When you start a V-8 engine, you are only driving two cylinders (1 liter) through their compression strokes, but with one big cylinder you would have to compress 4 liters instead.

当你启动V - 8发动机时，只是通过压缩冲程驱动了两个气缸(1升)，但是如果是一个大气缸你必须要压缩4升。

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Unlike the better balanced straight-six or even the ultra-smooth V-12 engine, the humble four-cylinder generates an up and down vibration with a frequency of twice the crankshaft's rotational speed.

不像运行起来比它更稳定的直列六缸引擎或者极其流畅的V - 12引擎，卑微的四缸引擎会以一种比自身机轴转速高两倍的频率产生一上一下的振动。

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That is why luxury cars have invariably used much smoother inline-six engines or v-8s-and why most of the new breed of four-cylinder motors rarely exceed two litres.

这就是豪华汽车始终更多地采用直排六缸引擎或者V - 8s引擎，以及多数四缸引擎系类的汽车的排量很少超过两升的原因。

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Silverado and Sierra will accomplish its new mileage pinnacle with a 5.3L EcoTec3 V-8 relying on direct injection, cylinder deactivation and variable-valve timing to achieve EPA estimates of 16 mpg in the city and 23 mpg on the highway with two-wheel drive, or 16 in the city and 22 on the highway with four-wheel drive.

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For the Ford F-150, the most popular vehicle on American roads, they take out the inevitable V-8, and replace it with a four-cylinder engine, an average of 22-kilowatt-hour battery packs, and two 60-kilowatt electric motors.

FORBES: Written by Jim Motavalli

The index found a 12 percent improvement in new car fuel economy, which is reflective of wholesale abandonment of V-8-powered SUVs and trucks in favor of four-cylinder compacts.

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