Two-cycle engine exhaust port

Patent · Mon Jun 10 04:00:00 EDT 1985

OSTI ID:6739936

Whipple, R B

This patent describes a cylinder liner comprising a generally cylindrical outer wall, a generally cylindrical inner wall defining a cylinder having a diameter, a bottom end and a longitudinal axis, and an exhaust port communicating with the cylinder and defined by an upper wall extending between the inner and outer walls. The upper wall has a radius of curvature equal to approximately twice the diameter and is curved concavely with respect to the bottom end. The upper wall has a radially inner edge bevelled outwardly and downwardly at an angle of approximately 45/sup 0/ with respect to the inner wall, a lower wall extending between the inner and outer walls, the lower wall having a radius of curvature approximately equal to the diameter and being curved convexly with respect to the bottom end. The lower wall has a radially inner edge bevelled outwardly and upwardly at an angle of approximately 30/sup 0/ with respect to the inner wall, and opposite side walls extending between the inner and outer walls and between the upper and lower walls. The side walls converge toward the bottom end of the cylinder and each form an angle of approximately 10/sup 0/ with a line parallel to the longitudinal axis, each of the side walls meeting the upper wall to form respective corners having an upper radius of curvature, and each of the side walls meeting the lower wall to form respective corners having a lower radius of curvature equal to approximately 1.5 times the upper radius.

• Assignee: Outboard Marine Corp., Waukegan, IL
• Patent Number(s): US 4643140
• OSTI ID: 6739936
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330100* -- Internal Combustion Engines
ENGINES
EXHAUST SYSTEMS
HEAT ENGINES
INCIDENCE ANGLE
INTERNAL COMBUSTION ENGINES
LINERS
WALLS