Kaasutinjärjestelmien

Kaasutinjärjestelmät, often referred to as carburetors in English, are mechanical devices used in internal combustion engines to mix air and fuel in the correct proportion for combustion. They were the primary fuel delivery system for most gasoline engines before the widespread adoption of fuel injection. A carburetor works by utilizing the Venturi effect, where the fast-moving air passing through a narrow section of the carburetor creates a low-pressure area. This low pressure draws fuel from a fuel bowl through small jets into the airstream, where it atomizes and mixes. The amount of air and fuel entering the engine is controlled by a throttle valve, typically operated by the accelerator pedal or lever.

Different types of carburetors exist, including downdraft, updraft, and sidedraft designs, each suited for specific engine configurations and applications. Simple carburetors have basic components like the float bowl, main jet, idle jet, and throttle. More complex designs incorporate features like accelerator pumps for improved throttle response, choke mechanisms for cold starting, and power enrichment circuits for high-load conditions. The precise calibration of carburetor jets and passages is crucial for optimal engine performance, fuel efficiency, and emissions control. While largely replaced by more sophisticated electronic fuel injection systems in modern vehicles due to their superior precision and adaptability, carburetors remain relevant in certain applications such as small engines (lawnmowers, chainsaws), vintage vehicles, and some performance or motorsport contexts.