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Automotive Technology: A Systems A...

6th Edition
Jack Erjavec + 1 other
ISBN: 9781133612315

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BuyFindarrow_forward

Automotive Technology: A Systems A...

6th Edition
Jack Erjavec + 1 other
ISBN: 9781133612315
Textbook Problem

Explain the major differences between port fuel injection and gasoline direct injection systems.

To determine

The difference between port fuel injection and gasoline direct injection systems.

Answer

The major distinction is the location or place where the fuel is sprayed by the fuel injector.

Explanation

Although both the port fuel injection (PFI) and gasoline direct injection (GDI) uses electronic fuel injectors, one of the most important distinctions between the two types is the location where the fuel is sprayed. The former is mounted near the head of the cylinder in the intake manifold whereas the latter is sprayed under high pressure directly into the engine cylinders for combustion. The advantage of GDI over PFI is that in case of GDI due to direct injection the combustion efficiency improve and thus reduces the fuel emissions.

Conclusion:

In case of PFI, injectors are mounted over the cylinder head in the intake manifold (at least one for each cylinder) whereas in case of GDI the fuel is directly injected or sprayed into the engine cylinder to improve the combustion.

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