02-06-2020, 10:52 PM
I seem to remember Steve Hodgson telling me many years ago that early sports parts were marked with SP prefixes, may be worth asking him as he seemed to be familiar with earlier sports parts.
I suspect it's too early for a 9C (Ulster type) part number, wasn't the Ulster cylinder head 9C1 which due to lack of priming cups and chamber shape couldn't (my thoughts not fact) have been originally fitted on a 23 car, why in this case would you have any other 9C part numbers if you hadn't started. Perhaps you weren't thinking this was a part number Tony?
My reading of it would be S6368, not sure that helps much but I'll add my thoughts anyway.
Just looking at the cards on the archive shows various ratios including 10-54 for the earliest cars, I would post a picture if I knew how but it makes for interesting reading! Pages 15,16 and 17 give various ratios but either 9/44 or all others have 50 or more teeth with 10 or more on the pinion. There is no mention I can see of a 4.4 ratio, was there definitely one produced?
I suspect it's too early for a 9C (Ulster type) part number, wasn't the Ulster cylinder head 9C1 which due to lack of priming cups and chamber shape couldn't (my thoughts not fact) have been originally fitted on a 23 car, why in this case would you have any other 9C part numbers if you hadn't started. Perhaps you weren't thinking this was a part number Tony?
My reading of it would be S6368, not sure that helps much but I'll add my thoughts anyway.
Just looking at the cards on the archive shows various ratios including 10-54 for the earliest cars, I would post a picture if I knew how but it makes for interesting reading! Pages 15,16 and 17 give various ratios but either 9/44 or all others have 50 or more teeth with 10 or more on the pinion. There is no mention I can see of a 4.4 ratio, was there definitely one produced?