Lab 2 Recip Engines
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Western Michigan University *
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Mechanical Engineering
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Apr 3, 2024
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Jordy Keurntjes
AVS1235
Project #2§
Aircraft Reciprocating Engines
Purpose:
Become familiar with and be able to identify the components of an aircraft reciprocating engine. Describe the functions of aircraft reciprocating engine components including cylinders, valve train, crankcase, and crankshaft. Understand the operating principles of reciprocating engines.
References:
https://www.faa.gov/regulations_policies/handbooks_manuals/aviation/
amt_powerplant_handbook.pdf
Internet
Activities:
Part 1: Use the Lycoming engine cutaway to identify the following parts.
D
Crankcase
B
Cylinder
A
Propeller Flange
K
Piston
G
Piston Pin
J
Connecting Rod
F
Pushrod
C
Lifter E
Camshaft
I
Oil Sump
H
Oil Dipstick
Jordy Keurntjes
Part 2: Identify the engine components on your table and describe their function in the engine.
A)
Connecting rod An essential part of any reciprocating engine, particularly those used in aircraft, is the
connecting rod. Its main purpose is to join the piston and crankshaft. The connecting rod converts the linear motion of the piston's up-and-down movements within the cylinder caused by combustion into rotary motion at the crankshaft.
B) Piston
A cylindrical part that travels up and down inside the engine cylinder is called the piston. Its main purpose is to transform the mechanical motion produced by fuel combustion into pressure.
C)
Pushing rod Some internal combustion engines, especially those with an overhead valve (OHV) design, contain a pushrod as a component. It oversees transferring motion from the engine block's camshaft to regulate the engine's valves' opening and closing.
D) Lifter An internal combustion engine part that is essential to the valvetrain system is called a lifter, sometimes referred to as a hydraulic lifter or a valve lifter. Its principal job is to transmit motion from the camshaft to the pushrods or to the valve directly, causing the engine's valves to open and close.
E)
Spark Plug
An internal combustion engine's ignition system depends heavily on the spark plug. Its main job is to provide an electric spark that ignites the engine's combustion chamber's air-fuel mixture.
F)
Rocker arm
One part of an internal combustion engine's valvetrain is the rocker arm. Its main job is to transfer motion from the camshaft to the engine's valves, making it easier for the valves to open and close when the engine is running.
Jordy Keurntjes
Part 3: Identify the parts of an aircraft engine cylinder.
B
Cooling Fins
D
Exhaust Valve
G
Intake Valve
E
Valve Spring
C
Intake Port
F
Exhaust Port
A
Spark Plug Boss
H
Cylinder Barrel
Part 4: Identify the components of the camshaft.
C
Camshaft Journal
A
Timing Gear
B
Camshaft Lobe
Questions:
1.
How many Valves are contained in a four cylinder horizontally opposed four stroke piston aircraft engine?
A. 8
2.
Which of the following components are included in the valve timing assembly?
A.
Camshaft, lifter, pushrod, rocker arm, valve, valve springs
3.
The Otto cycle for reciprocating engines is a 4 stroke, 5 event cycle.
4.
The amount of power the engine delivers to the propeller is:
A.
Brake Horsepower
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Propeller efficiency
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Tintake
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RPM
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Y
R
Ср
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46.1 MJ/kg
1.4
288 J/kg. K
1008 J/kg. K
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