Structural features

L50: Two staged cylinders in W-arrangement with onethrow
crankshaft, single acting trunk pistons
L80II: Two staged, opposed cylinder type with fourthrow
crankshaft, single acting trunk pistons
1st stage: 2 cylinders (L50), 3 cylinders (L80II)
2nd stage: 1 cylinder

Valves

Combined suction and pressure valves in both stages

Air cooling

By radial fan directly driven by the crankshaft

Intercooler and aftercooler

Finned pipes

Force feed lubrication

Gear pump driven by the crankshaft by means of gear wheel
Oil pressure control by means of pressure gauge and
pressure switch
Oil level inspection glass
Crankcase venting from oil filler to air suction filter

Bearings

Crankshaft: Slide bearings
Connecting rod: Slide bearings
Wrist pin 1st stage: Slide bearing
Wrist pin 2nd stage: Needle bearing