Old 09-01-17, 02:24 AM
  #14  
Zinger
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There was the 18 cylinder air cooled Bristol Centaurus sleeve valve aircraft engine . It used a set of helical gear shafts to turn and reciprocate the steel cylinder sleeves which had the valves cut into their sides.That enabled more valve area than poppet valves were capable of, including those in hemispherical combustion chambers.

It was derived from the earlier simpler Willys-Knight sleeve valve design.



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