Old 08-31-17, 07:22 AM
  #6  
skidder
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There was someone back in the late 1970s-early 1980s, I think Australian, who developed a two-stroke engine with valves driven directly by linkage from the engine's driveshaft. It improved the efficiency of the two stoke engines, had fewer parts than a standard four-stroke valved engine, and reduced exhaust pollution, but it required more major maintenance (the valves tended to 'gunk-up' more often which reduced their ability to seal properly), so it never really caught on. I tried searching the web for some historical info on it but couldn't find anything.
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