[Pete]

The answer to the test question is:
At 48 million rpm, the .200 inch diameter steel ball bearing vaporized.
It was levitated in a vacuum in a magnetic field and rotated by an RF signal applied to a fixed stator.

In the case of the standard 3 main model B crankshaft, it had Dan Price full circle press on weights with 3, 1 inch diameter Mallory slugs pressed into each weight and the overall diameter of the crank reduced by 1 inch. After the weights were pressed on they were tig welded all around with ER70 rod.
As much weight as possible was machined off the throw sides of the crank. It was final straightened and the journals were nitrided.
This flathead 4 intake port engine turned 6500 twice a lap for one season of 6 vintage race events.
It was not as smooth vibrationwise as a V8 but was far better than any stock crank model I ever saw.