The Bridgestone 2-stroke 350cc twin of the late 60s or early 70s used
chrome plated aluminum cylinders made of the same alloy as the pistons
so that both would expand at the same rate, to avoid seizing.
So direct chrome plating of aluminum is pretty old tech.
In that long ago time, it was the second fastest accelerating production
bike after teh Norton 750cc twin. Handled really well too. The pocket
rocket of its day
Moose
Winsor Crosby wrote:
Chrome plating aluminum directly is already an old process. Porsche
was doing it on the 946 model and I think GM used it on the unlamented
Chevrolet Vega before that(not a high performance engine. :-)) GM did
it to save money in not using iron cylinder liners. Porsche did it for
superior heat transfer in the block. In some cases the process has
been superceded by silicone treatments(not plating) that make the
surface of the aluminum harder than the chrome that was used earlier.
Metallurgy seems to be continuing to evolve.
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