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de Havilland Cirrus ACE Cirrus
 American Cirrus Engines Inc American Cirrus
In 1925 Geoffrey de Havilland was looking for a reliable cheap engine for use in a light sports aircraft. Halford gave it to him by building a four-cylinder crankcase and adding to it half of the air-cooled V8 240 hp (180 kW) Renault 8G's cylinders, several other of the Renault’s components, and standard parts used in car engines.
The result was a 60 hp (45 kW) in-line aircraft engine that, although it fell short of the promised horse-power, was still superior to all contemporary engines for light aircraft. It was a true aircraft engine at a time where its competitors were more often than not motorcycle engines adapted to running at high altitude. The engine secured, de Havilland Aircraft commenced manufacture of the D.H.60 Moth and the combination of reliable powerplant - the ADC Cirrus - and reliable training craft – the Moth - marked the start of serious sports flying in Britain.
American Cirrus
Type: 4 cylinder in line, vertical air cooled
Rating 5.1 compression: 90 hp at 1900 rpm
Rating 5.1 compression: 95 hp at 2100 rpm
Rating 5.4 compression: 93 hp at 1900 rpm
Rating 5.4 compression: 98 hp at 2100 rpm
Displacement: 310 cu.in
Compression ratio: 5.1-1 to 5.4-1
Bore: 4 3/8 in
Stroke: 5 1/8 in
Length: 38 1/2 in
Height: 36 3/8 in
Width: 18 3/4 in
Weight: 275 lb
Fuel consumption: not more than .54 lb/hp/hr
Oil consumption: not more than .0213 lb/hp/hr
Lubrication: Force feed, wet sump
Ignition: 2 Scintilla magnetos
Carburation: Stromberg
Spark plugs: 2 pr cylinder B.G. and AC
Price: $1600
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