Patent ID: 8800528
Filing Date: 2014-08-12
Classification: F01B,F02B,F02F,Y02T

Abstract:
1. An internal combustion engine including at least one cylinder with longitudinally-separated exhaust and intake ports, and a pair of pistons disposed in opposition to one another in a bore of the cylinder, in which a combustion chamber having an elongated ellipsoidal shape is defined between opposing end surfaces of the pistons, and the end surface of at least one of the pistons has a circumferential area defining a periphery of the end surface and a bowl within the periphery, the bowl defining a concave surface with a first portion curving inwardly from a plane containing the circumferential area toward the interior of the piston and a second portion curving outwardly from the interior of the piston through the plane containing the circumferential area.