The next entry moves much farther back in Porsche's history. The 804 Formula One car packs an air-cooled 1.5-litre, flat-eight engine that makes quite a noise. In this clip, the rear cover is off, which exposes the velocity stacks on the carburettors.

This engine has the smallest displacement of the bunch, but it makes a mighty sound with the gauge showing 137.8 decibels.