Cooling System

Question 1

How are the cylinder heads cooled?

Answer 1

Liquid Cooling

Question 2

What is used for liquid cooling?

Answer 2

Water-coolant mix

Question 3

How are the cylinders cooled?

Answer 3

Ram Air Cooled

Question 4

Components of the liquid cooling system?

Answer 4

• Expansion Tank (1)
• Pressure Cap (On Expansion Tank) with relief valve and return valve (3)
• Radiator (2)
• Overflow Bottle (4)
• Engine Driven Water Pump (forces water from radiator to the cyl heads)

Question 5

How does coolant overflow work?

Answer 5

At temperature rise and expansion of the coolant, the pressure relief valve opens and the coolant will flow via a hose at atmospheric pressure to the transparent overflow bottle

Question 6

How does coolant reenter the circuit?

Answer 6

Once it is cooled, it is sucked back through the return valve to the radiator.

Question 7

Where should coolant level be?

Answer 7

2/3 if the expansion tank, between min and max level (for first flight of the day)

Question 8

How does coolant return from the overflow bottle

Answer 8

As coolant cools in the expansion tank and overflow bottle, vacuum pressure sucks it back into the circuit.

Question 9

Why is the expansion tank on the top of the engine?

Answer 9

Since the radiator is placed below the engine, all coolant expansion occurs in the expansion tank, hence the need for an overflow bottle