![]() During the combustion step, the cylinder is at Top Dead Center (approximately), and both the intake and exhaust valves are closed.īurning gasoline to create temperature and pressure seems like a straight forward process, however it is actually a complicated balance of variables. The ignition’s purpose is to create temperature and pressure in the cylinder, which later drives the piston downwards during the Power Stroke. This ignition takes place during the “combustion” step shown in the Otto Diagram. In a gasoline engine, a spark plug is used to ignite a mixture of fuel (gasoline) and air. Welcome to Part 4 of the Teaching Engine Thermodynamics Series. In this edition, it’s all about FEELING THE BURN!
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