Lubrication And Cooling System

Question 1

Engine lubrication systems.

Answer 1

Lubricated with oil.
Oil clings to the surface.
Also:
Cleans engines internals,
Cool engines intervals controlling expansion,
Perform hydraulic functions (operating valances and propeller pitch).

Question 2

Aero engine oil.

Answer 2

Mineral oil - single grade(W10).
Synthetic oil - multigrade (10w50), 10 when cold 50 when hot.
Compound oil - controls viscosity.

Question 3

Dry sump.

Answer 3

Used in Aerobatics.
High altitude operations.
Dedicated oil resivoir and scavenge pump.
Image in files, 24 and 25 (schematic).

Lubricant stored in a special tank, then moved via a pump.

Question 4

Wet sump.

Answer 4

Standard aerosystem.
No resivoir, oil is stored in sump.
Image in files, 26 (schematic).

crankcase sump is used as an integral oil reservoir.

Question 5

Liquid cooling.

Answer 5

Uses water or antifreeze.
Pressurised to 15psi.
Operating temp 88-92 degrees.

Image in files,27

Question 6

Air cooling.

Answer 6

Air enters through RAM/cabin air inlet.
Air flows across the engine.
Reduces engine performance.
Baffles control the flow of air across and down.
Cowl flap can open/close to regulate airflow into engine.

Image in files, 28

Question 8

At what rpm is there a risk of over oiling?

Answer 8

High.

Question 9

What is thermal shock?

Answer 9

Excessive cooling can occur at low rpms and high airspeed.

Question 10

What system uses splash lubrication?

Answer 10

Wet sump.