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Basic Engine Theory
Terms in this set (12)
forms the framework for the engine cylinders and reciprocating assembly.
a cylindrically shaped object with a solid crown (top) that moves up and down in the engine's cylinders. Hot gases from the combustion of the air-fuel mixture push on the piston to do the actual work.
forms a guide for the piston to move in; allows the piston to move up and down as the engine completes its cycle
seal the piston to the cylinder and prevent combustion gases from leaking past. Oil rings prevent oil from the engine crankcase from making its way into the combustion chamber.
connects the piston to the connecting rod, and forms a pivot point for the small end of the connecting rod to move on.
connects the piston/wrist ping assembly to the engine's crankshaft. The large end of the connecting rod attaches to the crankshaft on the connecting rod journal.
converts the linear (straight line) motion of the piston into rotary motion, which can then be used to power a vehicle or drive an accessory.
located above the piston, it houses the combustion chamber, the intake and exhaust valves, and the intake and exhaust ports.
located in the cylinder head directly above the piston, it is where the actual combustion of the air-fuel mixture takes place.
Allows air-fuel mixture to be drawn into the combustion chamber. When closed, it must seal the combustion chamber from the intake port.
allows waste gases to be removed from the combustion chamber. When closed, it must seal the combustion chamber from the exhaust valve.
responsible for the opening and closing of the engine's intake and exhaust valves. The camshaft turn at one-half the speed of the engine's crankshaft.
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