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Model Engineering Glossary: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Carburettor

Device that mixes air and fuel in the intake system of an internal combustion engine. These are not so easy to make at a small scale.

Carburettor on a single cylinder gas engine - Dick Barnes Gas Engine

This is a very simple carburettor with a needle at the bottom that controls the amount of fuel and the throttle control at the top which rotatesa cylindrical barrel with a hole through the centre.

The needle controls the fuel flow into the spray bar that sits in the centre of the throttle opening and air flow draws the fuel.

This type of throttle is used on most glow plug engines.


Vapour Carburettor

Consists of a container of fuel (roughly half full), air is sucked in at one end at the top and out at the other end at the top - as the air is drawn in through the top it impinges on the surface of the fuel which has a tendency to splash the fuel around and so increase the surface area. The fuel vapourises and this gets mixed with the air. The result is a fuel air mixture that is drawn into the engine.

See also: Engine.

Model Engineering Glossary: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z