Steve I have copies of all the ledgers that cover the 1939 and 1940 C models and although the handbook quotes the frame numbers prefixed with C11 they are in fact all prefixed C10. I've also calculated that 35 C12's were issued to the Admiralty which is now listed in your latest edition.

The WD C11 crankcase was obviously either modified or re-cast to accept the magdyno. The Timing case was also redesigned to accept the mag pinion which is about twice the size of the original dynamo sprocket. The timing case was then more oval instead of the usual pear shape.

The carb was one of Amal's sideways models.

I have been on the trail of a maydyno C11 engine for about 3 years now (Must be one of the India Office contract unless it's a home-brew?) .....But so far all my leads have ended up a dead end. Ron

email (option): ronpier@talk21.com