Author Topic: Numbers on front of cases(not eng Nos)  (Read 827 times)

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Offline AdminPete

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Numbers on front of cases(not eng Nos)
« on: November 26, 2008, 05:32:09 pm »
Found these numbers on the front of the crankcases of my C12. between the front engine mounting plates. each half is stamped with 290 ( I guess this may be to match them up) and also on the timing side is 29 1968.  any ideas?

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From: C10_11_12 Sent: 09/11/2006 08:14
I think you are right about the two numbers stamped on front of engine. I allready noticed this on twins. You have the same markings on conrods of twins, being made of 2 parts they need to be matched.
About the marking on the timing side it could be a part number. I had a look at the parts list where I could see 29-1966, 29-1963 & 29-1969 for parts identified as "crankcase cpomlete with fixed fittings. These refer either for a C10L, or C11G/C12 or the whole lot.
The prefix "29" is common for the pre-unit 250 single identifying. If you look at a parts list, parts typical for them begin with 29. I noticed that parts beginning with 29 are also used on other models like the A7/A10, when these parts did not not ask for a special fabrication and it was cheaper to use an allready available part (no extra tooling and so on).

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From: C12Steve Sent: 09/11/2006 13:37
Thanks, that makes sense. numbers are similar although not shown in my Draganfly download like you say .

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From: C10_11_12 Sent: 27/11/2006 08:39
I had a look at the engines sleeping in the garage.
C11 are stamped 29-2318.
C10 are 29-2324.
Does this mean you cannot use a C10 crankcase with C11 internals (crankshaft, ...?)
C11G  & C12 are 29-1968

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From: frank66 Sent: 27/11/2006 17:28
Flywheels are the same. The conrod is different. C11 is approx. 1 inch shorter.Camshaft different and holes for valve followers are in a different position. These would be the main differences. cheers John K.