Author Topic: Piston Rings  (Read 798 times)

Offline Roadrocket649

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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?


Online bsa-bill

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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
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

Offline MG

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

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

Austria

Offline Roadrocket649

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Re: Piston Rings
« Reply #3 on: 10.01. 2011 18:48 »
Thanks Guys,

I will sleep easily tonight

Roadrocket649