Why are some engines inverted?

The advantages of inverted engines included improved visibility for the pilot, improved access to cylinder heads and manifolds for the ground crew, having the centre of mass of a multi-bank engine lower in the engine, and having the widest part of a multi-bank engine being closer to the midline of the fuselage, which ...

Why did Germans use inverted engines?

Inverted mounting provided better visibility, lower center of gravity, and improved maintenance access. In the Bf 109, a cannon was mounted between the engine banks and fired through a propeller hub. ... This engine was also used in some Heinkel 111s and license-built versions in the Macchi MC.