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Components for an Automatic Choke

An automatic choke can be located on the carburetor of an engine, or it can be located a short distance from the carburetor and is called a "divorced" or "remote choke." The choke is important in the operation of a gasoline engine because it restricts the flow of air passing into an engine when the engine is cold; it could struggle to start with less gasoline flowing into the engine.

Automatic Choke

The automatic choke is an important part of a gasoline engine, working in tandem with the carburetor to restrict and increase the flow of air flowing into the engine. The automatic choke can be briefly described as a valve that closes to restrict the flow of air when the engine is cold. As the engine heats up, the automatic choke slowly opens the valve to allow more air to flow into the engine and reduce the amount of gasoline passing into the engine. The choke system of an engine, such as that for an automobile, is recognized as part of the transmission system.

Coil

In general, automatic chokes use a bimetallic coil to operate the choke plate valve system for increasing and reducing the amount of air passing into an engine. The bimetallic coil rotates when it is cold to close the choke plate and stop the passage of air that can mix with gasoline; this is to allow a larger amount of gasoline to arrive in the engine as required when the engine is cold. As the engine heats up, a vacuum forms that pulls the bimetallic coil back from the choke releasing the pressure and allowing more air to mix with the gasoline in the engine.

Types

Although the automatic choke system works in much the same way in integral and divorced systems, the remote automatic choke is housed in the engine manifold instead of attached to the carburetor. Remote automatic chokes use a separate choke pull off system, while integral systems use a tiny vacuum system linked to the throttle to operate a piston to open the automatic choke.

Rods

In repairing automatic choke systems the incorrect thickness of carburetor used can result in problems with the rods used to open and close a divorced system either not completely closing or opening the choke system. Where the automatic choke system is not working correctly, such as the vacuum passageway used by integral systems being clogged, the choke system may not allow the engine to start or operate effectively.