BMW 3/20 — BrandWiki

BMW 3/20

Overview

BMW 3/20

manufacturer	BMW
aka	AM-1, AM-2, AM-3, AM-4
production	1932–1934
assembly	Germany: Eisenach
predecessor	BMW 3/15
successor	BMW 309
class	City car
body style	four seat saloon four seat cabriolet two seat convertible coupé
layout	FR layout
engine	788 cc OHV straight-4
transmission	4-speed manual
wheelbase	2150 mm
length	3200 mm
width	1420 mm
height	1550 mm
weight	650 kg with saloon body
designer	Alfred Böning
sp	uk

The BMW 3/20 PS was the first BMW automobile designed entirely by BMW. It was manufactured from 1932 to 1934, replacing the 3/15 model that was initially an Austin 7 manufactured under licence from the Austin Motor Company.

The engine used in the 3/20 was based on the Austin Seven engine used in the 3/15, but its crankshaft ran in plain bearings instead of roller bearings and had an 80 mm stroke, generating a displacement of 788 cc.[1] The new engine design also had a water pump and an overhead valve cylinder head. These design changes caused the engine to generate 20 hp, but did not change the taxable horsepower rating of 3 PS, thus giving the model designation 3/20.

The 3/20 was larger than the 3/15, with an 84.6 in wheelbase and a body 3 in lower than the 3/15.[2] The 3/20 used a backbone frame unrelated to the 3/15's Austin Seven "A" frame.[3][4]

References