Technical Data for Type 911 Vehicles |
Engine specifications for 1969 models |
| Engine | 911 T | 911 E | 911 S |
| Type design | Air cooled, four-stroke cycle, internal combustion gasoline,
unitized with clutch, transmission, and differential into a power train at rear of vehicle. |
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| Number of cylinders | 6 | ||
| Cylinder arrangement | Horizontally opposed, two banks with three cylinders each | ||
| Bore | 80 mm | ||
| Stroke | 66 mm | ||
| Total displacement | 1991 cc | ||
| Compression ratio | 8.6:1 | 9.1:1 | 9.8:1 |
| Cylinder pressure | 9-11 kp/cm2; maximum deviation between cylinders up to 1.5
kp/cm2; tested with engine oil temperature of 60 degree C minimum. |
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| Power output (DIN) at engine speed of |
100 HP 5800 rpm |
140 HP 6500 rpm |
170 HP 6800 rpm |
| Maximum torque at engine speed of |
16 mkp 4200 rpm |
17.8 mkp 4500 rpm |
18.5 mkp 5500 rpm |
| Mean piston speed Maximum engine speed |
12.8 m/sec 6500 rpm |
14.3 m/sec 6800 rpm |
14.9 m/sec 7200 rpm |
| Governed engine speed | 6500 +/- 100 rpm | 7100 +/- 100 rpm | 7300 +/- 100 rpm |
| Fuel | 96 octane | 98 octane | 98 octane |
| Engine weight | 176 kp | 182 kp | 182 kp |
| Engine cooling | By air fan on alternator shaft | ||
| Cooling fan drive | Off crankshaft by V-belt to generator | ||
| Crankshaft to fan drive ratio |
approx 1:1.4 | ||
| Cooling air transfer rate |
1230 ltr/sec at 5800 rpm of crankshaft |
1380 ltr/sec at 6500 rpm of crankshaft |
1380 ltr/sec at 6500 rpm of crankshaft |
| Lubrication | Dry dump, forced feed | ||
| Oil cooling | Oil cooler on crankcase in cooling air stream |
Oil cooler on crankcase in cooling air stream |
Oil cooler on crankcase in cooling air stream, plus oil cooler in front section of vehicle |
| Oil pressure indication | Warning light | Pressure gauge | Pressure gauge |
| Oil pressure in warm engine at 5000 rpm |
5.5-7 kp/cm2 | ||
| Max. oil temperature | 130 C | ||
| Oil filter | Full flow | ||
| Oil capacity, incl. filter |
9 ltr | 9 ltr | 9 ltr (first filing ca. 10 ltr incl.oil cooler) |
| Oil consumption | 1.5-2.0 ltr/1000 km | ||
| Crankcase | Pressure cast, light alloy, two-piece | ||
| Crankshaft | Forged | Forged | Forged (tenifer treated) |
| Main bearings | 8 plain journal | ||
| Main bearings #1-7 | Tri-metal, split inserts | ||
| Main bearing #1 | Thrust bearing | ||
| Main bearing #8 | Sleeve insert with hard lead journal | ||
| Connecting rods | Forged steel | Forged steel | Forged steel (stress-relieved) |
| Connecting rod bearings | Split-sleeve, tri-metal inserts | ||
| Piston pin bushings | Pressed-in bronze bushings | ||
| Intermediate shaft bearings | One plain bearing with thrust shoulder on outside; inside bearing of shaft rides on housing | ||
| Pistons | Cast light alloy | Cast light alloy | Forged light alloy |
| Piston pins | Floating, secured with circlips | ||
| Piston rings | 2 compression rings 1 oil scraper |
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| Cylinders | Individual; finned grey cast | Individual; Biral with aluminum fins | Individual; Biral with aluminum fins |
