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What is the two stroke Outboards?
Dec 13, 2017

What is the two stroke Outboards?

The two stroke engine has only two strokes of compressed intake and work exhaust; the 4 stroke engine has intake, compression, work and exhaust in four strokes.

Most of the two stroke engines use the crankcase for scavenging. The crankcase often has air intake and air intake mechanism (some types of air intake are arranged on the cylinder block), which is used as a passageway for the combustible mixture to enter the crankcase. Because the two stroke type crankcase holds the combustible mixture from the carburetor, the crankcase must maintain a high degree of seal. Between the crankcase and gearbox of motorcycle with gear with rotary shaft lip seal (referred to as the skeleton oil seal) sealed Motorcycle Crankcase with continuously variable transmission mechanism is also used to partition the skeleton oil seal, they can not communicate with each other, to avoid the gas mixture in the crankcase leakage into the transmission in the box. The crankcase of each cylinder of the two stroke multi cylinder engine is also not connected to each other so as not to escape from each other. Most of the 2 stroke engine's valve train adopts reflux and cross flow scavenging mode. During the working process, the piston is used to carry out the air stroke near a part of the stop point, so there are exhaust ports and scavenging ports in the lower part of the cylinder. The shape, size, location and surface roughness of these ports are very important, because they are related to the scavenging efficiency of the engine and the performance of the engine. The cylinder head combustion chamber of the two stroke engine with reflux and cross flow valve train only has a hemispherical combustion chamber. There are no drive parts such as intake, exhaust port and valve and no lubricating oil channel, which is much simpler than that of the four stroke engine cylinder head.


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Add.:No.126, ChangDa Road, Yuhang economic and Technological Development Zone, Yuhang, Hangzhou

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