Walter Bora

The Walter Bora was a Czechoslovakian nine-cylinder, aircooled, radial engine for powering light aircraft that was developed in the 1930s.
 
Variants:
Bora II
Direct drive engine

Bora II-R
Geared engine, reduction ratio 0.666:1

Applications:
Aero A.200
Nardi FN.305
RWD-9
SIAI-Marchetti SM.101

Specifications:
Bora II-R
Type: 9-cylinder radial piston engine
Bore: 105 mm (4.1 in)
Stroke: 120 mm (4.7 in)
Dry weight: 172 kg (379 lb)
Valvetrain: One intake and one exhaust valve per cylinder
Fuel system: Carburettor
Fuel type: Petrol
Cooling system: Air-cooled
Power output: 183 kW (245 hp) at 2,400 rpm
Compression ratio: 6.3:1
Power-to-weight ratio: 1 kW/kg (0.65 hp/lb)