Combustion engine, particularly ignited four stroke engine

Details Combustion engine, particularly ignited four stroke engine Combustion engine, particularly ignited four stroke engine

F - Mech Eng,Light,Heat,Weapons

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F02B 31/00 (2006.01) F02B 23/08 (2006.01) F02B 1/04 (2006.01) F02B 75/02 (2006.01)

Patent

CA 1280651

ABSTRACT A mixture-compressing spark-ignited four-stroke internal combustion engine having a combustion chamber bounded by the piston and the cylinder head, and inlet and exhaust valves, the valve openings of which are off- set in plan view in the longitudinal direction of the engine with respect to a transverse plane of the cylinder and the valve stems of which form an acute angle when projected onto the transverse plane of the cylinder, and a squish area opposite a spark plug and parts of the inlet valve opening being mashed and supplied with a mixture by a swirl inlet passage, the swirl inlet passage supplying a mixture to the inlet valve opening tangenti- ally, a spark plug being disposed closed to the center of the cylinder on the side facing the inlet valve opening, a squish area being provided opposite the spark plug amounting to between 5% and 15% of the cylinder cross- sectional area, and the inlet valve opening being masked on its flow downstream area toward the outer periphery of the cylinder by a downward projection from the top of the combustion chamber through the angle of between 70° and 180° at a height of between 70% and 100% of the valve stroke over a gap width of between 1 and 1.5 mm.

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