WTwo-stroke engine
WAllen Scythe
WBourke engine
WTwo-stroke engine
WScavenging (engine)
WPiston
WErnst Degner
WExpansion chamber
WWalter Kaaden
WScavenging (engine)
WPower band
WScavenging (engine)
WSchnuerle porting
WSplit-single engine
WTwo-stroke engine
WTwo-stroke diesel engine
WTwo-stroke engine