944Hybrids: 924/944/968 and 928 V8 Conversions
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HOW TO DO AN ADVANCED SEARCH.

Mon Jul 08, 2013 3:56 pm by Admin


For the benefit of 944Hybrids users there are two search functions available for you to use.
The purpose of this sticky is to explain the "Advanced Search" function because it is much more powerful and is the best choice when researching information.

When you log on to the site a list of options is shown in a line at the top of the page. One option is labelled "Search", use this option (NOT the search box lower down on the right).

After you click on the upper search option, a drop down box appears. At the bottom of this box is a radio button marked "Advanced …

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Clutch wont disengage! Empty Clutch wont disengage!

Post  cannedheat321 on Mon Jul 13, 2020 2:25 pm

I was wondering if anyone has run into what I am currently dealing with.I Have a 1983 944 with the old school RH bell housing that uses the Porsche clutch master cylinder and a Corvett clutch slave cylinder.Everything assembled ok but the first time I bled the system and pushed the clutch pedal down clutch pressure plate spring would not disengage.I am using a SPC pressure plate for a 1983-1992 Camaro IROC.I actually bent the area around the clutch master cylinder and now have to do some weld repair and patch plate around the area where it is mounted.I cant believe the hydraulic pressure is not enough to disengage this pressure plate.The clutch fork begins to move but as soon as the TO bearing contacts the springs stops dead!I built a fixture to test the master and slave for piston movement and that seems fine pistons move full stroke and return.Has anyone ran into this problem before?

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Post  Hotrodz of Dallas on Wed Jul 15, 2020 8:48 am

Stock Porsche master cylinder won't work. You have to use a bigger one. Kent at TPC has the correct master cylinder in stock.
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Post  cannedheat321 on Wed Jul 15, 2020 1:17 pm

Thanks for the response.This partial kit was found on Ebay and a Porsche 944 clutch master cylinder was included with an adapted section of brake line and flex hose attached so I just concluded it was part of the kit.So the Porsche cylinder doesnt have the stroke/pressure to operate the Corvette slave properly.That makes sense! I wonder how the previous owner of the kit made out with this combo?Thanks a lot for the info!

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Post  Hotrodz of Dallas on Wed Jul 15, 2020 1:19 pm

May be why the kit was for sale. He couldn't make it work. LOL

I'm always glad to help
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Post  gwistrup on Sat Aug 01, 2020 6:00 pm

Maybe the flex in your firewall is preventing the clutch from disengaging. I have the TPC kit for the clutch in my car and I have no problem with it. The kit came with a Corvette slave cylinder and a Porsche 944 master cylinder. The clutch disengagement is a little closer to the floor than I prefer but I got used to it. Another thing you will find is that all these cars are different. What might work on one car might not work on an other. Gil

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Post  v8carreragts on Sat Aug 01, 2020 6:37 pm

I don't know if this would be of any help but I have a stock 944 clutch master cylinder and i am using a McLeod hydraulic T/O bearing and it works perfect. The 944 master is the size that McLeod recommends for their hydraulic T/O bearing.
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Post  948 on Mon Aug 03, 2020 9:49 pm

For the LT engines, GEN 2, the the stock 944 clutch MC has plenty of volume to move the 84-88 Corvette clutch SC..

Assuming your pivot point is set correctly,  RH would have set this originally, and you have the correct components, my first guess is that you have not bled the SC correctly.
My second, would be that either the MC or SC is bad.

The best way bleed this is to have the SC higher than the MC. Make sure to overfill the reservoir as it pulls from the top and can suck air quite quickly.

I just replaced my SC a few weeks ago, 5 minutes.
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Post  944s LS6 on Wed Aug 12, 2020 4:54 pm

I had the same problem, My 1st clutch kit was bought from Renegade, after talking with Bob at Hotrodz of Dallas , My clutch was the wrong size from Renegade. I ordered the correct Clutch assembly from TPC ..Fixed the problem
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Post  RobotMachines on Sun Aug 23, 2020 11:32 pm

I have a 1983 944 and put a 1994 LT1 in it. Used the RH kit.

You need to get the air out of the system. It's not easy. get all the air out and your clutch will work fine from what I recall from MANY years ago. Did the conversion back in about 2003.
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Post  RobotMachines on Sun Sep 06, 2020 2:06 pm

I just remembered what I did to get all of the air out of the slave cylinder for the clutch. I had wiggled it up between the engine and firewall to above the reservoir in order to pump the air out, then lowered it back down to install it. That did the trick.
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Post  cannedheat321 on Sat Sep 12, 2020 9:51 pm

I want to thank the people of this forum for their responses.! For some reason I have not been getting the responses to my email address.The clutch fork somehow got off center with its pivot ball and was causing the hang up. I was able to pull the fork toward the left of the car and center it.I also made the clutch slave cylinder rod longer and added a Wilwood 1 inch clutch master cylinder.Stroke at the slave is now dead on!I test drove the machine and found the brakes are junk! Ill be up grading to either ford mustang hydro boost or BMW hydro.That much power and acceleration left untamed is a sure ticket to a crash! Thanks once again for the responses!

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Post  RobotMachines on Sun Sep 13, 2020 10:51 pm

Awesome. Glad you figured it out. For the brakes, just a pointer, use some stainless steel wrapped lines to the slave cylinders. That little bit of extra pressure really helps in the meantime.
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