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Q.2 Briefly explain how a variable choke carburettor works

Q.2 Briefly explain how a variable choke carburettor works

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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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.
Transcribed Image Text: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.
Transcribed Image Text: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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