Benz Bz.IV

Bz.IV
Benz Bz.IV
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.

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

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