The in-line four-cylinder is the most widely used car engine in the world. But it wasn’t always the case. Following the 1970s and 1980s oil crisis, auto manufacturers began downsizing to smaller powertrains to improve fuel efficiency, but often with insufficient power. Today’s four-cylinder engines use superior technology such as direct injection, variable valve timing, and advanced turbocharging to produce more powerful and reliable engines. Some deliver up to 300 horsepower. The four-cylinder engine offers several advantages over larger
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