Thee needs of WW1 resulted in 12,600 Curtiss OX-5 engines having been produced by 1919 when production ended, after the war ended there were a large amount cheaply available on the surplus market and many found their way into civilian aircraft especially trainers, not the best place for one as it had a reputation for poor reliability, in fairness much of the engines reliability was the result of many of the contactors that produced the engine having almost non-existent quality control. One interesting design feature of the Curtiss OX-5 were the valve pushrods, these were coaxial, the inlet push rod being located inside a tubular exhaust pushrod. Curtiss OX-5 Power output: 90 hp (67 kW) at 1,400 rpm105 hp (78 kW) at 1,800 rpm for brief periodsSpecific power: 0.21 hp/in³ (9.5 kW/l)Compression ratio: 4.9:1Fuel consumption: 8.0 US gal/h (30.8 l/h) at 75% powerOil consumption: 0.5 US gal/h (1.9 l/h) at 75% powerPower-to-weight ratio: 0.27 hp/lb (440 W/kg) |