英语翻译When compared to a gasoline engine of the same displacem

英语翻译
When compared to a gasoline engine of the same displacement,a diesel's biggest disadvantage is weight.Usually,diesel engines have a weight per horsepower of one and a half to three times more than gasoline engines.The reason for the increased weight is that a diesel engine relies on a high compression ratio.
In a diesel,the air is heated by the squeezing action of the piston and the fuel is ignited by being sprayed into the heated air.As a result,its combustion pressure is much higher than a gasoline engine; a robust structure is required to withstand the high pressure.The combustion pressure of a naturally aspirated (no turbocharger) diesel engine is about one and a half times higher than that of a naturally aspirated gasoline engine.
Another reason the output of a diesel engine per cubic inch is less than that of the gasoline engine is because a spark-ignition engine can operate at a higher rate of speed.This is due to the combustion burn rate of gasoline being faster.Diesel fuel has a reduced combustion efficiency at high speeds because of the longer ignition delay,longer injection duration (in crankshaft angle degrees),and from the slow mixing rate.In diesel engines,the government-mandated smoke limits are very hard to meet at high speeds since the engine doesn't have enough cylinder event time to burn all of the fuel.Since the diesel engine has a high compression ratio,the energy required to revolve the engine itself,or what is known as friction loss,is greater than that of the gasoline engine.Therefore,when speed is increased to boost horsepower output,the friction loss raises enough to offset the output component of the engine.For a production-style gasoline race engine,a practical maximum speed is around 10,000 rpm.A similar diesel engine would only be able to achieve appAll modern light- to medium-duty diesel engines sold for use in a motor vehicle in the U.S.are of the Otto cycle (four-stroke) design.In the four-stroke diesel cycle,the following sequence of events is continuously repeated when the engine is running:roximately 5,000 rpm.
During this time,the piston is moving downward and only air is drawn into the cylinder.This occurs on a normally aspirated engine as a result of the difference between atmospheric pressure and the depression created by the piston and the piston ring seal.On forced-induction applications,the induction process is aided by the external air movement caused by the turbocharger or supercharger.
The piston is moving upward in the bore and compresses the air into the very small volume of the combustion chamber and raises its temperature high enough to ensure auto-ignition of the fuel charge.This demands a compression ratio higher than that employed in a gasoline engine.The air is heated by the friction of the molecules being packed into a very small area.
The proper name for this event is "expansion" because of the flame expanding against the piston.

和相同尺寸的汽油机相比,柴油机最大的缺点是重量较大.柴油机的单位功率重量是汽油机的1.5—3倍,其原因是柴油机的压缩比比汽油机高很多.
在柴油机里面,空气的加热是通过活塞对空气的压缩来完成的,而雾化后柴油的发火则是依赖于加热后的空气.因此,柴油机发火后的压力远远高于汽油机.为了承受巨大的压力,柴油机必须具有坚固的结构.非增压柴油机的爆压比同类型的汽油机高1.5—3倍.
柴油机单位体积的输出功率比汽油机小的另一个原因是火花点火式发动机（汽油机）的转速要比压燃式的高很多.这是由于汽油机的燃烧要比柴油机快很多.
当柴油机运行在高转速时,由于点火延时、喷油延时都将变长,而油气混合的速度变慢,柴油机的燃烧效率将会显著降低.
再问： 下面怎么不翻译了，翻译的很好，就是不太全啊