Here to ease your confusion, Chip to the rescue!
The GDI engine has upright straight intake ports (USIP) rather than horizontal intake ports used in conventional MPI engines. In a GDI engine, the fuel tumble is anti-clockwise as opposed to clockwise in a MPI engine. This is because the fuel is injected directly into the cylinder in a GDI engine. In an MPI engine, the fuel goes into a port first then is pulled into the cylinder on the intake stroke of the piston. Also, GDI engines have a curved top piston, which results in better compression, and the injectors shoot the fuel into the cylinder in a curved pattern rather than a straight spray in MPI systems.
Now go write your book report Peter.
Chip
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