Reciprocating Engines in high-powered reciprocating aircraft engines? a. The outer race of a single-row, self-aligning ball bearing will always have a radius equal to the radius of the balls. b. There is less rolling friction when ball bearings are used than when roller bearings are employed. c. Radial and inverted engines have some cylinders below the crankcase, and when the engine is idle, oil will leak from the crankcase, past the piston rings, and fill the combustion chamber. This condition is called a hydraulic lock. If this oil is not remov