General Aircraft Technical Knowledge Practice Test 2026 - Free Aircraft Technical Knowledge Practice Questions and Study Guide

Diesel combustion relies on the heat already generated by compressing air to ignite the injected fuel. In normal operation the in-cylinder gas temperatures during the combustion process are typically around 700–900 C. This range is high enough to ensure reliable auto-ignition and rapid burning, yet representative of the average flame temperatures seen in most diesel engines. Local hotspots can be hotter, but the overall combustion temperature commonly falls in this band. The other ranges either fall short of the temperature needed for stable diesel ignition (400–600 C), or describe conditions that are hotter than usual (800–1000 C and 1000–1200 C) for the average combustion event.