Presentation on theme: "Define Carburation In an internal combustion engine, the process of producing a mixture of air and fuel in the correct proportion for engine combustion."— Presentation transcript:
1 Define CarburationIn an internal combustion engine, the process of producing a mixture of air and fuel in the correct proportion for engine combustion is called carburation.
2 Air-Fuel RatioFuel alone cannot burn. It must be combined with the oxygen in air to form a combustible mixture. The perfect balanced air to fuel ratio by mass is 14.7 to 1. This is 14.7 parts of air to one part of fuel. At this ratio under ideal conditions all of the fuel and oxygen will be consumed by combustion. This is called a stoichemetric ratio
6 What is a carburetor?Carburetor is the part of a gasoline engine which provides the mixture of gasoline and air that the engine burns.The carburetor mixes gasoline with about 15 times its weight in air for the engine to run smoothly at all speeds.A driver controls the engine speed by increasing or reduction the flow of the fuel mixture.
12 The Simple Carburettor Petrol Operation of the Venturi The Float ChamberPetrolOperation of the VenturiChoke Valve closedThe Throttle Valve controls the amount of air fuel mixture entering the engine and therefore engine powerThe Choke Valve is used to provide a rich air/fuel ratio for cold starting