What is the use of the additional hole present in a pintaux nozzle?(a) For self-cleaning(b) High-pressure relief(c) It injects a small amount of fuel(d) For temperature controlThis question was addressed to me in an interview for internship.The origin of the question is Diesel Engine Fuel Supply System in chapter Diesel Engine Fuel Supply System of Automotive Engine Design

What is the use of the additional hole present in a pintaux nozzle?(a)

1.	What is the use of the additional hole present in a pintaux nozzle?(a) For self-cleaning(b) High-pressure relief(c) It injects a small amount of fuel(d) For temperature controlThis question was addressed to me in an interview for internship.The origin of the question is Diesel Engine Fuel Supply System in chapter Diesel Engine Fuel Supply System of Automotive Engine Design
Answer» Right choice is (c) It injects a small amount of fuel To explain I would SAY: The function of the auxiliary hole drilled in the nozzle BODY is to INJECT a small amount of fuel through its addition hole which is CALLED a pilot injection in an UPSTREAM direction slightly before the main injection.

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