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Aircraft Leaning Techniques

Aircraft Leaning Techniques. Bill Seith Naperville Flying Club May 5, 2005. The Four Stroke Engine Cycle. A Big Air Pump INTAKE Fresh Air and Fuel COMPRESS Fuel and Air IGNITE Fuel and Air COMBUST Fuel and Air EXHAUST Spent Gases Let’s All Count To Four. Controlling the Flow.

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Aircraft Leaning Techniques

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  1. Aircraft Leaning Techniques Bill Seith Naperville Flying Club May 5, 2005

  2. The Four Stroke Engine Cycle • A Big Air Pump • INTAKE Fresh Air and Fuel • COMPRESS Fuel and Air • IGNITE Fuel and Air • COMBUST Fuel and Air • EXHAUST Spent Gases • Let’s All Count To Four

  3. Controlling the Flow • Throttle Body • Intake Manifold • Cylinder Head • Intake and Exhaust Ports • Intake and Exhaust Valves • Camshaft • Exhaust Manifold

  4. I Need An Injection • Fuel Tank • Fuel Pump • Fuel Lines • Carburetor • Fuel Injectors

  5. A Shocking Experience • Magnetos • Spark Plug Wires • Spark Plug

  6. I’m Overheated • Internal Friction • Burning Fuel • 1400 Degree Exhaust Gases • Equals A Bunch of HEAT

  7. Cooling the Beast • Engine Oil to Reduce Friction • Cooling Fins and Ductwork to Remove Heat

  8. Air Fuel Ratios

  9. Exhaust Gas Temp

  10. Cylinder Head Temp

  11. Timing is Everything

  12. Peaking Too Early

  13. Graphing It Out

  14. Rich or Lean?

  15. Rich of Peak

  16. Lean of Peak

  17. Let’s Melt Some Aluminum

  18. Focus On CHT

  19. Recommendations • Lean during climb in all Club planes • Non-GEM—Lean to engine roughness then enrich to smooth operation • GEM Equipped—Lean to peak EGT then to 50o F LEAN of peak on LAST cylinder • GEM Equipped—Monitor CHT and keep at or below 400o

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