GoRideSno

OMG
Andy K

Old & New

Twin disk is most robust setup for launching, and maybe ultimate torque handling (?) Has softest pedal to boot.

First thing I had to do after upgrade to 8psi, absolute necessity now at 10psi.

Fussy adjustment, but no big deal. Twin disk is not an experiment, it is the solution.

No one offered me a *free* twin disk

Carl Fausett

I too have been thanking Mark for contributing to my wild ideas more than once. It's good business - "go nuts - break stuff - call me" ... I think that's the plan... ;-)

In the first summer with my supercharger on my 78, I went through 4 clutches in as many months racing. I could just torque the **** out of it coming out of a corner, and you could hear the clutch slip on the rollbar-mounted camera!

There were two cures:

1) we found out that the 78/79 pressure plates were the weakest they ever made - (only designed for 220 HP) - so Mark & Co helped me upgrade to a 81 pressure plate and intermediate plate setup which made a BIG difference. The little short splined haft has to be updated with the rest of the parts for this setup, but it was good.

2) Mark A bought a fixer-upper and dropped the clutch out of it to find out why it was so grabby. He called me on the phone to say the thing had a 3-puck metallic clutch in it - would I want them for my race car?!? Hell ya!
I am on my 3rd racing season with those clutch discs and believe me - there is no slipping.

Sorry - there isa no brand name or part number on it at all - I have no idea where it came from.

Here is a picture of it:

Chris Lockhart

Thanks for the update Gretch. As you know, I'm really interested in those numbers!!!!!!

So, you are going to re-line the clutch disc with kevlar based friction material??? That sounds interesting, I hope it helps. Please keep us informed.

I know of one local lister that used a local brake/clutch re-lining company to do his clutch. Cost was certainly cheaper than buying a new clutch, but we'll have to see how long it'll last. If yours works out, it might be a viable alternative to the masses.

SharkSkin

Carl,

Did you have to replace the torque tube to get that in there? I've been told it's a different length.

D

ColinB

Hey Gretch
You're absolutely right in both your items of British culture. For anyone interested in history the two fingered salute is said to have originated at the battle of Hastings in 1066 when the English got a pasting at the hands of the French in the last time that England was invaded. Every English schoolboy knows about The Norman Conquest of 1066.

Anyway, a favourite trick of the Normans (they were known as Normans because France as a nation didn't really exist then) was to cut the first two fingers from the right (bowstring) hand of any English archer they captured and send him back to the English lines to demoralise his remaining fellow archers. In retalliation those as yet uncaptured would jeer and raise their two fingers to show they could still fight!

Sadly you rarely see the archer's salute nowadays. Thanks to Hollywood most English kids have adopted the single-finger American equivalent . In English vernacular the translation is "up yours"!

Colin

Carl Fausett

Sharkskin;

to upgrade to the 81 and later twin disk clutch form the 78/79 clutch (for the higher clamoing force it has) you need to get the 81 and later
pressure plate and stub shaft for sure. I am trying to remember if I also had to use a 81 and later release fork and intermediate plate... I think so but can't remember precisely... (too much time and beer has past by)

the boys at 928 Intl could tell you... they told me.