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320/6 and 323i Engine Information

This page regroups some vital information regarding the M20 engines found in the E21 320/6 and 323i.

General 320/6 info
Engine designation: M20
Displacement: 1990cc
Bore x Stroke: 80mm x 66mm
Compression ratio: 9.2:1
Power: 90kW (122HP) at 6000rpm
Torque: 160Nm at 4000rpm
Minimum compression pressure: 10.0 bar
Fuel System: Solex 4A1 four-barrel downdraft carburettor

General 323i info
Engine designation: M20
Displacement: 2316cc
Bore x Stroke: 80mm x 76.8mm
Compression ratio: 9.5:1
Power: 105kW (143HP) at 5800rpm
Torque: 190Nm at 4600rpm
Minimum compression pressure: 10.0 bar
Fuel System: Bosch K-jetronic

M20 engine info
The M20 is a watercooled in-line six cylinder engine, with a cast iron block and light alloy head. There are two valves per cylinder, operated by a single central overhead camshaft which is belt-driven. Pistons have three rings, two for compression and one for oil control. The 320/6 and 323i have identical block and head, they are interchangeable. So are the conrods, but the pistons and crankshaft are different.

The engine is cooled by a radiator and a belt-driven fan with a clutch mechanism. On the other side of the axe on which the fan is mounted, inside the block, resides the water pump.

320/6 engine

323i engine
 

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