![]() ![]() Mixture transfer continues until the piston once again rises Readily apparent in the picture is that the primary portion of the mixture isĭirected toward the cylinder wall opposite the exhaust port (this reduces theĪmount of mixture that escapes out the open exhaust port, also known as ![]() Mixture describes a circular path as shown in the picture below. The engineĭepicted in the 2 stroke engine animation and diagrams is known as a loop-scavenged two-stroke because the incoming Port openings, at which point the mixture flows up into the cylinder. Mixture in the crankcase is compressed until the piston uncovers the transfer Positive pressure in the crankcase which causes the reed valve to close. Piston is on its way back down due to the inertia of the fuel mixture,ĭuring the down stroke, the falling piston creates a Stroke (in reality, as shown in the 2 stroke engine animation, mixture continues to flow into the crankcase even when the For the purposes ofĭiscussion, the intake phase is completed when the piston reaches the top of the Air flows through the reed valveĪnd carburetor to fill the vacuum created in the crankcase. Piston in the enclosed volume of the crankcase. Rising, and has covered the transfer port openings:Īs the piston moves upward, a vacuum is created beneath the As in the 2 stroke engine animation and diagram, in thisĬase, the cycle would begin at approximately mid-stroke when the piston is The easiest way to visualize two-stroke operation is toįollow the flow of gases through the engine starting at the air inlet. The subject of the 2 stroke engine animation (and this dissertation) is known as aĬase-reedtype because induction is controlled by a reed valve Several different varieties of two-stroke engines have beenĭeveloped over the years, and each type has its own set of advantages andĭisadvantages. To tell when one part of the cycle ends and another begins. However, the two-stroke cycle can be difficult for some to visualize at firstīecause certain phases of the cycle occur simultaneously, causing it to be hard As the 2 stroke engine animation below shows, a two-stroke engine in its purest form is extremely simple in construction and operation,Īs it only has three primary moving parts (the piston, connecting rod, and crankshaft). ![]()
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