Omaks moped engine

All types of Omaks moped scooters can be divided into two classes - with two-stroke and four-stroke engines. The design and features of all systems are also due to the type of engine.

 In these moped engines, the duty cycle occurs in four strokes of the piston (stroke) and two turns of the crankshaft Omaks: inlet - piston descends from TDC and sucks the combustible mixture through the open intake valve; compression - rising from NMT piston compresses the combustible mixture with the valves closed; working stroke - the mixture burns, ignited by an electric spark, and the resulting gases, expanding, move the piston down (this stroke of the piston is called working, because useful work is being done at this time); exhaust - an upwardly moving piston pushes the exhaust gases through an open exhaust valve.

  In two-stroke engines, in contrast to four-stroke engines, the duty cycle occurs during one revolution of the crankshaft. Another feature - the lack of valves (intake and exhaust) with a mechanical drive. Their role is performed by the piston itself, opening and closing special windows on the surface of the cylinder. Crankcase volume under the piston is also used for gas exchange. When the piston moves upward from the BDC, the volume under the piston increases and a vacuum is created in it. Under its action, the combustible mixture enters the podporshne space. At the same time, the upwardly moving piston displaces the remaining gases from the previous cycle from the cylinder.