The practical limit for an unbalanced inline-four is around 2.4 litres.

一个不稳定的直排四缸引擎的实际排量极限大约在2.4升。

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You've now completed one out of five inline maps. Using the same process, create four more inline maps using the following information.

您现在已经完成了五个内联映射中的一个。

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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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As for new offerings from Porsche, something based-on-but-smaller-than the Boxster (built on a VW platform, possibly with an inline-four engine), will come in the next year or two.

FORBES: Porsche Plans Small 'Cajun' SUV, New Sports Car Under Boxster

Under the Hood: A new 2.4 literDOHC 16-valve inline four that makes 185 hp.

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