A Study on a Crankcase Supercharged 4-Stroke Cycle Engine - Case of Using Rotary Disc Valves -

Abstract

To improve the volumetric efficiency of a crankcase-supercharged 4-stroke cycle engine in the high speed range, rotary disc valves were used at both the inlet and the outlet sides of the crankcase in an investigation of the effects of opening angle and timing of disc valves on the volumetric efficiency. As a result it was found that a volumetric efficiency of 120% was possible over a wide engine speed range of 3000-6000 rpm, which was not possible by using the reed valve system. © 1990, The Japan Society of Mechanical Engineers. All rights reserved.