High speed indirect injection diesel engine

In an internal combustion engine having a cylinder and a piston movably disposed in said cylinder for reciprocal motion, a cylinder head secured over said cylinder and piston to form a combustion chamber, an intake port extending through said cylinder head and an intake valve operably mounted in said intake port for allowing air to be admitted into said combustion chamber, an exhaust port extending through said cylinder head and an exhaust valve operably mounted in said exhaust port for allowing exhaust gases to exit said combustion chamber;

• the improvement characterized by:
• a pre-combustion chamber having a transfer passage communicating with said combustion chamber with a first end of said passage being in proximity to said pre-combustion chamber and an opposite second end of said transfer passage being in proximity to said combustion chamber;
• said transfer passage having a longitudinal axis acutely angled with respect to an upper surface of said piston;
• said pre-combustion chamber having a generally disc like shape with a circular cross-sectional vertically oriented periphery and substantially flat side vertical walls, said transfer passage having its first end connected to the pre-combustion chamber through said circular periphery.

A piston for an internal combustion engine, the piston characterized by:

• said piston having an upper surface;
• said upper surface of said piston having a recess;
• said recess having a valve receiving section including a plurality of lobes with each lobe being sized to fit a respective intake and exhaust valve when said piston is installed in an engine and said respective valve is in a partially open position and when said piston is at or near TDC;
• said lobes connected to a common passage section that extends from said lobes to a position in proximity directly under a wide open end of a transfer passage of a pre-combustion chamber to receive gases exiting said pre-combustion chamber through said transfer passage and to deliver said gases to both of said lobes;
• said passage section being tapered with a narrow section aligned under said transfer passage and a wide section commonly connected to each lobe.

In an internal combustion engine having a cylinder and a piston movably disposed in said cylinder for reciprocal motion, a cylinder head secured over said cylinder and piston to form a combustion chamber, an intake port extending through said cylinder head and an intake valve operably mounted in said intake port for allowing air to be admitted into said combustion chamber, an exhaust port extending through said cylinder head and an exhaust valve operably mounted in said exhaust port for allowing exhaust gases to exit said combustion chamber;

• the improvement characterized by:
• said piston having an upper surface;
• said upper surface of said piston having a recess;
• said recess having a valve receiving section being sized and positioned such that when said piston is installed in an engine and said respective valve is in a partially open position and when said piston is at or near top dead center, said respective intake and exhaust valve is received in said valve receiving section;
• said intake valve being operably mounted in said engine to open when said piston is approximately 30.degree. before top dead center and to have a real duration of approximately 270.degree.;
• and said exhaust valve being operably mounted in said engine to open at approximately 120.degree. after top dead center and to close when said piston is approximately 30.degree. after top dead center for said real open duration being approximately 270.degree..