There is an O-360-J2A engine with ma-4spa carburetor. If you have them on a plane like Cessna, and if you are going to take-off from an airfield placed at 9000 - it is OK to lean (ma-4spa carburetor are not to be leaned before 5000 feet) because the plane accelerates quickly and you will not overheat it most likely - the airstream helps a lot, there is some air cooling. Those engines use fuel not to overheat the engine, like a cooling liquid. Can you accelerate the G2 to the safe for temperature limitations airspeed, where the air is cooling effectively - quick enough? What if you need full power for emergency? Leaning the engine is not always simple - you have to do it slowly at cruise or full open throttle settings. Lean to peak temp and then rich to 50-100 degrees rich of peak on EGT gauge if you have it. In the simulator you can do whatever you want. However there is a reason they do not lean in their real flights.
1 Like