RS550 specs

List price (1955): US$6,800.00

Engine

  • Design Four cylinder 4 cycle, box motor, air cooler, horizontal opposed, 4 overhead camshafts
  • Power approx 110 HP @ 6200 RPM
  • Bore 3.35 in (85mm)
  • Stroke 2.59 in (66mm)
  • Piston Displacement 1498 actual, from formula cubic 1487cm
  • Compression ratio 9.5:1
  • Crankcase Aluminum
  • Cylinders Aluminum hard chromed walls
  • Cylinder head Aluminum
  • Valves per cylinder 1 intake, 1 exhaust
  • Valve operation 4 camshafts driven by 2 vertical shafts
  • Crankshaft Full roller bearing, built up
  • Pistons Aluminum
  • Air blower drive V-belt, crankshaft to generator shaft
  • Crankshaft-blower ratio 1:1
  • Air volume 1100 ltr/sec at 6200 RPM
  • Engine lubrication Dry sump, with oil cooler and oil filter in main current
  • Firing order 1-4-3-2
  • Distributor drive Camshaft
  • Spark plugs Temperature valve 260 – 280
  • Carburetors Solex 40 PJJ or Weber 40 DCM
  • Muffler 2 mufflers leading into 1 exhaust pipe
  • Clutch Fichtel & Sachs, K 12 Porsche Special
  • Transmission 4 forward speeds, helical gears, synchronized, 1 reverse
  • Gear ratio
    • 1st gear, 11:35
    • 2nd gear, 17:30 – 16:31 – 18:29
    • 3rd gear, 23:26 – 22:27 – 24:25
    • 4th gear, 27:22 – 25:24 – 26:23
    • Reverse 1:3.56
  • Shifting Ball and socket and push rods
  • Rear axle Spiral bevel pinion, ZF lock type differential
  • Gear ratio 8:35 – 7:31 – 7:34
  • Top speed Approx 140mph (220km/h)

Chassis

  • Frame Tubular, seamless steel tubing
  • Front springing 2 transverse, 4-leaf adjustable torsion bars
  • Rear springing 1 round torsion bar on each side
  • Shock absorbers
    • Fichtel & Sachs, telescopic hydraulic
    • Front: 26 x 90
    • Rear: 36 x 140 HA
  • Front wheel suspension Longitudinal suspension arms, outside needle bearings
  • Rear wheel suspension On oscillating half axles
  • Steering Special worm gear with divided tie rods
  • Steering ratio 1:14.15
  • Operating brakes Oil hydraulic foot brakes to all four wheels
  • Parking brake Hand lever operating cable to rear wheels
  • Brake drums 11.0236 in (280mm)
  • Brake lining width 1.5748 in (40mm)
  • Total effective surface 115 sq in (744 sq cm)
  • Wheels Disc
  • Rims Aluminum
  • Tires
    • Front: 5.00 – 16
    • Rear 5.25 – 16

Dimensions

  • Wheel base 83 in (2100mm)
  • Front tread 50 – in (1290mm)
  • Rear tread 49 – in (1250mm)
  • Length overall 11 ft 9 – in (3600mm)
  • Width overall 5 ft 1 in (1550mm)
  • Height (unloaded) 3 ft 4 in (1015mm)
  • Minimum ground clearance Approx 6 in (150mm)
  • Minimum turning circle Approx 36 ft (11m)

Weight

  • Dry weight Approx 1300 lbs (590kg)
  • Empty weight (DIN) Approx 1510 lbs (685kg)
  • Service weight (FIA) Approx 1410 lbs (640kg)
  • Permissable total weight Approx 1984 lbs (900kg)
  • Permissable axle weight
    • Front: 992 lbs (450kg)
    • Rear: 992 lbs (450kg)

Electrical Accessories (6 volt)

  • Battery Varta Special 6 V/70 amp
  • Starter
    • Bosch EED 0.4/6 L 18
    • Bosch LI/GE 160/2 2500 L 10
  • Generator (LI 20/1 P 45)
  • Voltage regulator Bosch RS/UA 160/6/15
  • Distributor Bosch 2 V 2/6 K 10
  • Coil Bosch TK 6 A/5
  • Spark plugs Bosch W 260 T 2 – W 270 T 17 or equivalent type
  • Ignition switch Bosch SH/ZS 1/1
  • Starter switch Kirsten 5232
  • Light switch Kostal 7473/3 with voltage regulator
  • Beam deflector switch Bosch SHNF 2/1
  • Blinker unit SWF 2 x 20 watt, Type BGA
  • Blinker switch Bosch SH 12/27 HI (2 circuit) without bulb
  • Brake light switch Teves (On master brake cylinder)
  • Head lights Bosch LE/YE 180/X 2/7
  • Blinker and park light Bosch LE 14/16 N 2
  • Tail, brake, blinker & back up lights Bosch LE 14/16 N 1
  • License plate lights SWF EL 153-1
  • Horn Bosch HO/EZ 32/32 D 1 or D 2

Original Bosch electrical parts can be found here

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