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This image from Lycomings leaning instructions is likely what you are looking for: The misnomer may be that leaning always increases the temperature of the engine. If you start at full rich or something above peak lean temp, leaning the engine will cause the CHT and EGT to rise until it hits its peak. If you continue to lean beyond this the temperature will ...


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I don’t have the graph you are looking for, but we can reason this out. If the mixture were 100% fuel and 0% air, it would be impossible for ignition to occur, so the temperature would be at a minimum. This explains what happens when you “flood” an engine by over-priming. If the mixture were 100% air and 0% fuel, there is nothing to ignite. This is what ...


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