Power Augmentaion

Question 1

Turbo charger

Answer 1

Pre compresses air before the inlet manifold

Uses exhaust gas energy to power turbine which drives the compressor

Improves thermal efficiency and volumetric efficiency

Question 2

Altitude boosted systems

Answer 2

Designed to maintain MSL pressure

Question 3

Ground boosted systems

Answer 3

Raises MAP above MSL pressure

Question 4

Waste gate

Answer 4

Prevents MAP r/y and regulates the exhaust gas going through the turbine

Control of this gives control of engine boost

Question 5

Critical alt - turbochargers

Answer 5

Altitude at which the waste gate is fully closed and turbocharger RPM is at a max

Any increase in alt will lead to reduced turbo RPM

BHP rapidly decreases when climbing above this alt

Question 6

Over boost relief valve

Answer 6

Prevents boost reaching a level that would cause structural damage

Question 7

Supercharger

Answer 7

Same impeller design

Drives compressor from the crankshaft and BHP from the engine

Can be used to compress air and fuel

Power output increases as the exhaust back pressure reduces

Question 8

Intercooler

Answer 8

Used to cool the pressurised inlet air

Reduces the chances of detonation

Mainly used in turbo due to heat transfer but may be used in super to raise the temp

Secondary effect - charge density is increased

Question 9

Changing engine power - pilot actions

Answer 9

Increase - richer mixture (reduces temp), increase RPM (reduces load), increase MAP

Decrease - decrease MAP, RPM and adjust mixture