Published at Wednesday, February 21st 2018, 03:31:43 AM by . Engine Wiring
Sometimes camshaft lobes touch the rocker arm directly (as you see with overhead camshaft engines), thus opening and closing the valve. On overhead valve engines, the camshaft lobes don’t come into direct contact with the rocker arms, so pushrods or lifters are used.
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.
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