7.25" (184mm) Sintered Race Clutch Question

[Winston Teague]

Hi all, i seek some info about details of the cerametallic lined solid driven plates as fitted in 7.25" competition type clutches, by Tilton, Helix, AP etc.
I use a Quarter Master plate in my Frazer Nash, i bought a second hand 5 plate NASCAR Clutch complete on US Ebay and scavenged 2 Linings and a driven plate from it as an experiment. The principle is close to being a perfect soloution, but i'd like to try a puck type plate to give more bite at launch. The question concerns the PCD of the (8) rivets that attach the splined hub to the Quarter Master plate. I have made a special Frazer Nash to Quarter Master hub and would like to retain this if poss so do AP, Tilton, Helix etc. have the same pattern of rivets? The PCD i seek is 2.125" x 8, or 54mm x 8.
Any help much appreciated, W

[911hillclimber]

Tony Towson of Super Clutch could be worth contacting, but not sure if they are still trading now.

You could do worse imho asking this question on Uphill Racers forum, a forum of techies involved in hill climbing? You may know them already.

[nj1052]

Many moons ago I wanted to use a paddle clutch in my race Ultima. I had an ex Mangusta ZF box with a very unusual input shaft spline. I had to get 2 hubs made which I then sent to AP who fitted them to the new plates with no issues. I suggest that you ask them if they can do the same for you.

[Winston Teague]

Thanks both, wise words, hadn't thought of sending them the hub! They'll be better at riveting than me too.
W

[jwhillracer]

Hi Winston, just checked a Helix plate in the garage, the rivets on that are 56mm PCD x 8.
Sounds a good shout for AP racing - Anthony Lane in Techcraft, Warwick might be able to help.
Cheers
JW