| Cylinder heads | 1 per cylinder, light alloy with integral fins | 1 per cylinder, light alloy with integral fins | 1 per cylinder, light alloy with integral fins (Y-alloy) |
| Valve seat inserts | Shrunk-in, grey-cast alloy | ||
| Valve guides | Shrunk-in, special bronze | ||
| Spark plug seats | 14 x 1.25 Helicoil inserts | ||
| Valves | 1 intake and 1 exhaust per cylinder | ||
| Valve arrangement | Overhead in "V" | ||
| Exhaust valves | Sodium-filled, with reinforced seats | ||
| Valve springs | 2 coil springs per valve | ||
| Valve timing | 1 OHC per cylinder bank | ||
| Camshafts | Cast, 3-bearing camshaft riding in base metal of camshaft housing | ||
| Camshaft drive | By chain | ||
| Valve timing in cold engine and 1 mm valve clearance: | |||
| Intake opens | 15 deg BTC | 29 deg BTC | 38 deg BTC |
| Intake closes | 29 deg ABC | 39 deg ABC | 50 deg ABC |
| Exhaust opens | 41 deg BBC | 39 deg BBC | 40 deg BBC |
| Exhaust closes | 5 deg BTC | 19 deg ATC | 20 deg ATC |
| Intake valve lift at Overlap TC with .01 mm valve clearance | 2.3-2.7 mm | 3.0-3.3 mm | 5.0-5.4 mm |
| Valve clearance in cold engine (between valve and rocker arm) | |||
| Intake | 0.10 mm | ||
| Exhaust | 0.10 mm | ||
| Clutch | Single disc, dry | ||
| Pressure plate type | M 215 KSph, Fichtel and Sachs | M 215 KSph, Fichtel and Sachs | M 215 KL |
| Clutch pressure | 500-560 kp | 500-560 kp | 530-590 kp |
| Fuel system | Carburetors, 2 Weber triple-throat downdraft Type 401DT3C, resp. 401DT3C1 | Fuel injection, Bosch 6-plunger double row injection pump | Fuel injection, Bosch 6-plunger double row injection pump |
| Air filter | Induction silencer with cartridge insert | ||
| Fuel pump | 1 electric roll-cell pump | ||
| Fuel delivery rate | 80 lit/h | 125 lit/h | 125 lit/h |
| Operating pressure | 0.3 atu | 1 atu | 1 atu |
| Pressure relief valve opens at | 0.2-0.3 atu | approx 2 atu | approx 2 atu |
| Fuel filter | Fuel screen in fuel pump | Fuel screen ahead of fuel injection pump with integrated reduction valve | Fuel screen ahead of fuel injection pump with integrated reduction valve |
| Electrical system | 12 volt | ||
| Battery capacity | 2 x 12 V, 36 Ah each | ||
| Alternator output | 770 W alternator | ||
| Voltage regulator | Same make as alternator | ||
| Ignition system | Battery, coil | Battery, capacitive discharge system | Battery, capacitive discharge system |
| Ignition transformer | Bosch ignition coil TK 12 A 10 mV | Bosch | Bosch |
| Ignition distributor | Marelli S 112 AX | Bosch JFDR6 0231 159 006 | Bosch JFDR6 0231 159 007 |
| Ignition timing | 35 deg BTC at 6000 rpm | 30 deg BTC at 6000 rpm | 30 deg BTC at 6000 rpm |
| Firing order | 1-6-2-4-3-5 | ||
| Ignition advance | Centrifugal | ||
| Dwell angle | Marelli 40 deg +/- 3 deg | 38 deg +/- 3 deg | 38 deg +/- 3 deg |
| Breaker point gap | 0.4 +/- 0.03 mm resp. min 0.25 mm |
min. 0.3 mm | min. 0.3 mm |
| Spark plugs | Beru 240/14/3 250/14/3P |
Beru 265/14/3P | Beru 265/14/3p |
| Optional brands | Bosch W 230/T 30 w 250/P 21 or similar |
Bosch W 265 P 21 or similar | Bosch W 265 P 21 or similar |
| Spark plug gap | 0.6 mm (all) | ||