125 hp 6 cylinder Timm O.W.T. engine

Used on the 1918 Otto Timm Trainer biplane

Engine discription from Aerial Age Weekly, May 19, 1919

The O. W. T. engine is a six-cylinder radial type air-cooled. rated 125 H. P. at 1475 R.P.M. Bore 5", stroke, 6". The weight, complete ready to run is 325 lbs. Cylinders are machined from solid steel forgings. Cylinder heads are of semi-steel castings, and are screwed and welded into the cylinders. Each cylinder is attached to the crankcase by means of 8 studs. Pistons are of cast iron for strength and cooling on each piston. The heads are flat, and well webed. Three double seal rings are used. A double throw counterbalanced crankshaft of chrome nickel steel is used. Connecting rods of chrome nickel steel. They are round, of constant section, and hollowed for lightness. They are machined all over. Bearings of bronze, babbit lined with steel retainers. Wrist pins of nickel steel and float in the rods. One cam shaft with two cams operate all the valves. The push rods have ball and socket ends, and are adjustable. Valves are of tungsten steel. Two exhaust valves 1 15/16" in diameter and one intake valve 2 1/8" in diameter to each cyl. Two magnetoes and a 2" Miller carburetors are used. A special type of oil distributor working under a constant pressure of 20 to 40 pounds, and timed with the pistons supplies the engine with the correct amount of oil at all speeds.