Re: Counter balanced crank
I can't see how one could discern from the way a motor is running as to whether it has a counterweighted crank or not?
Usually one lightens the flywheel when installing a counterweighted flywheel to counteract the extra weight of the crankshaft.
As for affecting the idle? it all depends upon tuning, and even with twin Strombergs, I can get my motor to idle smoothly at 200rpm. Recently at a club event, one of the competitions was to see how long it would take to explode a rubber glove connected to the exhaust pipe. Ours took the longest (with 7:1 compression as well) indicating that it was idling slower than all the standard Model As.
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