第二个冲程使得活塞向上运动。
比四冲程发动机制造成本更低。
四冲程汽油在摩托车发动机。
汽车发动机除了四冲程循环是否还有其他循环？
Are there any other cycles besides the Otto cycle used in car engines?
同时分析了下冲程抽油杆所产生的螺旋弯曲变形。
Deformation of helical buckling appeared on rod during down stroke is also analyzed.
主要用来做两冲程通用汽油机的排放及性能实验。
It can used to do emission and performance test of two-stroke engines.
二冲程发动机没有移动的阀，火花塞每次点火活塞到达循环顶端。
A two-stroke engine has no moving valves, and the spark plug fires each time the piston hits the top of its cycle.
为了克服这两个问题的超支冲程发动机，一个飞轮装置安装。
In order to overcome the problems of overrun for the two-stroke engine, a freewheel device was fitted.
二冲程发动机使用更多的汽油，燃烧更多的燃料，所以产生更多的污染。
However, a two-stroke engine USES more gasoline and burns lots of oil, so it is far more polluting.
飞机由一台360马力风冷、四冲程汽油活塞发动机提供动力。
The aircraft is powered by a 360hp air-cooled, four-stroke, petrol (gasoline) piston engine.
低速柴油机是体积较大、缸体较长、机身较重的二冲程柴油机。
Slow speed diesel engines are large, especially tall, and heavy and operate on the two-stroke cycle.
由于二冲程和四冲程发动机，自行车是一种权力的道路的一个缩影。
With two-stroke and four-stroke engines, the bike is an epitome of power on road.
四冲程发动机的工作循环是以活塞在上止点、进气门打开为开始的。
The cycle of operation of the four-stoke engine begins with the piston at TDC and the intake valve open.
发动机完整的循环要求有活塞的四个冲程：进气、压缩、做功、排气。
The complete cycle of an engine requires four piston strokes: intake, compression power, and exhaust.
你的问题也能引出一些新的观念，比如，变冲程的发动机和电汽混合机等等。
You question actually also brought up some other new concepts, such as variable displacement engine, and Hybrid, etc.
二冲程和四冲程发动机的区别：大多数链锯和摩托艇使用的是二冲程发动机。
What is the difference between a two-stroke and a four-stroke engine? Most chain saws and boat motors use two-stroke engines.
转子活塞发动机用的是四冲程循环，但是它们和四冲程活塞发动机有很大不同。
Gas turbine engines use the Brayton cycle. Wankel rotary engines use the Otto cycle, but they do it in a very different way than four-stroke piston engines.
在二冲程发动机中你必须混和燃料和气体，因为气缸壁上的孔阻止使用活塞环密封燃烧室。
You have to mix oil into the gas in a two-stroke engine because the holes in the cylinder wall prevent the use of rings to seal the combustion chamber.
在二冲程发动机中你必须混和燃料和气体，因为气缸壁上的孔阻止使用活塞环密封燃烧室。
You have to mix oil into the gas in a two-stroke engine because the holes in the cylinder wall prevent the use of rings to seal the combustion chamber.
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