Now retired I have found the time to drag my 1951/52 Ariel VCH racebike out from under my house and start to rebuild it.
I last ran it in a classic race at Bathurst about 43 years ago and after a 108 MPH run through the speed traps on Conrod straight in the first lap it was running on song till the second lap going up the mountain I lost all compression. Looking down at the Amal GP carby I saw a whole heap of frost and ice. (it was a warm day 30C at the time but running on Shell A with big main jets??)
Back in the pits I removed the head and it wasn't a pretty sight (I think my piston had a religious experience. It was now Holy. My mates said "Pissed an Broke"!) I was so upset about it I put it away and didn't look at it again until now.
I was told by a few ex Ariel racers it was one of the few that came out to Australia, the engine serial number is TR117 which puts it as 1952 but the frame is a SA (1951 plunger).
I have a spare piston and I am accumulating parts at present to get it back together. (a slow process from Australia)
I will attempt to attached some photos.