Specifications
BMW 3/15 Ps (Da 2 & Da 4)
Date of manufacture
1929 – 1932
Bodywork type(s)
Saloon, Tourer, Sports 2-Seater, Cabriolet and Van
Engine
Type Inline 4 cylinder
Capacity 748cc
Bore x stroke 56mm x 76mm
Power 15bhp @3000rpm
Compression 5.6:1
Carburettors 1, Solex 26 mm updraught
Valve design Sidevalve
Valve gear Camshaft drive with spur gear wheels
Electrics 6 volt
Transmission
Clutch Dry single disc
Gearbox ratios 1st 3.25:1
2nd 1.82:1
3rd 1.00:1
Axle ratio 5.35
Synchromesh None
Chassis
Frame “A” shaped frame with ‘U’ section side members, friction dampers
Suspension Front: Beam axle & 1 transverse leaf spring;
(DA 4: leaf spring only), Friction dampers
Rear: Quarter outrigger leaf springs
Steering Worm
Brakes Cable to rear wheels only
Handbrake: cable to front wheels
Dimensions
Wheelbase 1905mm
Track front/rear 1000mm/1030mm
Length/width 2800mm x 1170mm
Tyres 26 x 3.50in
General
Fuel capacity 20 litre
Max speed 47 mph
Number produced 9308 ( plus 100 “converted” orig. AUSTIN 7´s )
Club Mailing Address
BMW Historic Motor Club
Lower Norgrove,
Yarrington Road,
Alfrick,
Worcestershire.
WR6 5EX