The car was powered by a four cylinder air-cooled engine.

这辆汽车是由一个四缸气冷式发动机驱动的。

《柯林斯英汉双解大词典》

The train is in fact a big bamboo bed with four wheels and a small engine.

那部火车其实就是一张大竹床，有四个轮子和一台小发动机。

youdao

What is the difference between a two-stroke and a four-stroke engine? Most chain saws and boat motors use two-stroke engines.

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。

youdao

It has a six hundred twenty-four cubic centimeter, thirty-five horsepower, gas-powered engine.

VOA: special.2009.03.28

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: Turbocharged 201-hp, 1.8-liter four engine.

FORBES: Car of the Week: 2012 Mercedes-Benz C250

The company announced at the Los Angeles Auto Show that the U.S. version of its Mazda 6 midsize sedan, which got a major redesign for the 2014 model year, will offer a new four-cylinder diesel engine, in addition to a conventional four-cylinder gasoline engine.

FORBES: Mazda Bets Big On Diesel With The All-New 2014 Mazda 6