Porsche Type 911 5x/70 (1971)
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Home » Racing Engines » Porshce Type 911/5x

Specifications

Porsche Type 911/51, 911/52, 911/53, 911/57 engines
Porsche Type 911/70 racing engines
Introduced in 1971
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Dimensions

Cylinders arrangement: flat boxer 6 cyl with 180º included angle
Strokes: 4

Basic version

All engines codes 911/51, 911/52, 911/53, 911/57
Bore x Stroke: 84.0 mm x 70.4 mm, 3.307" x 2.772"
Capacity: 2341.53 cc, 142.9 ci

Racing versions

Engine Code Bore x Stroke Capacity
911/70 86.7 mm x 70.4 mm, 3.413" x 2.772" 2492 cc, 152.1 ci

Construction materials

silumin alloy crank case. Magnesium alloy crank case for 911/70. 124.5mm bore spacing, with cast iron cylinder liners coated with fins for air cooling
Aluminium alloy head with hemi combustion chamber
forged steel crankshaft with 8 plain main bearings 57mm diameter, big end journal diameter 57mm
steel connecting rods, 130mm distance center to center, 61mm big end bearing diameter
titanium connecting rods for 911/70

Cylinder-head

2 x 1 overhead camshafts (SOHC), chain driven
2 valves/cyl. - 12 valves total. 46mm inlet valve diameter, 40mm exhaust valve diameter.
911/70: Hollow, sodium-filled exhaust valve

Aspiration

Ignition

BHKZ Bosch electonic ignition
single Bosch X 270 P 21 spark plug, Bosch coils and Bendix fuel pumps
850 W alternator
Magnetti Marelli twin plugs/cylinder for 911/70
firing order 1-6-2-4-3-5
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Cooling and lubrication

aircooled
Dry sump with 1 oil cooler. 11 lt oil capacity

Models used and Output

Year Model, Engine Induction Compression ratio Power Torque
1971 Porsche 911 T type E, 911/51 Bosch Kugelfisher MFI 7.5:1 140 HP @ 5600 rpm 200 Nm (148 ft·lb) @ 4000 rpm
1972 Porsche 911 E Type E, 911/52 Bosch Kugelfisher MFI 8.0:1 165 HP @ 6200 rpm 205 Nm (151 ft·lb) @ 4500 rpm
1972 Porsche 911 S Type E, 911/53 Bosch Kugelfisher MFI 8.5:1 190 bhp (142 kW) @ 6500 rpm 215 Nm (158 ft lbs) @ 4000 rpm
1972 Porsche 911 T Type E, 911/57 2 x Zenith 40 TIN carbs 7.5:1 130 HP @ 5600 rpm 194 Nm (144 ft·lb) @ 4000 rpm
Racing engines
1972 Porsche 911 S/T, 911/70 Bosch Kugelfisher MFI 10.3:1 270 hp @ 8000 rpm 192 lb/ft @ 5300 rpm
Phantom+view+of+Porsche+MFI+engine1202346303.jpg Source

Drawings

Schematic+view+of+the+Porsche+MFI+system1235690811.jpg Source
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Injection pump for D-jetronic mechanical pulse injection
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