Mercedes 120 hp Grand Prix racing car, 1906

Engine type:
M 175464
Inlet valves:
1 overhead valve per cylinder, actuated via push rod and rocker arm
Ignition sequence:
1-3-4-2
No. of cylinders / arrangement:
4 / in line
Outlet valves:
1 side valve per cylinder
Configuration:
Front, longitudinal; vertical
Valve operation:
2 lateral camshafts, gear drive
Ignition adjustment:
Manually with lever on steering wheel
Combustion principle:
Four-stroke Otto
Crankshaft:
3-bearing (friction bearings of Magnalium)
Bore x Stroke:
175 x 146 mm
Fuel system:
1 Throttle-valve spraying-nozzle carburetor
Total displacement:
14040 cc
Spark plugs:
Ignition pins
Fuel supply:
Air pressure, via hand pump operated by co-driver
Compression ratio:
4.5
Fuel tank capacity:
110 l
Maximum / output / rated output:
120 hp at 1200 /min; 90 hp at 1050 /min
Rated torque:
at 850 /min
Cooling:
Water circulation cooling via feed pump, honeycomb radiator
Lubrication:
Central exhaust-pressure lubrication via lubricating pump
Cylinders:
Gray cast iron, cylinders cast in pairs
Cylinder head:
Gray cast iron, cast in one piece together with cylinders
Starter:
Starting crank
Generator:
Not fitted
Battery:
Not fitted
Ignition:
Low-voltage magneto make-and-break ignition
Ignition system:
Bosch

Hand brake:
Acting on rear wheels
Foot brake:
Acting on countershaft
Steering:
Worm-and-nut steering
Wheels:
Wooden-spoke wheels with steel hubs and rims
Front tires:
870 x 90
Frame design:
U-section pressed-steel frame
Rear tires:
880 x 120
Front wheel suspension:
Rigid axle with semi-elliptic springs
Drivetrain:
Transmission to differential countershafts, via side chains to rear wheels
Rear wheel suspension:
Rigid axle with semi-elliptic springs
Brake system:
Mechanically actuated, water-cooled
Front brakes:
Not fitted
Rear brakes:
Inside shoe brakes (rear wheels) and external band brakes (countershaft)