9.03 Carburetor, Mixture, and Icing References: FTGU pages 61-68

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Presentation transcript:

9.03 Carburetor, Mixture, and Icing References: FTGU pages 61-68 Aero Engines 9.03 Carburetor, Mixture, and Icing References: FTGU pages 61-68

Review This type of fuel system relies on fuel pump to keep fuel flowing to the engine. What is vapour lock? What are the 4 functions of oil? Answers: Forced-feed / fuel pump fuel system High atmospheric temperature causes gas to vaporize and block the flow of liquid fuel in the line Cooling, sealing, lubrication, flushing

9.03 Carburetor, Mixture, and Icing MTPs: Functions of the Carburetor Parts of a Carburetor Mixture Carburetor Ice

Functions of the Carburetor Carburetor is the heart of an engine. The two key functions of the carburetor are: (1) Vaporize the Fuel (2) Mix Fuel and Air

The Carburetor

Parts of the Carburetor

Carburetor Mixture Ratios Fuel-Air mixture Running mixture 1:8 Best power mixture 1:14 Chemically correct mixture 1:15 Lowest fuel consumption mixture 1:18 Leanest running mixture 1:20

Mixture Controls

Mixture Control Fuel-Air mixture Too rich a mixture may lead to: Rich: lots of fuel Lean: little fuel Too rich a mixture may lead to: Unburned fuel in exhaust (wasteful) Fouled spark plugs Rough running engine Loss of power Engine failure Too lean a mixture may lead to: Overheating Back-firing Detonation

Carburetor Ice Ice can form in the carburetor and will restrict air flow to the engine, resulting in: Loss of Power Rough Running Engine Total Engine Failure Ice can READILY form in the carburetor in CLEAR AIR with ambient air temperatures from -5 to +30 degrees Celsius, depending on the humidity of the air

Carburetor Ice

Icing – Dangerous Conditions Serious Icing - cruise or climb power Moderate Icing - cruise power or serious icing - glide power Serious Icing - glide power Light Icing – cruise or glide power

Dangerous Conditions

Carburetor Heat Use of Carb-heat and its Effects on Mixture

Confirmation What are the 2 key functions of the carburetor? What is the best power mixture ratio? Under what conditions can carburetor icing occur? Answers: Vaporize the fuel, mix fuel and air 1:14 Clear air, ambient temperatures -5 to +30 degrees celsius

Full rich…