Curtiss R-600 Challenger
The Curtiss R-600 Challenger was a six-cylinder, double-row, air-cooled, radial engine for aircraft use built in the United States in the late 1920s. It developed 180 hp (134 kW) at 2,000 rpm.
The R-600 featured cast aluminium alloy heat treated cylinder heads screwed and shrunk onto forged steel barrels. The rocker boxes were cast integral with the cylinder heads. The crankcase was cast in two parts, splint on the centre line of the front row of cylinders. There were two Silchrome valves per cylinder, seating on bronze inserts.
The crankshaft was a two-throw counter balance tye, with two master rods each fitted with two short H section link rods. The pistons were ribbed aluminium alloy.
The carburettor is exhaust jacketed around the barrels, using a hot-spot elbow fitted with a valve to control the amount of exhaust heat admitted to the carburettor.
Accessories available at extra cost were a propeller hub, engine driven fuel pump, starter, generator, gun synchroniser, and tool kit.
Type: 6 cylinder, air cooled, staggered fixed radial
Rating: 170 hp at 1800 rpm / 180 hp (134 kW) at 2,000 rpm
Displacement: 603.4 cu in (9.89 L)
Compression ratio: 4.9-1 or 5.25 to 1
Bore: 5.125 in (130.2 mm)
Stroke: 4.875 in (123.8 mm)
Length: 42 5/32 in
Diameter: 42.625in (1082.7 mm)
Weight: 420lb (190.5 kg)
Fuel consumption: not more than .55 lb/hp/hr
Oil consumption: not more than .020 lb/hp/hr
Lubrication: Pressure and scavenging pumps
Ignition: 2 Scintilla
Carburation: Stromberg 2 barrel NA-U4-J
Spark plugs: 2 per cylinder B.G. 1XA