The BMW 320 was a saloon car manufactured by BMW from 1937 to 1938. It replaced the 319-based BMW 329.
The 320 was built on a shortened BMW 326 frame and used a 326 engine with a single carburettor and an output of 45 hp (34 kW).
The suspension, which was carried over from the 329, consisted of an independent front suspension with a high-mounted transverse
leaf spring acting as upper control arms and a conventional live axle on semi-elliptic springs at the rear.
The 320 was replaced by the BMW 321 in 1938.
(taken from autogallery.org.ru)
The 320 and 321 The 4-door 326 took BMW into new territory, but many customers
still wanted a cheap 2-door saloon. So BMW developed the 320 for them. The 320
was announced a year after the 326. It had a shortened 326 chassis and benefited
from the latest BMW family styling. However, front and rear suspension were from
the old 319 and the engine was detuned. The 320 lasted until 1938 and was
replaced by the 321. Essentially the same car, the 321 came with improved
326-type front suspension and a restyled rear end derived from the big 335.
There was also a sports cabriolet. The 321 was never made in large quantities.
The war restricted material supplies soon after its introduction and production
stopped in 1941.
Years of production: 1937 - 1938
Overall production: 4185 units
4x2 4-5 seat, 2-door 4-light limousine, cabriolet B
Engine: BMW 320/45 - 45hp/3750rpm, 6-cyl 4-stroke OHV, 1971cc
Length: 4500mm, width: 1600mm, height: 1600mm
Wheelbase: 2750mm, clearance: 200mm
Front wheel track: 1160mm; toe-in: 0-2mm; camber: 1o30' - 2o;
caster: 2 - 3o
Rear track: 1300mm
Turning radius: 6.5m
Bore/Stroke: 66/96 mm
Pistons type and material: MEC, aluminium alloy LegEC-124
Cold clearance between tappet and valve stem: intake - 0.3mm, exhaust - 0.3mm
Compression ratio: 6:1
Carburettor: Solex 30 BELV
Dimensions: diffusor - 23mm; main jet - 112.5/58 in conditional units; idling
jet - 0.45mm, starter mechanism jet - 160 in conditional units
Ignition system: battery (Bosch, 6V), battery capacity - 77 A*h
Interrupter-distributor type: VF6/BR-322; contact clearance: 0.4 mm, rotor turns
Generator type and power: RG90/6 1500RST
Starter type and power: BCG0.5/6 RS28; 0.5hp
Spark plugs type: DM175/1; 18mm; electrode clearance: 0.6 - 0.7 mm
Cylinder firing order: 1-5-3-6-2-4
Clutch: dry single plate
Clutch pedal clearance: 20-30mm
Gearbox (by Hurt or Zahnradfabrik): 4 speeds
Ratios: I - 3.70, II - 2.21, III - 1.57, IV - 1, rear - 3.70
Differential ratio: ?, bevel gear with spiral tooth
Front suspension: independent
Rear suspension: whole axis on torsion shafrs or on 2 longitudinal
Hydraulical all-wheels shoe brakes
Normal flexure of ventilator belt: 20mm
Maximal speed: 115 km/h
Climb: 40 degrees
Tyres: 5.50-16 inches
Tyre pressures (atmospheres): front - 1.8, rear - 2.0
Fuel capacity: 50 L
Fuel consumption: 9.5 L/100km
Cooling system capacity: 7.5 L
Oil carter capacity: engine - 4.0 L; gearbox - 0.75 L; differential - 1.25 L
BMW-320 differs from BMW 321 by more narrow front wheel track and by another
direction of doors opening (and few other things.. - MK)