Powerplant - AM.III.A.K2 - Reciprocating engine operating principles/theory of operation

Question 1

In what position should the crankshaft be when a magneto is being timed 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 BTDC

Question 2

What is checked on a reciprocating engine runup to determine the operational condition of the engine? (9 total)

Answer 2

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