Austro-Daimler 6

Austro-Daimler
A 147 kW (197 hp) Austro-Daimler fitted to an Aviatik D.I, on display at the Vienna Technical Museum
Type	6-cyl. water-cooled in-line piston engine
National origin	Austria
Manufacturer	Austro-Daimler
First run	1910

The Austro-Daimler 6 was a series of Austrian six-cylinder water-cooled inline SOHC-camshaft aero engines first produced in 1910 by the Austro-Daimler company.

The first Austro-Daimler six-cylinder engine was designed by Dr-Ing Ferdinand Porsche to be an aircraft engine from the outset. Of high quality manufacture the Austro-Daimler was modestly rated at relatively low rpm, which gave the engine family a reputation for robustness and reliability.

Features of the Austro-Daimler included welded steel water jackets, (originally copper), seven main bearings and large diameter inclined inlet and exhaust valves opened by dual action push-pull rods and closed by spring pressure. The single-overhead cam valvetrain was driven from the crankshaft through the usual vertically-oriented shaft as the contemporary Mercedes D.III was, but the Austro-Daimler had its vertical camshaft drive system mounted at the front of the engine instead, and not the usual aft-end placement of other Central Powers straight-six "SOHC" liquid-cooled aircraft powerplants, like the Mercedes and BMW designs.

The Austro-Daimler inspired many imitators such as the Mercedes D.II, Benz Bz.IV, Beardmore, and Hiero 6. Modest availability of the Austro-Daimler engines forced some aircraft manufacturers to substitute Mercedes (the German Daimler company) engines in their aircraft, due to greater availability.

Data from:

...
Wikipedia