H4 engines are horizontally opposed four-cylinder engines also commonly known by names like flat-four and boxer. For comparison, most four-cylinder automobile engines are upright inline designs. The boxer engine design dates back to the late 1880s when Karl Benz (yes, the same Benz recognized as the inventor of the first ever car) developed the Contra engine. The Benz Contra was a horizontally opposed two-cylinder with its pistons reaching the top of their stroke at the same time. Some of the
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