The spent gases from the burning mixture are then

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Unformatted text preview: of the cylinder. The spent gases from the burning mixture are then released to the exhaust system. A small amount of further piston travel down the cylinder now exposes the intake port. At this point, the now pressurized mixture in the crankcase is released into the combustion chamber through the intake port. A piston dome design, unique to 2 cycle engines, is used to help 'sweep' the chamber clean of spent exhaust gases by directing the incoming rush of air/fuel up towards the cylinder head and then down towards the exhaust port. Faculty of Engineering & Applied Science Memorial University of Newfoundland ENGI 1030 Lawnmower Disassembly/Assembly As the crankshaft continues its rotation, the piston will eventually reach bottom and return to the top, repeating the Intake/Compression cycle. It can be seen by the overall design that unless the reed valve is mechanically operated, i.e. is actually a rotary valve used to accomplish the same one-way function, the crankshaft can rotate in either direction making no difference in how the engine runs. Wankel Rotary Engine Intake The fuel mixture is drawn in by the vacuum created as the chamber increases in volume with the clockwise rotation of the rotor. Compression The fuel mixture is compressed as the chamber drastically reduces in volume with the further rotation of the rotor. Ignition At the ideal time (varies depending on application) the spark plugs energize, igniting the fuel mixture. The burning mixture rapidly increases in pressure and pushes on the rotor, forcing it to continue its rotation. It is in this phase of the cycle that power is delivered to the central crank or eccentric shaft Exhaust With the continued rotation of the rotor, the spent mixture is then allowed to expand as it is pushed from the chamber into the exhaust system. Intake Compression Ignition Faculty of Engineering & Applied Science Memorial University of Newfoundland Exhaust ENGI 1030 Lawnmower Disassembly/Assembly Fuel System Gasoline engines cannot run on “liq...
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