Heavy clutch?

[gdr]

I changed the clutch master cylinder from the 0.75" item supplied by Ultima to 0.625" ID. Main reason was that with my setup, the 0.75" cylinder could over extend the clutch such that there was interference somewhere in the bellhousing between rotating bit and non-rotating bit. Result is a lighter (69% of original in theory) and more progressive clutch action where full pedal depression does not produce worrying noise. Only downside is that wife can now drive car. I have the standard clutch and this might not work for all setups, but may be worth considering for any other softies out there.

[davefiddes]

Sounds like a good fix. What gearbox/flywheel combo are you using?

As an aside I don't suppose anyone knows what the thread on the Porsche clutch slave cylinder is? I had to buy a new slave cylinder as my gearbox didn't come with one and I need the adapter to hook it onto the clutch pipe. As far as I can see it is 1/4" NPTF which just seems a little odd for a German part...?

[gdr]

I'm using a 964 box (1991) G50-03 and standard clutch/ flywheel as supplied by Ultima. Made the mistake of buying the starter motor with the g/box - it won't fit as it is a long nosed item for use with the dual mass Porsche flywheel. Anyway, I got a gear reduction starter from Ultima which is very good value. I also had problems locating the slave adapter fitting, and eventually got one from Ultima - don't think it is NPT, some sort of oddball metric. Factory had one in stock, probably common little extra and only a few quid.

[YIIHAA]

Seems to be a common problem. The release arm contacts the bolts securing the clutch when at full extension. Mine did this through the SVA and passed. I was told by the factory that this was quite common, and what I should have done was grind down the securing bolt heads to provide more clearance. By this time I was bored of removing the gearbox, so I let the factory do it for me.

Now I'm no Arnold Schwartznegger, but I've never found the standard clutch to be overly heavy or tiring in traffic

[GTRCLIVE]

I Have standard Clutch etc from factory, my wife has no problem with it, and it's lighterthan any kit car I have had before. Are you sure that somthing is not binding ?

[gdr]

Don't think there anything binding in my clutch mechanism - works nicely. Possibly different geometry changes weight depending which mounting hole you use for pedal (I'm on middle hole) and pedal angle. That said, Ultima clutch was always lighter than my Cobra replica. Perhaps I have just got too used to modern production cars with light controls.

[GTRCLIVE]

Surgest never buying the Folloing cars then :-

Porsche 911 Turbo 4 Speed
Early 60's Chevrolet Corvettes any Big Blocks,
My GT40 Replica (twice as heavy as ult) Reg ANH126A.

Just ones to Avoid ..
Did 300 miles again in my GTR on Sunday, Brooklands, Battersea Park and Chelsea Cruise, fantastic !!!
911T didn't like the fact he could not pull away from me on the A3, unfortunatly ran out of road (to much traffic) was stuck dehind him, oh well next time..

[gtrclive]

Ah those where the days.....I remember them well

>> Edited by gtrclive on Friday 11th March 21:52

[gtr-gaz]

Feeling nostalgic Clive?

There's a nice CanAm for sale near me if you are interested!

Gary