1981 BMW 315 E21

This vehicle has a 2 door saloon (sedan) body style designed by Paul Bracq with a front located engine driving through the rear wheels. The BMW 315 is one of the E21 model family from BMW. The BMW 315's engine is a naturally aspirated petrol, 1.6 litre, single overhead camshaft 4 cylinder with 2 valves per cylinder. This powerplant has an output of 74 bhp (75 PS/55 kW) of power at 5800 rpm, and maximum torque of 110 N·m (81 lb·ft/11.2 kgm) at 3200 rpm. The engine transfers its power through to the wheels via a 4 speed manual gearbox. It weighs a quoted 1010 kg at the kerb. Maximum stated speed is 154 km/h (96 mph).

Pictures

Key facts

1981 BMW 315 E21 information summary

What body style?
2 door sedan/saloon with 4/5 seats
How long?
4355 mm
How heavy?
1010 kg
What size engine?
1.6 litre, 1574 cm3
How many cylinders?
4, Straight
How much power?
75 PS / 74 bhp / 55 kW @ 5800 rpm
How much torque?
110 Nm / 81 ft.lb / 11.2 kgm @ 3200 rpm
How quick?
0-100 km/h: 14.8 s
How fast?
154 km/h, 96 mph

BMW E21 models

2 door sedan/​saloon FR 4M 1767 cm3 105 PS 103.5 bhp 77 kW 1030 kg
2 door sedan/​saloon FR 3A 1767 cm3 105 PS 103.5 bhp 77 kW 1040 kg
2 door sedan/​saloon FR 4M 2316 cm3 143 PS 141 bhp 105 kW 1135 kg
BMW 323i -
2 door sedan/​saloon FR 5M 2316 cm3 143 PS 141 bhp 105 kW 1135 kg
2 door sedan/​saloon FR A 2316 cm3 143 PS 141 bhp 105 kW 1150 kg
BMW 320 -
2 door sedan/​saloon FR 5M 1991 cm3 122 PS 120 bhp 89 kW 1115 kg
2 door sedan/​saloon FR A 1991 cm3 122 PS 120 bhp 89 kW 1130 kg
BMW 316 -
2 door sedan/​saloon FR 4M 1574 cm3 90 PS 89 bhp 66 kW 1020 kg
2 door sedan/​saloon FR 4M 1766 cm3 98 PS 97 bhp 72 kW 1010 kg
2 door sedan/​saloon FR 3A 1766 cm3 98 PS 97 bhp 72 kW 1030 kg
BMW 320 -
2 door sedan/​saloon FR 4M 1991 cm3 109 PS 107.5 bhp 80 kW 1030 kg
2 door sedan/​saloon FR 3A 1991 cm3 109 PS 107.5 bhp 80 kW 1050 kg
2 door sedan/​saloon FR 4M 1991 cm3 125 PS 123 bhp 92 kW 1050 kg
2 door sedan/​saloon FR 4M 1991 cm3 112 PS 110 bhp 82 kW 1182 kg

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4 door sedan/​saloon FR 5M 1452 cm3 80 PS 79 bhp 59 kW 840 kg
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1981 BMW 315 data
bodywork
Body type4/5 seater sedan/saloon
Number of doors2
DesignerPaul Bracq
dimensions & weights
Wheelbase 2563 100.9
Track/tread (front) 1375 54.1
Track/tread (rear) 1365 53.7
Length 4355 171.5
Width 1610 63.4
Height 1380 54.3
Ground clearance
length:wheelbase ratio 1.7
Kerb weight 1010 kg 2227
Weight distribution
fuel tank capacity 58 litres 12.8 UK Gal 15.3 US Gal
aerodynamics
Drag coefficient
Frontal area
CdA
engine
engine type naturally aspirated petrol
Engine manufacturer BMW
Engine code
Cylinders Straight 4
Capacity 1.6 litre
1574 cc
(96.051 cu in)
Bore × Stroke 84 × 71 mm
3.31 × 2.8 in
Bore/stroke ratio 1.18
Valve gear single overhead camshaft (SOHC)
2 valves per cylinder
8 valves in total
maximum power output
(DIN)
75 PS (74 bhp) (55 kW)
at 5800 rpm
Specific output
(DIN)
47 bhp/litre
0.77 bhp/cu in
maximum torque
(DIN)
110 Nm (81 ft·lb) (11.2 kgm)
at 3200 rpm
Specific torque
(DIN)
69.89 Nm/litre
0.84 ft·lb/cu3
Engine construction
sump wet sumped
compression ratio 9.5:1
Fuel system 1 Pierburg carburettor
bmep (brake mean effective pressure) 878.2 kPa (127.4 psi)
Maximum RPM
crankshaft bearings
Engine coolant Water
Unitary capacity 393.5 cc
Aspiration Normal
Compressor N/A
Intercooler None
Catalytic converter N
performance
Acceleration 0-80km/h (50mph)
Acceleration 0-60mph
Acceleration 0-100km/h 14.8 s
Acceleration 0-160km/h (100mph) -1.00 s
Standing quarter-mile
Standing kilometre
Maximum speed 154 km/h (96 mph)
Power-to-weight ratio 74.29 PS/tonne (1000 kg)
54.64 kW/tonne (1000 kg)
73.27 bhp/tonne (1000 kg)
0.03 bhp/lb
Weight-to-power ratio 18.3 kg/kW
30.57 lb/bhp
fuel consumption
Fuel consumption
universal consumption (calculated from the above)
litres/100km
km/litre
UK MPG
US MPG
Carbon dioxide emissions
Carfolio Calculated CO2 ?
VED band (UK)
CO2 Effizienz (DE)
chassis
Engine position front
Engine layout longitudinal
Drive wheels rear wheel drive  
Torque split N/A
Steering
turns lock-to-lock
Turning circle
Front suspension
Rear suspension
Wheel size front 5J x 13 H2
Wheel size rear 5J x 13 H2
Tyres front 165 SR 13
Tyres rear 165 SR 13
Brakes F/R Di/Dr-S
Front brake diameter 255 mm
Rear brake diameter 250 mm
Braked area
Gearbox 4
Top gear ratio 1
Final drive ratio 4.10
general
Carfolio.com ID56287
Production total
Model code
Model family E21
RAC rating 17.5
Insurance classification No information available
Tax band No information available
1981 BMW 315 added before December 1995.
Last modified 2013-06-19.