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How exactly does one use exhaust to cool the engine? This is something I've never heard of in the context of cars of motorcycles, where exhaust is generally rem
by xyzzyz 7y ago
How exactly does one use exhaust to cool the engine? This is something I've never heard of in the context of cars of motorcycles, where exhaust is generally removed as soon as possible, and if it's used for anything, it's for running turbochargers that make the engine even hotter.
- FabHK 7y agoNot sure what GP was referring to, but they might have had in mind the practice to run engines a bit too rich, so that fuel runs through the system with insufficient oxygen to burn, ie as a liquid, which cools the engine.
- stevehawk 7y agoThere are two strategies for keeping cylinders cool in cruise: push the red mixture knob forward for a rich fuel/air mixture setting that uses unburned fuel to lower cylinder head temperatures, or pull the mixture knob out to such a lean setting that an abundance of air and reduction in engine power and heat cools the cylinders. Running aircraft engines “lean of peak” (LOP) typically reduces airspeed about 5 percent in cruise while lowering fuel consumption about 20 percent—but not all engines are capable of LOP operations, and doing it wrong can cause permanent and costly engine damage. source: https://www.aopa.org/news-and-media/all-news/2019/may/flight-training-magazine/technique-lean-of-peak https://www.aopa.org/news-and-media/all-news/2019/may/flight...