BMW IV
The BMW IV was a liquid-cooled six-cylinder in-line engine with 22.9 liters, which was built as an aircraft engine in 1918 by the German manufacturer BMW. He was an evolution of the BMW IIIa ( Displacement 19.1 L).
Under the name of Junkers L 5, the motor was manufactured under license as from 1925 by the Junkers engine GmbH.
Construction
It is a water-cooled six-cylinder in-line engine. The crankcase of an aluminum alloy is divided horizontally. The crankshaft is made of cast iron, as the crankshaft bearings are seven plain bearings are used. The cast iron cylinders are arranged individually on the crankcase and have welded coats made of sheet steel for water cooling. The pistons have three piston rings. The overhead camshaft ( OHC valve timing ) is driven by a vertical shaft. The hanging valves are actuated by roller rocker arms.
For the mixture formation, a single BMW ensures "ups " carburetor. The Doppelzündanlage ( two spark plugs per cylinder ) consists of two Bosch magnetos. The firing order is: 1-5-3-6-2-4. The Pressure lubrication is maintained with a piston oil pump. A cooling water pump to circulate the coolant.
Use
BMW IV was used in a number of planes as a drive. In particular, it was also used for prototypes and record flights are used.
- Heinkel HD 24
- Junkers A 35
- Rohrbach Ro VIII