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470 - ATPL - On four-stroke piston engines, the theoretical valve and ignition settings are readjusted in order to increase the:

Question 470 - Aircraft General Knowledge - Airframe, Systems, Powerplant - ATPL - Airline Transport Pilot license

Compression ratio
Piston displacement
Overall efficiency
Engine RPM.

Training tests and timed exam simulations ATPL - Airline Transport Pilot license