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There is one engine that is becoming dominant in the car world – the 2.0-litre four-cylinder. V12s, V10s, V8s and V6s are all on the way out, making way for these turbo fours. But why is it now the engine layout and size of choice? Mike Fernie digs deep into the engineering of the modern day engine to find out.

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Music: MB01I1QQO75JAG9

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