is little you can do to strengthen the diaphragm PP unless you recast the piece to relocate the pivot points.

 

what disk would be best to buy with 350 rwtq? not looking to get any more than 350 wheel with this motor so anything that could handle that would be great. possible track time with some slicks so i woiuld like something to handle a dump pretty much to.. would a spec 2+ be fine for that?? and if so could i just get any replacement PP from autozone and just resurface the stock flywheel??

Jeremy

 

These are the numbers I'm getting off my Valeo Clutch kit pressure plate. This is not some other sellers kit, like AutoZone, but the Valeo kit. Do these numbers look right? I'm trying make sure I didn't get the wrong PP. The PP does have Valeo stamped on it.

382109-D0
187384 or maybe 167384.

These numbers look familiar?

My clutch guy says there number for the kit is K0082 HD. Any famliarity with that kit number.

Car is 95 Z28 M6

 

I saw the Carquest clutch today, it is made by LUK. The PP had a smooth, dark color casing and did NOT say valeo. It looked decent overall, and the disk (not the friction material) was definitely more buff compared to OE.