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Old 04-01-2011, 12:02 AM   #13 (permalink)
fud2468
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I was mistaken. The engine this was done on was a '40s flathead Olds but the article was in the Aug. 1953 issue of Popular Science. Oil pressure was used to drive a piston up and down in the cylinder depending on load to vary compression from 6-1/2 to 1 to 14 to 1.
Ray Mac
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