What is choke in an internal combustion engine?

already exists.

Would you like to merge this question into it?

already exists as an alternate of this question.

Would you like to make it the primary and merge this question into it?

exists and is an alternate of .

The choke is used on petrol engines with carburettors, to increase the fuel to air ratio, for better starting.
It is called a 'choke' because it actually chokes off some of the air entering the carburettor and is a simple metal flap across the air intake.
By choking off some of the air, a greater vacuum is formed, which draws more fuel from the jets.
A cold engine requires slightly more petrol than a warm engine for the spark to ignite the mixture. Once warm, the engine needs less fuel in the mixture (14:1 , air:fuel)and will run rough and waste fuel if the choke is left on.

Modern engines do not have carburettors or chokes, being fuel injected.
The choke function is taken care of by a cold start program where the computer varies the quantity of fuel injected with respect to the air mass and temperatures.

Diesel engines also need a 'cold start device', but this is not a choke. As diesels are injection engines, this is taken care of by changing the fuel pump setting via a switch, or by computer control of common rail injectors.
1 person found this useful

How does an internal combustion engine work?

A 4 stroke gasoline internal combustion engine operates on a 4 stroke cycle, hence the name, "4 stroke engine". The first stroke is the intake stroke, the piston moves down th

Advantage of internal combustion engine?

The advantages of the internal combustion engine is that it is: * Cheap * High power to weight ratio * It is possible to raise the efficiency to relatively high levels

What does an internal combustion engine run on?

Internal combustion engines burn a fuel in the presence of oxygenin order to create thrust or compression (to drive an engine orturbine). The fuel can be any of the following

Types of internal combustion engines?

Engine types based on stroke : 1. Two stroke engine (in which ignition is takes place twice that is in incoming stroke and second in outgoing stroke ) 2. four stroke engine (i

Why is there incomplete combustion in an internal combustion engine?

This is because there is either more fuel to oxygen; too rich a mixture, or more oxygen to fuel; too lean a mixture. To get the mix precisely correct may be theoretically poss

What does an internal combustion engine power?

There are way too many answers for that question. Basically any machine that uses natural gas, diesel fuel, petrol (Gasoline-USA) and kerosene will be driven by an internal co

What are the uses for internal combustion engines?

Almost - 99% of - every vehicle you see on the road; . Portable pumps and generators; . Chainsaws; . Snowmobiles. . Marine engines . Thermal power plants. . Lawn movers.

How is an internal combustion engine powered?

By the heat generated when fuel and air are mixed and then ignited. (set fire to) Inside an internal combustion engine there are pistons that go up and down (like your legs

Why is diesel is an internal combustion engine?

When air is compressed it becomes hot. A diesel engine compresses air and fuel in a cylinder. The mixture burns and pushes down the piston. It is called an internal combustion