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Had to dash off to a meeting. Finishing the thought...
Carburetors are still made and being refined for old engine applications. Fixed timing single cam engines like the metro, vw, ford 2.3, etc are still around just like the old V-8's and will continue to be around for some time. Because a sophisticated modern VVT retrofit is not really an option, this centrifugal cam advance idea seems like a solid incremental improvement for the older engine designs.
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