Flat-16

A flat-16 is an internal combustion engine in flat configuration, having 16 cylinders.

Few examples are known. Porsche ran some tests with a flat-16 version of the Porsche 917, but it was never raced. Coventry Climax developed a flat-16 engine designated the FWMW; work on this continued through the later years of the 1.5 L formula with Lotus and Brabham the likely recipients. The formula ran out before it showed any clear advantage over the V8.

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, H
W	8, 9, 12, 16, 18
Other inline	H, VR, Opposed, U (Square), X
Other	Hemi, Radial, Rotary, Pistonless, Deltic, (Wankel)