A piston is a cylindrical plunger that moves within a metal cylinder through the four strokes of the engine cycle: intake, compression, power and exhaust. While their motion is predicated on other engine parts and the mixture of air and fuel, the motion of a piston is central to the functioning of an engine.Continue Reading
The following process describes how a piston works in a standard four-stroke engine. During the intake stroke, the piston is pulled down by the crankshaft. While this is happening, the inlet valve opens and allows fuel and air to mix. For the compression stroke that follows, the inlet valve closes and the piston moves back up the cylinder to compress the mixture of fuel and air. During the power stroke, the spark plug ignites the fuel and air mixture, which pushes the piston back down. For the final phase, the exhaust stroke, the outlet valve opens. Powered by the crankshaft, the piston is pushed back up the cylinder. This forces exhaust gases out the outlet pipe.
Piston rings are essential to the functioning of a piston, as they provide a seal between the piston and the cylinder to facilitate better motion. These parts also prevent leaking between the compression and sump compartments.Learn more about Motion & Mechanics
The components needed for an engine replacement include the bearings, camshaft, lifters, pistons and piston rings. Other necessary components for engine replacement are cam drives, engine valves, timing belts and chains. Replacement parts must suit the user's make and model car.Full Answer >
Jake brakes work by opening the exhaust valve at the end of a diesel engine’s compression stroke to vent the compressed air through the exhaust so it does not cause a rebound of the piston to begin the next cycle. The system uses hydraulic pressure for opening the valves. While Jake brakes are noisy, they are effective enough to slow the vehicle on a downhill incline without use of its surface brakes.Full Answer >
A Jake brake works by opening the exhaust valves when the engine's piston reaches top dead center of the compression stroke. The engine uses its momentum and energy to compress the air, and that energy is lost to the atmosphere when the exhaust valves are opened.Full Answer >
As the piston in an engine moves down, a mixture of fuel and air gets drawn into the cylinder, which causes compression. This compression is ignited by the spark plugs, causing the exhaust valve to open to allow the burned fuel mixture to be sent to the exhaust system. An internal combustion engine needs a gasoline-to-air mixture of around 14.7 parts air to one part gasoline (by weight) in order to run efficiently.Full Answer >