Mercedes 2-litre Indianapolis racing car, 1923

Mercedes 2-litre Indianapolis racing car, 1923
  • Engine type
    M 7294
  • Inlet valves
    2 inclined overhead valves per cylinder, actuated via tappets
  • Ignition sequence
    1-3-4-2
  • No. of cylinders / arrangement
    4 / in line
  • Outlet valves
    2 inclined overhead valves per cylinder, actuated via tappets
  • Configuration
    Front, longitudinal; vertical
  • Valve operation
    2 overhead camshafts, vertical-shaft drive
  • Ignition adjustment
    Manually
  • Combustion principle
    Four-stroke Otto (with supercharger)
  • Crankshaft
    3-bearing (roller bearings), built-up crankshaft
  • Bore x Stroke
    70 x 129 mm
  • Fuel system
    1 Pressurized carburetor / Roots supercharger
  • Total displacement
    1989 cc
  • Spark plugs
    1 per cylinder
  • Fuel supply
    Air and centrifugal pumps
  • Compression ratio
    7.5
  • Maximum / output / rated output
    150 hp at 4800 /min with supercharger
  • Cooling
    Water circulation cooling via rotary pump
  • Lubrication
    Pressure circulation lubrication via gear pump with fresh oil addition
  • Cylinders
    Steel cylinders in a block with welded-on cooling-water jacket
  • Cylinder head
    Not removable, welded together with cylinders
  • Starter
    Starting crank
  • Generator
    Not fitted
  • Battery
    Not fitted
  • Ignition
    High-voltage magneto ignition
  • Ignition system
    Bosch magneto
  • Hand brake
    Acting on rear wheels
  • Foot brake
    Acting on front- and rear wheels
  • Steering
    Worm-and-nut steering
  • Wheels
    Wire-spoke wheels, center mounting, faired with sheet-metal plates
  • Front tires
    4.5 x 29
  • Frame design
    U-section pressed-steel frame
  • Rear tires
    4.5 x 29
  • Front wheel suspension
    Rigid axle with semi-elliptic springs, friction shock absorbers
  • Drivetrain
    By cardan shaft to differential and rear wheels
  • Rear wheel suspension
    Rigid axle with underslung semi-elliptic springs, friction shock absorbers
  • Brake system
    Mechanically actuated
  • Front brakes
    Inside shoe brakes
  • Rear brakes
    Inside shoe brakes (rear wheels)
  • Transmission
    4-speed manual transmission
  • Shifting
    Gate shift, right interior
  • Clutch
    Double-cone clutch
  • Transmission type
    Change-speed gear
  • Final drive ratio
    3.5
  • Maximum speed
    190 km/h
  • Wheelbase
    2655 mm
  • Front track
    1360 mm
  • Rear track
    1390 mm
  • Length
    3990 mm
  • Width
    1560 mm
  • Height
    1160 mm
  • Seats
    2
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