STROKES OF THE ENGINE

Small aircraft spark ignition four stroke engines are the most common found.

The four stroke operating cycle is:

1. Intake – Fuel/air mixture enters the cylinder.

2. Compression –Piston moves up compressing the Fuel/air mixture.

3. Power (combustion) - Fuel/air mixture combustion from the spark plug firing.

4. Exhaust - burnt gases exiting the cylinder.

Remember:

The four stroke operating cycle is:

1. Intake

2. Compression

3. Power (combustion)

4. Exhaust

References:

Private Pilot ACS PA.I.G.K1c

PHAK (CH.7)

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