C: Clutch Not so much tech advice but has anyone ever seen one of these??

[Robert Watson]

In my latest rather large parts collection I have found this clutch drum. It looks just like many I have seen before but is about 1/4 in deeper with the appropriately deeper slots for the disk ears. I'm not sure it would fit under a clutch cover, and what is the purpose??

 

[litnman]

The one on the left is very similar to the one in the Auger Lightning, and it had two
fiber plates.

 

[Robert Watson]

I thought it might be something like that, did it have a steel plate in between them driven on the 9 pins. It came from a collection that has a sidecar racer so maybe was used on that?

 

[Robert Watson]

Plus I found some spring and spring cups that look like Vincent ones only much deeper, just occurred to me they are probably for this.

 

[litnman]

I thought it might be something like that, did it have a steel plate in between them driven on the 9 pins. It came from a collection that has a sidecar racer so maybe was used on that?

Yes an extra steel plate.

 

[timetraveller]

I wonder as to whether this was successful? If the idea was to increase the available torque from the primary clutch then has this ever been shown to be inadequate, I thought the idea was that the primary servoed the main clutch which does all the hard work. Also the 'half holes' were given up by Vincent fairly early on as they proved to be the source of failure. Anyone know whether this was used successfully?