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Dear Roger,

I can indeed confirm that my 1936 600cc engine with the tungsten balanced crankshaft definitely runs smoother than the 1938 600cc engine which is identical, but without the tungsten slugs.

The acceleration seems to be better, with very little vibration, through the whole rpm range. The 1938 engine is also smoother than the engine on my 1958 Brum Scott, probably because of added weight to the flywheel, which is another of Roger’s improvements to both pre-war engines. Vibration will obviously “steal” a certain amount of energy from any engine, so I believe that the tungsten-balanced engine certainly supplies more torque, and is a definitive improvement.

Kind regards, 😀