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Which of the following part vacuum is referred to as a ported vacuum in a vacuum advance type?

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in Automotive Engine Design by (137k points)
Which of the following part vacuum is referred to as a ported vacuum in a vacuum advance type?

(a) Crankcase

(b) Engine deck

(c) Radiator

(d) Carburetor

The question was posed to me in class test.

My question is based upon Ignition Advance in division Conventional Ignition System of Automotive Engine Design

1 Answer

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Best answer
Right choice is (d) Carburetor

Easy explanation: In a vacuum advance type one side of the diaphragm is open to the atmosphere while the other side is subjected to the vacuum from the carburetor. A return spring on the vacuum side of the diaphragm keeps the advance unit at zero advance if no vacuum is applied as during idling.

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