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Where is the injector placed in the direct injection system?

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in Automotive Engine Design by (137k points)
Where is the injector placed in the direct injection system?

(a) Intake manifold

(b) Next to the inlet valve

(c) Inside the cylinder

(d) Near the throttle body

I had been asked this question during a job interview.

The query is from Petrol Injection in chapter Petrol Engine Fuel Supply System of Automotive Engine Design

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The correct option is (c) Inside the cylinder

To explain I would say: The fuel injector is placed directly into the cylinder and sprayed as per the ECU signal. The intake valve allows only the air into the combustion chamber and the fuel is sprayed – indirectly through an injector.

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