Engine Balancing Basics - Need help

[andy669]

IMO, where the weight is placed is not as important as the overall weight. I want my rotating assembly as light as possible. If you were to take for instance, a 1 pound weight off of your flywheel that is approximately 5 inches from the crankshaft centerline, it might take a 2 or 3 pound piece of mallory to make up the difference in the counterweight of the crank, which is only 2 inches from the centerline.

If I was building a 10,000 rpm motor I would opt for internal balancing. The bearings in a motor of this type wouldnt have much of a life expectancy if it were externally balanced. The machine shop that I deal with tells me that internal balancing 'is a little easier on parts', thats all.

Andy