For which bike are these cylinders?

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pkrpkr
Posts: 10
Joined: Sat Jun 25, 2016 10:58 am

For which bike are these cylinders?

Post by pkrpkr »

Can anyone help identifying two sidevalve cylinders I have found? The piston diameter is approx. 70mm so I presume about 500-600cc on a twin.

Thanks,
Peter
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Darryl.Richman
Posts: 2087
Joined: Fri Oct 27, 2006 3:00 am

Re: For which bike are these cylinders?

Post by Darryl.Richman »

Because of the 6 crankcase mounting bolt holes and the shape of the cutout over the valve area, these are for the side valves in the models from 1937-1942. That includes the R71, R61 and R6. But only the R6 https://vintagebmw.org/model-lookup/?shownode=6337 and R61 https://vintagebmw.org/model-lookup/?shownode=6999 have 700mm bore pistons.
--Darryl Richman

pkrpkr
Posts: 10
Joined: Sat Jun 25, 2016 10:58 am

Re: For which bike are these cylinders?

Post by pkrpkr »

Thanks Darryl!

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