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A7 & A10 Engine
A7 1946-1950
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Piston Rings
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Topic: Piston Rings (Read 1481 times)
Roadrocket649
Moving Up
Join Date: Nov 2010
Posts: 41
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Piston Rings
«
on:
10.01. 2011 15:06 »
I recently tracked down some hepolite piston rings for my 1958 BSA Super Rocket re-build
The box states
ORIGINAL HEPOLITE RINGS
1950/7 650cc OHV 10 Road Rocket / Golden Flash
70 mm / 2.7559" +060" (I required +060")
R3650 K
However, it has a WARNING printed on the side stating
These Chromium PLated Rings must not be fitted to chromium plated bores
I had been under the impression all barrels are chromium plated, so do I have a problem here?
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bsa-bill
Wise & Enlightened
Join Date: Mar 2006
Posts: 5720
Karma: 66
Re: Piston Rings
«
Reply #1 on:
10.01. 2011 15:48 »
Haven't heard that one. definitely some barrels ( not A10 I don't think) are chromed and some rings also and the way I heard it was two should never meet.
If I remember correctly (not guaranteed) ideally you want a hard and a soft metal rubbing together for less wear
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All the best - Bill
1961 Flash - stock, reliable, steady, fantastic for shopping
1959 Rocket Gold Flash - blinged and tarted up would have seizure if taken to Tesco
MG
Resident Legend
Join Date: Dec 2009
Posts: 949
Karma: 24
Re: Piston Rings
«
Reply #2 on:
10.01. 2011 16:16 »
Hi chaps!
The bores of the A7/A10 engines definitely are NOT chrome plated, it's just good old grey cast iron, bored, honed and that's it.
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
Roadrocket649
Moving Up
Join Date: Nov 2010
Posts: 41
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Re: Piston Rings
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Reply #3 on:
10.01. 2011 18:48 »
Thanks Guys,
I will sleep easily tonight
Roadrocket649
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RichardL
Outside Chicago, IL
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Join Date: Nov 2007
Posts: 6392
Karma: 55
Re: Piston Rings
«
Reply #4 on:
24.12. 2020 20:08 »
Just choosing an old "Piston Rings" topic for this bit of interest.
I bougt these +40 '50-'52 A7 rings a couple of years ago at the large Chief Blackhawk Vintage Motorcycle Swap Meet in Iowa. It was one of those "last item in the last box searched." Probably paid half of what they were worth. Of course my A7 is '57. Funny they didn't think to include " '57" when they made them in '52. Anyway, it's time to use them and I'm a little sad that I have to break into the wax paper packaging and lose this bit of history. Barring anyone here saying "Stop, those are priceless!" that's what I'm going to do.
Richard L.
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muskrat
Global Moderator
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Join Date: Jul 2009
Posts: 10786
Karma: 130
Lithgow NSW Oz
Re: Piston Rings
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Reply #5 on:
25.12. 2020 19:17 »
G'day Richard.
Yes I hate having to open original packing like that but comes a time when the bits are needed.
Keep the wrapping and put the old rings in and hang on the wall (put a groove or two in the rings so they can't be used).
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
flashblack
West Devon, England
A's Good Friend
Join Date: Feb 2009
Posts: 235
Karma: 2
1959 golden flash
Re: Piston Rings
«
Reply #6 on:
26.12. 2020 10:07 »
That's a nice set of wellworthy milemaster rings, some of the best in their day!
My grandfather worked in the machine shop at the lymington factory in the early fifties, and my mum worked in the despatch office, so she probably logged those in the despatch records back then.
I also worked for the firm in the early eighties just before they all closed down. All the factory sites are now all housing or industrial estates
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1959 golden flash
1949 B31 plunger
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The BSA A7-A10 Forum
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Technical (Descriptive Topic Titles - Stay on Topic)
»
A7 & A10 Engine
»
Piston Rings