curvedboxformandcloselyarrangedpiston pineyeshavebeenadaptedtothetrapezoidal conrod. Thepistonpinsareshorndhavea smallerdiameter,allowingareductioninthe weightofthemassesmovingbackandforth (oscillating). Thepistonsarecooledbyoilspraynozzlesin thecrankcase.Thepistonshafthasawear- ...