Q.2 Briefly explain how a variable choke carburettor worksmoving insidegenerated by the engine. The movement is proportionalto engine speed (more RPM the greater the choke area). Attached to the piston is ajet, located in the bodyConstant depression or variable choke carburettors feature aa chamber via ataperedof the carburettor.which moves in and out of a fixedopenings, the piston rises and falls depending onvariations either side of the piston. The action of the tapered needle in the fuel jetDuringallows more or less fuel tointo the passing air therefore the fuel/airremains constant for improved economy and performance at all enginespeeds. Task 8 - Induction SystemsIn order for combustion to take place an induction system is required to feed fuel and air into thecylinder of an engine. To improve efficiency and performance spark ignition (SI) engines are nowadopting compression ignition (CI) engine technology by injecting fuel directly into the cylinderjust before the point of ignition however these engines still require an air induction system.Carburettors: before fuel injection technology had been fully developed carburettors (carbs)were used to create a fuel/air ratio at different engine speeds and loads. A cold start facility wasalso fitted albeit manually operated.The demand for more performance has meant the fixed choke carb' was no longer suitable. Morecomplex carbs' were developed (twin choke) as well as variable choke (constant depression)carbs which used engine vacuum (during throttle opening) to vary the size of choke according tooperating requirements.

A carburetor is a device that aids in the mixing of fuel and air in an internal combustion engine…

Answered: Q.2 Briefly explain how a variable…

Engineering

Mechanical Engineering

Q.2 Briefly explain how a variable choke carburettor works

Automotive Technology: A Systems Approach (MindTap Course List)

6th Edition

ISBN:9781133612315

Author:Jack Erjavec, Rob Thompson

Publisher:Jack Erjavec, Rob Thompson

Chapter9: Automotive Engine Designs And Diagnosis

Section: Chapter Questions

Problem 1RQ

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Question

Q.2 Briefly explain how a variable choke carburettor works
moving inside
generated by the engine. The movement is proportional
to engine speed (more RPM the greater the choke area). Attached to the piston is a
jet, located in the body
Constant depression or variable choke carburettors feature a
a chamber via a
tapered
of the carburettor.
which moves in and out of a fixed
openings, the piston rises and falls depending on
variations either side of the piston. The action of the tapered needle in the fuel jet
During
allows more or less fuel to
into the passing air therefore the fuel/air
remains constant for improved economy and performance at all engine
speeds.

Task 8 - Induction Systems
In order for combustion to take place an induction system is required to feed fuel and air into the
cylinder of an engine. To improve efficiency and performance spark ignition (SI) engines are now
adopting compression ignition (CI) engine technology by injecting fuel directly into the cylinder
just before the point of ignition however these engines still require an air induction system.
Carburettors: before fuel injection technology had been fully developed carburettors (carbs)
were used to create a fuel/air ratio at different engine speeds and loads. A cold start facility was
also fitted albeit manually operated.
The demand for more performance has meant the fixed choke carb' was no longer suitable. More
complex carbs' were developed (twin choke) as well as variable choke (constant depression)
carbs which used engine vacuum (during throttle opening) to vary the size of choke according to
operating requirements.

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