Reciprocating Engine Flashcards
Reciprocating engines have powered aircraft since the dawn of aviation and remain the dominant powerplant for general aviation. Understanding the internal components, operating cycles, and arrangement types is fundamental to the Powerplant certificate.
The FAA Powerplant exam covers the four-stroke cycle, engine components (cylinders, pistons, valves, crankshaft, camshaft), valve timing, firing order, and engine arrangements (horizontally opposed, radial, in-line). These flashcards cover the essential concepts.
What You Need to Know
- Four-stroke cycle: intake, compression, power, exhaust
- Intake valve opens: draws fuel-air mixture into the cylinder
- Compression stroke: both valves closed, piston compresses the mixture
- Power stroke: spark ignites mixture, expanding gases drive piston down
- Exhaust stroke: exhaust valve opens, piston pushes out burned gases
- Valve timing: valves open/close slightly before/after TDC/BDC for efficiency
- Firing order: sequence in which cylinders fire (e.g., 1-3-2-4 for a 4-cylinder)
- Engine types: horizontally opposed (most common), radial, in-line, V-type
Why This Topic Appears on FAA Exams
Reciprocating engine knowledge is tested because these engines power the majority of general aviation aircraft. Mechanics must understand the operating cycle to diagnose performance problems, perform timing adjustments, and identify component failures. The exam verifies you can identify components and understand their functions.
Sample Flashcards
Tap any card to reveal the answer. These are just a sample — the full deck is available inside the study platform.
What are the four strokes of a four-stroke cycle engine?
What happens during the compression stroke?
What is the most common reciprocating engine arrangement in modern light aircraft?
What is top dead center (TDC)?
Study Tips
Memorize the four strokes in order: intake, compression, power, exhaust. Know that valve timing events (opening and closing) are referenced to crankshaft position in degrees before/after TDC (top dead center) or BDC (bottom dead center). Focus on the horizontally opposed arrangement — it is the most common in modern light aircraft.
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Access the full flashcard deck for Reciprocating Engines, track your mastery, and prepare for the FAA Powerplant exam.
Related Topics
Frequently Asked Questions
A four-stroke engine completes the power cycle in two crankshaft revolutions (four strokes: intake, compression, power, exhaust). A two-stroke engine completes the cycle in one revolution (two strokes), combining intake and compression, and power and exhaust. Two-stroke engines are lighter and simpler but less fuel-efficient. Most certified aircraft engines are four-stroke.
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