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Concerning the idle port area which among the following decreases by screwing the idle screw?

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in Automotive Engine Design by (137k points)
Concerning the idle port area which among the following decreases by screwing the idle screw?

(a) Pressure

(b) Clearance

(c) Engine speed

(d) Air – fuel

The question was posed to me in an interview for internship.

My question is from Petrol Engine Fuel Supply System in division Petrol Engine Fuel Supply System of Automotive Engine Design

1 Answer

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Best answer
Correct choice is (c) Engine speed

To elaborate: Screwing the idle screw in the same direction decreases the idle port area and hence decreases the engine speed. Generally, this is done by screwing -in completely and then opening back by one or two turns.

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