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How is the piston crown created in a direct injection to help a minimum of air and fuel before combustion?(a) Scavenged(b) Swirling vortex(c) Plain(d) CircleI had been asked this question in an international level competition.I would like to ask this question from Petrol Injection topic in section Petrol Engine Fuel Supply System of Automotive Engine Design

Answer»

The CORRECT choice is (b) SWIRLING vortex

Explanation: In a direct injection the piston crown is designed in such a way that it creates a swirling vortex to help mix the fuel and AIR before combustion. The piston crown also has a cavity on it for ultra-lean-burn CONDITIONS.



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