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The old motor roars back

机译:旧车轰鸣

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Small cars sometimes struggle to climb steep hills. But a converted Chevrolet Lacetti has something special to help it along. Instead of having to keep changing down and revving harder to ascend a winding Alpine-type test track, the engine can cruise almost to the summit in top gear. This is because the car benefits from one of the developments that in these more economical and greener times promises to give the petrol engine a new lease of life.rnOld technologies have a habit of fighting back when new ones come along. This is not surprising because they often have an enormous amount of design, engineering and production knowledge invested in them-especially so in the case of car engines. So new hybrid systems, fuel cells and electric motors will be chasing a moving target. The internal combustion engine will be getting better too.rnThe Lacetti is just one example. It gets its extra oomph from a supercharger forcing more air into the combustion chambers of its engine. This is an old idea that used to speed up 1920s racing cars, like "blower" Bentleys. But their engines tended not to last very long. With stronger engines, superchargers have been staging a comeback in big cars. The one in the Lacetti is different: it is a dual-speed supercharger that provides its highest boost at low speeds. This gives the car a huge 40% increase in torque, or pulling power.
机译:小型汽车有时很难爬上陡峭的山丘。但是改装的雪佛兰Lacetti有一些特别的帮助。不必费力地继续降低速度和提高速度来提升蜿蜒的Alpine型测试轨道,该发动机几乎可以以最高档位巡航至山顶。这是因为汽车得益于在这些更经济,更环保的时代所带来的发展之一,这些发展有望使汽油发动机重获新生。旧技术习惯于在新技术出现时进行反击。这不足为奇,因为他们通常会投入大量的设计,工程和生产知识,尤其是在汽车发动机方面。因此,新的混合动力系统,燃料电池和电动机将追逐一个移动的目标。内燃机也将越来越好。拉切蒂只是一个例子。它从增压器中获得了更大的吸引力,迫使更多的空气进入其发动机的燃烧室。这是一个古老的想法,曾经用来加速1920年代的赛车,例如“鼓风”的Bentleys。但是他们的引擎往往不会持续很长时间。有了更强大的发动机,增压器已经开始在大型汽车中卷土重来。拉切蒂(Lacetti)中的一个与众不同:它是一种双速增压器,在低速时可提供最大的增压。这使汽车的扭矩或拉力大大提高了40%。

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    《The economist》 |2008年第8593期|77-78|共2页
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