Porsche RS550  1955

Porsche RS550 1955

Edward P.
1955 Porsche RS550 Engine Design: Four cylinder air cooled, horizontal opposed, 4 overhead camshafts. Power: Approximately 110 PS (81 kW) at 6200 rpm. Bore: 3.35 in (85 mm). Stroke: 2.59 in (66 mm). Piston Displacement: 1,498 cc (91.4 cu in) Compression ratio: 9.5:1. Crankcase: Aluminium. Cylinders: Aluminium hard chromed walls. Cylinder head: Aluminium. Valves per cylinder: 1 intake, 1 exhaust. Valve operation: 2 camshafts per head driven by vertical shafts. Crankshaft: Full roller bearing, built up. Pistons: Aluminium. Air blower drive: V-belt, crankshaft to generator shaft. Crankshaft-blower ratio: 1:1. Air volume: 1100 L/s 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 ratios: 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 Rear axle: Spiral bevel pinion, ZF lock type differential. Gear ratio: 8:35 – 7:31 – 7:34 Top speed: Approx 140 mph (220 km/h). Chassis Frame: Tubular, seamless steel tubing Front springs: 2 transverse, 4-leaf adjustable torsion bars Rear springs: 1 round torsion bar on each side Shock absorbers: Fichtel & Sachs, telescopic hydraulic Front: 26 x 90 Rear: 36 x 140 Steering ratio: 1:14.15 Operating brakes: Oil hydraulic foot brakes to all four wheels Brake drums: 11.0236 in (280 mm) Rims: Aluminium Tyres: Front: 5.00 – 16 Rear 5.25 – 16 Dimensions Wheel base: 83 in (2100 mm) Front tread: 50 in (1290 mm) Rear tread: 49 in (1250 mm) Length overall: 11 ft 9 in (3600 mm) Width overall: 5 ft 1 in (1550 mm) Height: (unloaded) 3 ft 4 in (1015 mm) Minimum ground clearance: Approx. 6 in (150 mm) Minimum turning circle: Approx. 36 ft (11 m) Weight Dry weight: Approx. 1300 lb (590 kg) Empty weight: (DIN) Approx. 1510 lb (685 kg) Service weight: (FIA) Approx. 1410 lb (640 kg) Permissible total weight: Approx. 1984 lb (900 kg) Axle weight: Front: 992 lb (450 kg) Rear: 992 lb (450 kg)
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