The BSA A7-A10 Forum

Technical => A7 & A10 Engine => Topic started by: Yarp on 28.11. 2013 23:42

Title: SR engine prefix
Post by: Yarp on 28.11. 2013 23:42
Hi all,just wondering if anyone has any info on the engine of my 58' Super Rocket. Under the engine number the case is stamped HHC,seems that designates high compression pistons.the engine no matches the old green log book that came with the bike,is that a standard stamping on all Super
 Rockets or maybe a special order or something like that? Martin.
Title: Re: SR engine prefix
Post by: Billybream on 29.11. 2013 07:50
Hi Martin.
HHC stands for high compression, and is correct specification for Super Rocket.
You should hope for DA10 prefix to your engine number, which denotes beefed up bottom end - one piece crank, stronger bearings and thicker barrel flange.
Title: Re: SR engine prefix
Post by: chaterlea25 on 29.11. 2013 11:52
Hi Martin,

 HC = high comp,   plus Spitfire 357 cam = HHC, as far as I know

John
Title: Re: SR engine prefix
Post by: muskrat on 29.11. 2013 11:57
HHC should also have the sports (356) cam.
Cheers
Just saw John's post while I was typing. I thought the 357 didn't appear till '60 for the spitfire and '61 for the SR.
Title: Re: SR engine prefix
Post by: Yarp on 29.11. 2013 17:56
Ok thanks for the info,the engine no is CA 10R and matches the no on the old log book.
Title: Re: SR engine prefix
Post by: PaulC on 29.11. 2013 18:10
My '59 Super Rocket has a CA 10R too, but only "HC".

Paul
Title: Re: SR engine prefix
Post by: 1959superocket on 02.12. 2013 17:56
For a 58 Super Rocket the Engine numbers should be from number CA10R 6001 onwards.

The 59 Super Rocket engine numbers should be CA10R 8193 onwards.

The DA10R engine numbers pre-fix was used from 1960 to 1963  super rocket engines.

HHC or HC is just a reference to high compression and not relevant to numbering.

Hope this helps

Regards

Stuart
Title: Re: SR engine prefix
Post by: Rocket Racer on 04.12. 2013 07:54
as John, aka Chaterley says the extra H stands for high lift cam eg 356/357 depending on the year