Patent ID: 6101989
Filing Date: 2000-08-15
Classification: F02B,F02M,Y02T

Abstract:
A method of making an improved low emission mechanical power plant by modifying a baseline, compression ignited, two stroke diesel engine of the type having a compression/combustion stroke and including a combustion cylinder defined by a cylinder liner having a central axis and a plurality of air inlet ports having side walls, said combustion cylinder having an exhaust outlet port; a piston reciprocally movable within the combustion cylinder, said piston having a combustion bowl of a first diameter; a valve for opening and closing the exhaust outlet port; and injector for injecting fuel into the combustion chamber at a first spray angle; and a camshaft rotatable through an angle of 360 degrees for lifting the valve relative to the exhaust port, the method comprising the steps of:(a) modifying the camshaft of the baseline compression ignited, two stroke diesel engine to cause opening and closing of the exhaust valve in a manner to allow, after said combustion stroke, a buildup of exhaust gases within said cylinder in a quantity sufficient to absorb combustion heat to an extent to limit the combustion temperature to a temperature that will limit the formation of nitrogen oxide to a degree that, following the combustion stroke, the exhaust gases formed will contain nitrogen oxide an amount less than 6.0 grams per brake horsepower-hour; and(b) modifying the cylinder liner and the combustion bowl of the piston of the baseline compression ignited, two-stroke engine in a manner to limit the formation of particulate matter within the combustion gases to an amount less than about 0.1 grams per brake horsepower-hour.