You know it when you hear it: the grumbly, all-too-unmistakable sound of an approaching Subaru and its characteristic flat-four-cylinder engine. Since the mid-1960s, the boxer engine has been a ...

Although the basic principles of an internal combustion engine are universal, the manner in which these engines are designed and function vary greatly. Some engine configurations are designed in a ...

Subaru built the only twin turbo flat four in a production car. Here is how this rare EJ20 setup worked, why it struggled, ...