Author Topic: Road rocket head  (Read 1446 times)

uglyfrank

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Road rocket head
« on: 24.06. 2010 04:46 »
Hello forum, I am happy to be part of this information forum on behalf of a crusty BSA owner/lover who has no access to cyberspace.
I/we hail from Healesville, Victoria, Australia. We are about 60 Kilometres east of Melbourne. The question is from my friend Taffy John. He has an iron head from a Road Rocket / Super Rocket, that he is trying to establish identification. His question is to do with the size difference of the inlet and outlet valves on the over standard size head. Is there a difinitive answer to this question regarding the size difference to the valves. I thank you, on Taffy's behalf, if there is someone who understands the question and can suppy the answer
Regards, Uglyfrank.

Offline A10Boy

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Re: Road rocket head
« Reply #1 on: 24.06. 2010 09:19 »
Hi
If its an iron head its going to be off a Golden Flash. Rockets had alloy heads.

I dont understand what you mean by "over standard sized" head, but there were two sizes, the first known as "small fin" went on engines upto 1950 [I think]. Then BSA changed design and made the fins bigger, that was the size thru to the end. - maybe you have the large finned one.

The in / ex valves in the Flash were the same size, but the ex valves had a different material on the valves head.
Regards

Andy

1958 Super Rocket
Plus
1974 Kawasaki Z1a
Yam XJR 1300

Offline MG

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Re: Road rocket head
« Reply #2 on: 24.06. 2010 09:33 »
Hello and welcome to the forum!

In case it is a Rocket (alloy) head, lots of information can be found here:

http://atlanticgreen.com/a10alloyhead.htm

Cheers, Markus
1955 A7 Shooting Star
1956 A10 Golden Flash
1961 Matchless G12 CSR

www.histo-tech.at - Restoration, Repairs, Racing

Austria

Offline muskrat

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Re: Road rocket head
« Reply #3 on: 24.06. 2010 11:31 »
G'day Uglyfrank, welcome,
                                          are there any casting numbers on the head ? This will help id it.
Can I call you fugly for short. *smile*
Cheers
'51 A7 plunger, '57 A7SS now A10CR,  '83 CB1100F, 88 FXST .
Australia
Muskys Plunger A7

uglyfrank

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Re: Road rocket head
« Reply #4 on: 25.06. 2010 23:06 »
Hello once again all,
Thank you A10 Boy, MG and Muskrat for the useful communication. I am still feeling my way around this enlightening forum, so please forgive any inadvertent fopars. This head issue will be a steep learning curve for me in regard to the bike and also for Taffy and the computer. All information I will pass to John and we will eventually find the information he needs to continue with this love project. A picture may help in identification (which I will get and post) as well as and stamped numbers that I will provide if the link supplied by you MG draws a blank. So, onward to Taffy and glean more information and then return to add more pieces to this puzzle. I will try to make all things understandable in the level of information so together we solve Johns problem. Thank you once again Gentlemen and yes Muskrat I would be chuffed with fugly. Go Saints !!

uglyfrank

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Re: Road rocket head
« Reply #5 on: 06.07. 2010 10:57 »
Hello forum family,
Taffy and I have done some more investigation about the head from his BSA. Current info is this.... the head is an alloy 650 head.
The serial number stamped on the head is 67-1126 with the letters AM stamped close by. The measurement across the flat of the barrel's width is 26cm. So if this information can help identify the size of the valves that may be being used are bigger than the standard sizethat is comonly used, then that would solve Taffy's dillema. The thought has just occured to me, and this will sound pretty silly, but I suppose if we can get measurement of the valvue in the head at the moment that would go a long way to determining if they are bigger or smaller than the commom size, yes?.
In the meantime; Thank you all for your help so far in this question and we look forward to finding an answer in the near future.

Regards and thanks on behalf of Taffy,
Uglyfrank 

Offline muskrat

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Re: Road rocket head
« Reply #6 on: 06.07. 2010 12:46 »
G'day fugly, *smile*
                               Check out this site http://atlanticgreen.com/a10alloyhead.htm your's is either a '56-'57 Road rocket or '58-'59 Super rocket.
Cheers
'51 A7 plunger, '57 A7SS now A10CR,  '83 CB1100F, 88 FXST .
Australia
Muskys Plunger A7

Offline terryk

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Re: Road rocket head
« Reply #7 on: 07.07. 2010 13:07 »
Here are details of BSA club of Victoria there should be someone near you to have a chat to for advise.
cheers Terry

http://www.bsa.asn.au/html/club/contacts.html
1950-53 A10 rigid/plungers, 1958-61 A10 super rockets, 1947-50 A7 longstrokes, 1949 Star twin,
1951-54 A7 plungers, 1940s M21, WDM20s,
1948-50s B33s rigid/plunger/swingarm, 1948-50s b31s rigid/plunger/swingarm