Reciprocating Engines

Question 1

In what position should the crankshaft be when a magneto is being timed to the engine?

Answer 1

The piston and cylinder number one should be in the correct position for ignition to occur. This normally is about 30° before top dead center on the compression stroke.

Question 2

What is checked on an engine run up to determine the operational condition of the engine

Answer 2

Idling RPM and manifold pressure, engine acceleration, maximum static RPM and manifold pressure, magneto drop, ignition switch, safety check, propeller pitch change, propeller feathering, oil pressure, fuel, pressure, and fuel flow