Reciprocating Engines

Question 1

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

Answer 1

The piston in cylinder number 1 should be in the correct position for ignition to occur. This is normally about 30 degrees before top center on the compression stroke.

Question 2

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

Answer 2

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