to cool the cylinder head, but no working model was built.

Production OHV engines

In 1898, bicycle manufacturer Walter Lorenzo Marr in the United States built a motorised tricycle powered by a single-cylinder OHV engine. Marr was hired by Buick (then named Buick Auto-Vim and Power Company) from 1899 to 1902, where the overhead valve engine design was further refined. This engine employed pushrod-actuated rocker arms, which in turn opened poppet valves

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