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rsimps
V4 Guru

United Kingdom
1616 Posts

Posted - 23 Jul 2010 :  07:51:39 Show Profile Reply with Quote
Steve is looking at having a batch of diaphragm clutches made as per the last ones we had done a year or so ago. Would anyone be interested in one? They would require an exchange flywheel.

melle
V4 Guru

United Kingdom
3830 Posts

Posted - 23 Jul 2010 :  10:06:52 Show Profile Reply with Quote
What would be the advantage of a diaphragm clutch over a standard clutch?

1970 Saab 96V4 "The Devil's Own V4"
1974 Saab 95V4
1977 Saab 95V4 van conversion project

Edited by - melle on 23 Jul 2010 10:07:19
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rsimps
V4 Guru

United Kingdom
1616 Posts

Posted - 26 Jul 2010 :  08:02:47 Show Profile Reply with Quote
Its an uprated item, so it will take over 150 bhp. The pedal pressure is also less that a spring type.
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pchristy
V4 Guru

United Kingdom
1790 Posts

Posted - 26 Jul 2010 :  09:10:37 Show Profile Reply with Quote
My car has a diaphragm clutch of unknown origin. I only found out when I changed the gearbox last year!

One of the reasons given for the change is reduced judder, but I still occasionally get a bit of judder on this one. I don't remember judder being a problem on my original car in the early 70s....

--
Pete
"Duct tape is like the Force: It has a light side and a dark side, and it binds the Universe together!"

Edited by - pchristy on 26 Jul 2010 12:45:03
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Morticus
V4 Beginner

United Kingdom
81 Posts

Posted - 26 Jul 2010 :  09:18:02 Show Profile Reply with Quote
Stefan sent me a clutch, not a diaphragm type. This is the text from his email: "I also include a crankshaft spigot bush which must be replaced to avoid clutch judder problems".

This clutch is now in my car, with the spigot bush in place, and there is no sign of judder.
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rsimps
V4 Guru

United Kingdom
1616 Posts

Posted - 26 Jul 2010 :  12:20:36 Show Profile Reply with Quote
There is no reason that the diaphragm clutch is better than a std for judder. One reason they tend to be better is that you are starting with a re-faced flywheel. You are also quite right about the spigot bush. I will tell you what I think is the truth rather than a sales pitch. Alot of Saabs suffer from clutch judder, so it was offered by previous parties as a cure, but that was only because you were starting with new parts.
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pchristy
V4 Guru

United Kingdom
1790 Posts

Posted - 26 Jul 2010 :  12:49:05 Show Profile Reply with Quote
quote:
Originally posted by rsimps
There is no reason that the diaphragm clutch is better than a std for judder. One reason they tend to be better is that you are starting with a re-faced flywheel. You are also quite right about the spigot bush. I will tell you what I think is the truth rather than a sales pitch. Alot of Saabs suffer from clutch judder, so it was offered by previous parties as a cure, but that was only because you were starting with new parts.



That sounds right to me! I never could understand why changing to a diaphragm would solve a judder problem, unless the coil springs on the original cover were horribly mis-matched! I don't recall judder ever being a particular problem when the cars were "current".

The only downside (in my case) to the diaphragm mod is that I've no idea where the original parts came from! When it comes time to change it, eventually, I'm going to have fun and games identifying the bits!

--
Pete
"Duct tape is like the Force: It has a light side and a dark side, and it binds the Universe together!"
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transit80
V4 Mad

United Kingdom
775 Posts

Posted - 26 Jul 2010 :  21:20:14 Show Profile Reply with Quote
How much would they sell for??

Chris
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rsimps
V4 Guru

United Kingdom
1616 Posts

Posted - 27 Jul 2010 :  07:46:33 Show Profile Reply with Quote
Steve at Malbrads now has all the info on what was the Highgate item, you are best contacting him as I dont know what the costs will be now. I just dont have the time to do them anymore, so I just gave Steve the info and contacts. I will obviously help Steve with info etc to make sure they are correct.
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pchristy
V4 Guru

United Kingdom
1790 Posts

Posted - 27 Jul 2010 :  08:58:06 Show Profile Reply with Quote
Do you have any pics of these bits - specifically the release bearing?

When I changed my gearbox, I wanted to change the release bearing as, although it was OK, I've felt better ones! However, as it was a non-standard item, I didn't have any means of identifying it, so the old one had to go back in (time constraints!). Since my car came with a Highgate exhaust, the chances are that the clutch came from the same source, but I'd like to positively identify it!

--
Pete
"Duct tape is like the Force: It has a light side and a dark side, and it binds the Universe together!"
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rsimps
V4 Guru

United Kingdom
1616 Posts

Posted - 27 Jul 2010 :  12:09:13 Show Profile Reply with Quote
The early version I think used a std brg with a built up ring on the clutch cover fingers. The later one has a spacer which is a tight fit and loctited into the bearing and the cover has no ring. Again Steve should be able to find out which one you need, I believe they only did two versions.
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pchristy
V4 Guru

United Kingdom
1790 Posts

Posted - 27 Jul 2010 :  19:31:04 Show Profile Reply with Quote
Hm! Neither of those sounds like mine! I did have a good standard bearing, but it was nothing like the one fitted, which appears to have a raised central section that slots into the centre of the diaphragm.

--
Pete
"Duct tape is like the Force: It has a light side and a dark side, and it binds the Universe together!"
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rsimps
V4 Guru

United Kingdom
1616 Posts

Posted - 28 Jul 2010 :  12:28:00 Show Profile Reply with Quote
The early one might have been like yours, its a while since I played around with an early version. I am sure there where some photo's posted on here of an early clutch.
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