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The BSA A7-A10 Forum
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Thick flange barrels for A7
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Topic: Thick flange barrels for A7 (Read 1215 times)
steverat
Guest
Thick flange barrels for A7
«
on:
24.07. 2011 18:19 »
Good evening all.
I am considering the purchase of a mid-fifties A7 which has thin flange barrels.
I have owned several A10s and always understood the thick flange to be a safer option.
Was the thick flange ever fitted to A7?
Regards
Steve
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MG
Resident Legend
Join Date: Dec 2009
Posts: 949
Karma: 24
Re: Thick flange barrels for A7
«
Reply #1 on:
24.07. 2011 18:26 »
Hi Steve!
The A7 never had thick flange barrels fitted. There is much more material left in the spigots, around the flange area, because of the smaller bore diameter, hence it wasn't necessary.
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1955 A7 Shooting Star
1956 A10 Golden Flash
1961 Matchless G12 CSR
www.histo-tech.at
- Restoration, Repairs, Racing
Austria
steverat
Guest
Re: Thick flange barrels for A7
«
Reply #2 on:
24.07. 2011 19:42 »
Thanks MG, good to know!
Now I know why my search for 'thick flange A7' on Ebay was a bit fruitless......
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MG
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Join Date: Dec 2009
Posts: 949
Karma: 24
Re: Thick flange barrels for A7
«
Reply #3 on:
24.07. 2011 20:20 »
If you ever find one, then you should buy it right away, because most likely it came off a Daytona Shooting Star competition bike.
They seem to have had special castings for those, 3/4 years before the A10 thick flange barrels were made. Note the very substantial flange (must be more than 1/2"), and 6 smaller fins, instead of 7 on the normal A7. Maybe they modified a mould for plunger barrels. ???? ???? ????
Useless info of the day
Cheers, Markus
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1955 A7 Shooting Star
1956 A10 Golden Flash
1961 Matchless G12 CSR
www.histo-tech.at
- Restoration, Repairs, Racing
Austria
muskrat
Global Moderator
Wise & Enlightened
Join Date: Jul 2009
Posts: 10779
Karma: 130
Lithgow NSW Oz
Re: Thick flange barrels for A7
«
Reply #4 on:
25.07. 2011 01:04 »
Your a wealth of knowledge MG. I wish I had those barrels when racing the SS, the thin flange gave way 3 times for me.
Cheers
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'51 A7 plunger, '57 A7SS racer now a A10CR, '78 XT500, '83 CB1100F, 88 HD FXST, 2000 CBR929RR ex Honda Australia Superbike .
Australia
Muskys Plunger A7
A10Boy
Wise & Enlightened
Join Date: Jun 2008
Posts: 1078
Karma: 11
Solihull, Near Birmingham England.
Re: Thick flange barrels for A7
«
Reply #5 on:
28.07. 2011 09:27 »
Musky, you should have tried through bolting.....................
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Regards
Andy
1958 Super Rocket
Plus
Harley Super Glide Custom
Yam XJR 1300
muskrat
Global Moderator
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Join Date: Jul 2009
Posts: 10779
Karma: 130
Lithgow NSW Oz
Re: Thick flange barrels for A7
«
Reply #6 on:
28.07. 2011 10:16 »
Still do, even thick flange.
Cheers
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'51 A7 plunger, '57 A7SS racer now a A10CR, '78 XT500, '83 CB1100F, 88 HD FXST, 2000 CBR929RR ex Honda Australia Superbike .
Australia
Muskys Plunger A7
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The BSA A7-A10 Forum
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Technical (Descriptive Topic Titles - Stay on Topic)
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A7 & A10 Engine
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Thick flange barrels for A7