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Benz Bz.IV

benz-bz4


The Benz Bz.IV was a German six-cylinder, water-cooled, inline engine developed for aircraft use. Deliveries began in 1916 and some 6,400 were produced.

The Bz.IV was a dual-camshaft design, with two intake and two exhaust valves per cylinder. The cylinders were cast iron surrounded by a sheet metal cooling jacket. The crankcase was aluminium and pistons were initially steel but later versions had aluminium pistons. A high compression version of the engine (Bz IVü) was produced from 1917 onwards and can be recognised by the red bands painted on each cylinder. In February 1918, pistons from such an engine fitted to an Aviatik G.130 were the first captured aluminium pistons to be examined by the British Ministry of Munitions.

Applications:
AEG C.VI
AEG J.I
AGO C.IV
Albatros C.VII
Albatros J.I
Chitty 2 (racing car)
DFW C.V
Dobi-II
Friedrichshafen FF.49
Friedrichshafen G.II
Halberstadt C.V
Junkers J.I
LVG C.VI
NAVO RK-P4/220
Pfalz D.XII
Pfalz D.XIV
R-planes

Specifications:
Type: 6-cylinder, water-cooled, inline aircraft piston engine
Bore: 145 mm (5.7 in)
Stroke: 190 mm (7.5 in)
Displacement: 18.83 l (1,149.1 cu in)
Length: 1,990 mm (78.3 in)
Width: 530 mm (20.9 in)
Height: 1,150 mm (45.3 in)
Dry weight: 370 kg (815.7 lb)
Valvetrain: Twin inlet and exhaust valves operated by pushrod actuated double rockers
Fuel system: Two Benz 2-jet carburettors feeding three cylinders each
Fuel type: Gasoline specific gravity 0.72
Oil system: Pressure feed at 0.2 MPa (28 psi): 50% Vacuum Heavy, 50% Sternol
Cooling system: Water-cooled
Power output: 170 kW (228.0 hp) at 1,400 rpm
Specific power: 9.1 kW/l (0.2 hp/cu in)
Compression ratio: 4.91:1
Fuel consumption: 85.2 l (150 imp pt) / hour
Specific fuel consumption: 0.495 l/kW/hr (0.65 pts/hp/hour)
Oil consumption: 2.6 l (4.5 imp pt) / hour
Power-to-weight ratio: 0.3796 kW/kg (0.231 hp/lb)

 

 

 


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