What is the pressure plate to bellhousing measurement supposed to be on a new clutch install?

 

The important measurement is the RELEASE between the pressure plate and the disc or flywheel and disc.

 

I used this method,and it worked perfect!

From Joey at Tick Performance: (on LS1 Tech)

Does YOUR Clutch Setup need a Shim?
I get a ton of PMs from guys asking if their clutch setups need to be shimmed and when I suggest measuring to be sure, their first response is usually "how?" To be as helpful as I can to everyone, I'm going to try and describe the measurement process. It's tough to do without pictures, but try and follow me here:

During your next clutch install, determine if your slave cylinder needs to be shimmed or not. To do so, you need to take two measurements:

1. Measurement "A" is the distance between the surface of the bellhousing that meets the transmission to the tip of the pressure plate fingers. To get an accurate measurement, the clutch must be torqued properly.
2. Measurement "B" is the distance between the throwout bearing surface to the transmission surface that meets the bellhousing. To get an accurate measurement, the slave spring must be removed and the bearing must be fully seated at the bottom of it's travel; resting on the slave's base.

Once you've got your two measurements, make sure that measurement "B" is ~1/16" to 1/8" LESS than measurement "A". If you come up with more than 1/8", add an appropriately sized shim between the slave and the transmission in order to get the measurements where they need to be.

If there is no difference between the two measurements, or if "B" is greater than "A", there could be a problem with clutch engagement which could result in premature clutch slip and eventually a total failure.

Here at Tick Performance, we're always in pursuit of new ways to get you guys shifting as quickly & efficiently as possible. Determining if your setup needs a shim or not is quick, easy and cheap way to ensure proper function and long life out of your next clutch.

Good luck guys!
__________________
Joey Anderson
Tick Performance of Mooresville, NC
(704)660-5843

To answer the OP's question,There is no set dimension/measurement-it varies,depending on which clutch you choose to install,and you won't know what the dimension is(exactly) till you get there.

 

THANK YOU for that most valuable information!!!!!!

BC

 

O.k. guys I get 2 1/4 on measurement A and 3 1/4 on measurement B. That is over an inch and there is no way to correct it because B is greater than A. WTF?

Clutch is a Spec 3I and it is torqued properly.

 

Can you take a picture of the EXACT points that your using as your reference measurements. You will most likely need an assistant to snap the photos. That way some one who has successfully accomplished this procedure can say Yea, your doing it correctly OR NO, you need to do this to measure it correctly.

That measurement is extreme so your most likely not using the correct measurement points or the slave is not fully compressed.

I have yet to do the measurement and need to so, YES, this is very interesting to me also.

BC

 

I am measuring correctly. Not my first rodeo with clutches.

Yes the spring was taken out and the throw out bearing with cup was bottomed out.

Yes the pressure plate is installed with clutch in the car and torqued properly.

Spec's are famous for wearing out extremely quickly and this might be the cause. If I installed it as is then the throw out would be riding the clutch fingers not allow for full disengagement = constantly slipping clutch.

Probably just going to buy a RXT twin and be done with it. Spec has a bad reputation anyways.

 

This is the thread Carcass talking about when joey at Tickshift posted at Ls1tech: This thread has 2 figures representing Measure A and B:

http://www.ls1tech.com/forums/manual...need-shim.html

 

O.k. Spring cup wasn't pushed on all the way after removing the spring. Measuring right just not setup correctly....LOL.

A is 2 1/4 and B is 2 3/16 so I am within an 1/8th.

BEEN A LONG DAY FOR SURE...TIME TO GO TO BED.....

 

Another good thread for reference.

http://www.ls1tech.com/forums/manual...good-tech.html

 

2 3/16(B) is one 16th less than 2 1/4(A),so it sounds like you're where you need to be.
Or am I missing something here?

 

No you are right and I am tired. Got the tube and rear end in tonight. Just tough working on this stuff by yourself and on your back. Nobody to smack you upside the head......

 

Would be glad to lend a hand if I weren't in Texas.