With direct fuel injection, each cylinder gets its own injector, which sprays fuel directly into the combustion chamber at just the right time to combust. With ported fuel injection, instead of spraying the fuel directly into the cylinder, it sprays into the intake manifold just outside the valve. When the valve opens, air and fuel enter the combustion chamber.
On the top of the piston, you’ll find three or four grooves cast into the metal. Inside the grooves piston rings are put in. The piston rings are the part that actually touch the walls of the cylinder. They are made from iron and come in two varieties: compression rings and oil rings. The compression rings are the top rings and they press outward on the walls of the cylinder to provide a strong seal for the combustion chamber. The oil ring is the bottom ring on a piston and it prevents oil from the crankcase from seeping into the combustion chamber. It also wipes excess oil down the cylinder walls and back into the crankcase.
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