Otto cycle internal combustion engine giving increased performance

Claim 1

An improvement in a piston-type internal combustion engine, in particular an Otto cycle engine, giving increased performance, characterized in that use is made of a first and second separate in-piston combustion chambers formed in the crown of each piston of said engine, each of said combustion chambers being shaped as a sector of an annulus the center of which coincides with the center of the piston crown, the volume of said first combustion chamber being larger than the volume of said second combustion chamber such that during said compression stoke a pressure differential will be created between said first and said second combustion chambers, said combustion chambers located in positions corresponding, respectively, to that of an inlet valve via which fuel-air mixture is admitted, and to that of an exhaust valve via which post-combustion gases are expelled; and in that communication is enabled between said first and second combustion chambers with said piston at top dead center, by way of a gap such that a channelized flow of combustion gases is created from said first combustion chamber of larger volume to said second combustion chamber of smaller volume immediately prior to and at the moment of ignition, said gap existing between said crown of said piston and a cylinder head of said engine.