Specifications
BMW 309
Date of manufacture
1934 – 1936
Bodywork type(s)
Saloon, Cabrio-saloon, Cabriolet and Tourer
Engine
Type Inline 4 cylinder
Capacity 845cc
Bore x stroke 58mm x 80mm
Power 22 bhp @ 4000 rpm
Compression 5.6:1
Carburettors 1, Solex 26 mm up draught
Valve design Overhead, 2 per cylinder
Valve gear Camshaft in block. Rockers, tappets and springs
Electrics 6 volt
Transmission
Clutch Dry single disc (Fichtel & Sachs; K 10 with 180 mm dia.)
Gearbox ratios
Hurth
1st 4.42:1
2nd 2.54:1
3rd 1.65:1
4th 1.00:1
Axle ratio
Synchromesh
Chassis
Frame Lightweight “A”- frame with two longitudinal tubular members,
diameter varying from 90 mm to 60 mm load depending,
and three rectangular cross members
Suspension Front: Transverse leaf spring with lower wishbones
and integral single acting shock absorbers
Rear: Longitudinal leaf springs with rigid axle
and lever arm double acting shock absorbers
Foot operated one shot central oil lubrication
system
Steering Rack and pinion
Brakes Four wheel cable ( Bendix )
Handbrake, cable on rear wheels
Dimensions
Wheelbase 2400mm
Track front/rear 1153mm/1220mm
Length/width 3900mm x 1440mm
Tyres 5.25 x 16
General
Fuel capacity 35 litres
Max speed 50 mph
Number produced 6000
Club Mailing Address
BMW Historic Motor Club
Lower Norgrove,
Yarrington Road,
Alfrick,
Worcestershire.
WR6 5EX