Miller-Cycle Engine

Miller-Cycle engine is a modified 4-stroke gasoline engine.   During the intake stroke, a supercharger feeds highly compressed air to an intercooler.   The cooled, compressed air is fed directly into the cylinders.   During the intake stroke the intake valve remains open for a longer than normal time, which prevents copression from occurring until the piston has moved 1/5 of the way toward TDC.   Then the valve closes and compression occurs.   Because of the lengthened intake stroke and the constant supply of air from the supercharger, the cylinder is filled with air and fuel.   The shortened compression stroke keeps compression ratios and cylinder temperatures lower.   The power stroke begins as soon as the piston is readyh to move in its bore and continues until it reaches BDC.   This longer power stroke provies more torque and increased efficiency.   The exhaust stroke is the same as in the gasoline engine.   This engine delivers a smooth and large amount of power for a small engine. ^{Erjavec 202}