Exhaust Impulse Engine : 2nd Report, Other Cylinder Impulse Method and Installation

Abstract

Concerning "Self cylinder impulse method", the 1st report was presented. "Other cylinder impulse method" is applied to 5, 6-and 7-cylinder engines, exhaust gas from all cylinders are exhausted into a common manifold, and the negative pressure ocurred in the manifold near top dead centre due to the exhaust impulse by the adjacent fired cylinder, is utilized to improve the scavenging efficiency. The volumetric efficiency, appling this method, increases up to about 100 %. Theoretical method for calculating pressure change in the manifold, including branch and connecting pipes, is developed. Design method and data for this method of engine are given. As an exhaust pipe length and sectional area affect pressure wave in exhaust pipe and an engine performance, a specially designed exhaust silencer in which an adjustable exhaust pipe is enclosed, and a special expansion tank should be installed when the exhaust impulse engine is actually installed.