I have been asked for two sets of the ultimate variant of the Scott high strength crank design. In this case, the crank disc has four holes on the side opposite to the crankpin of about 7/8″ and tapped. Into these screwed slugs of Mallory 1000 90% Tungsten / copper sintered heavy metal are secured. This significantly improves balance, but at a price.
This provision can only be incorporated before hardening, and the initial machining will start soon.
In the very unlikely event that anyone wishes to pursue this option, please contact. The only Scott owner who took advantage of an existing set I had is Carl Stormer. Carl also has a similar spec engine without the tungsten weights. He is the only man who could give an inpartial opinion of the discernible effects of this option.
I very much doubt that anyone will take up this possibility, but it is only fair to ask.
Kind Regards 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.