Mercedes-Benz M196 engine

Mercedes-Benz M196
Overview
Manufacturer	Daimler-Benz
Production	1954-1955
Layout
Configuration	Straight-eight
Displacement	2,496 cm3 (152 cu in) (M 196 R) 2,982 cm3 (182 cu in) (M 196 S)
Cylinder bore	76 mm (3.0 in) (M 196 R)[1] 78 mm (3.1 in) (M 196 S)[2]
Piston stroke	68.8 mm (2.7 in) (M 196 R) 78 mm (3.1 in) (M 196 S)
Valvetrain	Desmodromic valvetrain, DOHC, two valves per cylinder[3][4]
Compression ratio	12:1 (M 196 R)[5] 9:1 (M 196 S)[2]
Combustion
Operating principle	Four-stroke Otto
Fuel system	Direct fuel injection
Fuel type	Esso RD1 (M 196 R) Super petrol 98 RON leaded DIN 51600 (M 196 S)[6]
Oil system	Dry sump
Output
Power output	256 PS (188 kW) (M 196 R, 1954)[1] 265 PS (195 kW) (M 196 R, 1955)[5] 290 PS (213 kW) (M 196 R, final version)[7] 276 PS (203 kW) or 310 PS (230 kW) (M 196 S)[2]
Torque output	30 kp⋅m (294 N⋅m) (M 196 R)[5] 31.7 kp⋅m (311 N⋅m) (M 196 S)[2]

The Mercedes-Benz M196 engine is a naturally-aspirated, straight-8, racing engine, designed, developed, and produced by Daimler-Benz; and used in both sports car racing and Formula One racing, between 1954 and 1955.^{[8][9][10][11][12]} Daimler-Benz made two versions of the engine, the M 196 R, displacing 2.5 litres, and the M 196 S, displacing 3.0 litres.

Mercedes pulled out of all motorsports after the 1955 Le Mans disaster. This was their last Formula One engine, and Mercedes did not return to motorsport as an engine manufacturer until 1994, when they supplied engines to the Sauber Formula One team.^[13]