Flat-8

From WOI Encyclopedia Italia

A flat-8 is an internal combustion engine in flat configuration, having 8 cylinders.

Few examples are known. The most famous engine of this type is the Porsche air-cooled flat-8 engine introduced in a 1,5 L version for Formula 1 that grew up to a 3 L version used in the Porsche 908

Another example is the Australian made Jabiru Aircraft 5100. This is a 5.1 litre air-cooled engine for aircraft use.

Piston engine configurations
Straight	Single, 2, 3, 4, 5, 6, 8, 9, 10, 12, 14
V	2, 4, 5, 6, 8, 10, 12, 16, 20, 24
Flat	2, 4, 6, 8, 10, 12, 16
W	8, 9, 12, 16, 18
Other inline	H, VR, Opposed, U (Square), X
Other	Hemi, Radial, Rotary, Pistonless (Wankel)