Specifications

Porsche Type 901
Introduced in 1964
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Dimensions

Cylinders arrangement: Boxer 'flat' 6 cylinders, or V6 with 180º included angle, and opposed pistons arrangement
Strokes: 4
Fuel: petrol
Bore x Stroke: 80.0 mm x 66.0 mm, 3.150" x 2.598"
Capacity: 1991 cc, 121.5 ci

Construction materials

silumin alloy crank case. Magnesium alloy crank case for 901/20, 901/21 and 901/22. 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 901/20, 901/21 and 901/22

Cylinder-head

2 x 1 overhead camshafts (SOHC), chain driven
2 valves/cyl. - 12 valves total.
1964-1968: 39mm inlet valve diameter, 35mm exhaust valve diameter.
1969+: 42mm inlet valve diameter, 38mm exhaust valve diameter.
901/20, 901/21 and 901/22: Hollow, sodium-filled exhaust valve

Aspiration

Engine code, aspiration
901/01: 6 x Solex 40 PI carbs
901/05: 2 x Weber 40 IDS 3C-1 carbs
901/09: Bosch Kugelfisher mechanical multipoin fuel injection
901/20: 2 x Weber 46 IDA 3C carbs (parts list)
901/21: Bosch "pulsed injection" D-Jetronic mechanical Fuel Injection system using Kugelfischer PL Injection pump. Click here
901/22: 2 x Weber 46 IDA 3C carbs (parts list)
901/30: 2 x Weber 40 IDS 3C-1 carbs

Ignition

electronic single spark, Bosch coils and Bendix fuel pumps
Magnetti Marelli twin plugs/cylinder for 901/20, 901/21 and 901/22
firing order 1-6-2-4-3-5

Source

Cooling and lubrication

aircooled with 245mm diameter 11 blades centrifugal fan, guide vanes, thermostat and cut-off air-flaps
Dry sump with 1 oil cooler. 11 lt oil capacity

Torque settings

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Models used and Output

Year	Model, Engine	Induction	Compression ratio	Valves	Power	Torque
1964	Porsche 911 Type O, 901/01	6 x Solex 40 PI carbs	9.0:1	I39, E35	130 HP (96 kW) @ 6100 rpm	173 Nm (128 ft lbs) @ 4200 rpm
1966	Porsche 911 Type O, 901/05-06	2 x Weber 40 IDS 3C-1 carbs	9.0:1	I39, E35	130 HP (96 kW) @ 6100 rpm	173 Nm (128 ft lbs) @ 4200 rpm
1966	Porsche 911 S type O, 901/02	2 x Weber 40 IDS 3C-1 carbs	9.8:1	I42, E38	158 bhp (118 kW) @ 6600 rpm	179 Nm (132 ft lbs) @ 5200 rpm
1967	Porsche 911 S type A, 901/02-08	2 x Weber 40 IDS 3C-1 carbs	9.8:1	I42, E38	158 bhp (118 kW) @ 6600 rpm	179 Nm (132 ft lbs) @ 5200 rpm
1967	Porsche 911 T type A, 901/03	2 x Weber 40 IDT 3C carbs	8.6:1	I42, E38	110 bhp (81 kW) @ 5800 rpm	157 Nm (116 ft lbs) @ 4200 rpm
1968	Porsche 911 L type A Targa, 901/06	2 x Weber 40 IDS 3C-1 carbs	9.0:1	I39, E35	130 HP (96 kW) @ 6100 rpm	173 Nm (128 ft lbs) @ 4200 rpm
1968	Porsche 911 S type A Targa, 901/08	2 x Weber 40 IDS 3C-1 carbs	9.8:1	I42, E38	158 bhp (118 kW) @ 6600 rpm	179 Nm (132 ft lbs) @ 5200 rpm
1969	Porsche 911 E type B, 901/09 or 901/11	Bosch Kugelfisher MFI	9.1:1	I42, E38	140 bhp (104 kW) @ 6500 rpm	176 Nm (130 ft·lb) @ 4500 rpm
1969	Porsche 911 S type B, 901/10	Bosch Kugelfisher MFI	9.9:1	I45, E39	170 bhp (127 kW) @ 6800 rpm	183 Nm / 135 ft·lb @ 5500 rpm
Racing engines
1964	Porsche 904, 901/20	2 x Weber 46 IDA 3C carbs	10.3:1	I42, E38	200 bhp / 149 KW @ 8000 rpm	190 Nm / 140 ft lbs @ 6000 rpm
1966	Porsche 906, 901/20	2 x Weber 46 IDA 3C carbs	10.3:1	I42, E38	210 bhp / 157 KW @ 8000 rpm	196 Nm / 145 ft lbs @ 6000 rpm
1966	Porsche 906E, 901/21	Bosch Kugelfisher MFI	10.3:1	I42, E38	220 bhp / 164 KW @ 8100 rpm	206 Nm / 152 ft lbs @ 6400 rpm
1966	Porsche 910, 901/21	Bosch Kugelfisher MFI	10.3:1	I42, E38	220 bhp / 164 KW @ 8100 rpm	206 Nm / 152 ft lbs @ 6400 rpm
1967	Porsche 907, 901/21	Bosch Kugelfisher MFI	10.3:1	I42, E38	220 bhp / 164 KW @ 8100 rpm	206 Nm / 152 ft lbs @ 6400 rpm
1967	Porsche 911R, 901/22	2 x Weber 46 IDA 3C carbs	10.3:1	I42, E38	210 bhp / 157 KW @ 8000 rpm	206 Nm / 152 ft lbs @ 6200 rpm
1967	Porsche 911 S, 901/30	2 x Weber 40 IDS 3C-1 carbs	9.9:1	I42, E38	170 HP / 127 kw @ 6800 rpm	195 nm / 144.0 ft lbs @ 5200 rpm
1968	Porsche 911, 901/30	2 x Weber 40 IDS 3C-1 carbs	9.9:1	I42, E38	150 HP / 112 kw @ 6500 rpm
1968	Porsche 911 T/ Porsche 911 S, 901/30	2 x Weber 46 IDA 3C carbs	9.9:1	I42, E38	180 HP / 134 kw @ 6800 rpm	195 nm / 144.0 ft lbs @ 5200 rpm
1970	Porsche 911, 901/30	2 x Weber 46 IDA 3C carbs	9.9:1	I42, E38	180 HP / 134 kw @ 6800 rpm	195 nm / 144.0 ft lbs @ 5200 rpm
1970	Porsche 914/6, 901/22	2 x Weber 46 IDA 3C carbs	10.3:1	I42, E38	210 bhp / 157 KW @ 8000 rpm	206 Nm / 152 ft lbs @ 6200 rpm
1970	Porsche 914/6, 901/30	2 x Weber 46 IDA 3C carbs	10.3:1	I42, E38	200 HP / 8000 rpm	206 Nm / 152 ft lbs @ 6200 rpm