IN THE usual auttmobile poppet valve the poppet or mushroom valves are lifted from their seats by cams and reseated by springs. In a four·cycle motor, the valves in each cylinder are Oiened and ...

Other features of the single-sleevevalve engine are said to be silence, favorable comparison in weight with that of the poppet-valve engine; added strength and rigidity due to the depth of 4 engine ...