Benz Bz.IV (Redirected from Benz Bz.IVa)

Bz.IV
A Benz Bz.IV at the National Air and Space Museum's Udvar-Hazy Center (2017)
Type Inline piston engine
National origin Germany
Manufacturer Benz
First run c. 1916
Number built 6,400
Developed from Benz Bz.III
Developed into Benz Bz.IVa

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.

Design and development

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 a Bz.IV were the first captured aluminium pistons to be examined by the British Ministry of Munitions.

Applications

Specifications

Data from

General characteristics

  • Type: 6-cylinder, water-cooled, inline aircraft piston engine
  • Bore: 145 mm (5.7 in)
  • Stroke: 190 mm (7.5 in)
  • Displacement: 18.825 L (1,148.8 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)

Components

  • 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

Performance

See also

Related lists


This page was last updated at 2023-12-24 15:23 UTC. Update now. View original page.

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