Porsche Type 911 5x/70 (1971)

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Specifications

Porsche Type 911/51, 911/52, 911/53, 911/57 engines
Porsche Type 911/70 racing engines
Introduced in 1971
Click here
Click here for registry numbers

Dimensions

Cylinders arrangement: Boxer 'flat' 6 cylinders, or V6 with 180º included angle, and opposed pistons arrangement
Strokes: 4
Fuel: petrol

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
Torque settings

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. 118mm 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

• Bosch "pulsed injection" D-Jetronic mechanical Fuel Injection system using Kugelfischer PL Injection pump. Click here. Injection pump Calibration sheets
• 2 x Zenith 40 TIN carbs

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
Source

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

Source

Drawings

Source
Source
Injection pump for D-jetronic mechanical pulse injection