Go Back  Rennlist - Porsche Discussion Forums > Air/Oil Cooled Technical Discussion Areas > 964 Forum
Reload this Page >

Coming from a 993, what is typical of the 964 clutch engagement point?

Notices
964 Forum
Sponsored By:
Sponsored By:

Coming from a 993, what is typical of the 964 clutch engagement point?

 
Old 05-15-2019, 08:09 PM
  #1  
francisluu
Addict
Rennlist Member
Thread Starter
 
francisluu's Avatar
 
Join Date: Apr 2016
Location: Seattle, WA
Posts: 274
Default Coming from a 993, what is typical of the 964 clutch engagement point?

I've been driving my recently acquired 1990 C4 for the last two weeks and have been loving it. I'm likely due for a refresh and bleed of the clutch system but I noticed that the engagement point is closer to the floor than I was expecting. I've had a 993 for a few years and while the pedal feels is similar (stiff but smooth), the engagement point is towards the top of the pedal rather than the floor. I actually find the 964 easier to drive because of this though I'd love to understand what's typical all things being equal (master and slave are good, system is bled well, clutch is in good condition). Thanks all!
francisluu is offline  
Old 05-15-2019, 08:24 PM
  #2  
francisluu
Addict
Rennlist Member
Thread Starter
 
francisluu's Avatar
 
Join Date: Apr 2016
Location: Seattle, WA
Posts: 274
Default

I figure they'd be similar if not the same.
francisluu is offline  
Old 05-15-2019, 08:46 PM
  #3  
chsu74
Addict
Rennlist Member
 
chsu74's Avatar
 
Join Date: Oct 2006
Location: CT
Posts: 7,761
Default

My 993TT, brothers 993C2 and my new to me 964 C4 have similar clutch engagement points. Clutch wear may cause different engagement points though..
chsu74 is offline  
Old 05-15-2019, 08:54 PM
  #4  
francisluu
Addict
Rennlist Member
Thread Starter
 
francisluu's Avatar
 
Join Date: Apr 2016
Location: Seattle, WA
Posts: 274
Default

Originally Posted by chsu74 View Post
My 993TT, brothers 993C2 and my new to me 964 C4 have similar clutch engagement points. Clutch wear may cause different engagement points though..
My 993 before a new clutch had the engagement point higher than it currently is.

Do all of yours bite towards the top as well?
francisluu is offline  
Old 05-15-2019, 08:57 PM
  #5  
omg516
User
 
Join Date: Aug 2018
Location: Bay Area
Posts: 10
Default

I recently replaced my clutch pedal roll pin and it noticeably changed the engagement point of my clutch. Before I changed it, the clutch would begin to engage very close to the floor. After the replacement I would say the engagement point is closer to the mid-point of the clutch pedal travel. You might want to check the condition of your roll pin, from my understanding it's a common point of failure in the 964, mine was pretty much broken in half.
omg516 is offline  
Old 05-16-2019, 08:42 AM
  #6  
Gus
Addict
Rennlist Member
 
Gus's Avatar
 
Join Date: Jul 2003
Location: Peachtree City, Ga
Posts: 1,746
Default Different Clutchs

Over the last 5 years I have gone through 5 clutch’s. Know this is not normal and I don’t ride the clutch. Some had less than 2-3000 miles on them.
The pedal release point has started high and gradually moved to the floor. In some cases, once warm, failing to completely release. When full depressed and in gear the car would creep forward.
First couple of times I’ll put down to normal wear failure. But last 3 have been strange. I have run different pressure plates looking for an answer. After engine mods went to a GT3 clutch only to have three rivets fail as the clutch release point moved to the floor. Latest issue has me really baffled as the pedal started high but moved to the floor, finally not fully releasing. Reason the pressure plate face has warped out of a smooth flat finished. The face was higher on the put side and lower on the inside. So much so the the disk was warn to match. The outside of the disk was very thin while the inside area was much thicker. Am taking pressure plate in to work and let the Porsche professional mechanics take a look and see what they say.
I now trying a 993 Turbo clutch system and have replaced the black slave hose with a stainless line. Also have replaced all between pedal and clutch. New master to slave as well as rod and throw. Will see what happens.
Right now my pedal is back at the very top, and this feels very strange as it is so high.
Any way will up date as/if clutch pedal position changes.
Gus is offline  
Old 05-16-2019, 09:06 AM
  #7  
Marine Blue
Addict
Rennlist Member
 
Marine Blue's Avatar
 
Join Date: Jul 2004
Location: Temecula, CA
Posts: 14,012
Default

Mine engages midpoint, clutch was replaced about 8k miles ago. I’ve driven a 993 that had a high clutch engagement, it was on its original clutch with 48k miles. I also drove a 30k mile 964 and it also had a midpoint clutch engagement.

Having driven several other Porsches, most have a midpoint engagement.
Marine Blue is offline  
Old 05-16-2019, 09:44 AM
  #8  
RallyeChris
Addict
Rennlist Member
 
RallyeChris's Avatar
 
Join Date: Oct 2014
Location: Northport, NY
Posts: 660
Default

My 91 C2 has a RS flywheel and GT3 clutch. Replaced about 15k ago. Bite-point is middle-to-top. That had changed to close to the floor for a time, diagnosed as failing roll pin. Pulled pedal assembly and replaced roll pin. Back to the middle-to-top again.
RallyeChris is offline  
Old 05-16-2019, 12:46 PM
  #9  
chsu74
Addict
Rennlist Member
 
chsu74's Avatar
 
Join Date: Oct 2006
Location: CT
Posts: 7,761
Default

Originally Posted by francisluu
My 993 before a new clutch had the engagement point higher than it currently is.

Do all of yours bite towards the top as well?
All mine bite around 6/10 to 7/10 up. Just after midpoint.
chsu74 is offline  
Old 05-16-2019, 05:06 PM
  #10  
francisluu
Addict
Rennlist Member
Thread Starter
 
francisluu's Avatar
 
Join Date: Apr 2016
Location: Seattle, WA
Posts: 274
Default

Thanks for all of the anecdotal data — time to investigate
francisluu is offline  
 


Thread Tools
Search this Thread

Contact Us - About Us - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: