Back pressure

Back pressure usually refers to the pressure exerted on a moving fluid by obstructions or tight bends in the confinement vessel along which it is moving, such as piping or air vents, against its direction of flow. For example, an automotive exhaust muffler with a particularly high number of twists, bends, turns and right angles could be described as having particularly high back pressure ^[1]. Back pressure, in the exhaust sense of the term, of a four-stroke engine is usually termed as being a "bad thing" for performance; however, in the interest of reducing exhaust sound to levels allowable by public noise ordinances, back pressure can be regulated using systems from simple butterfly valves to fully computer controlled units sensing pressure in the exhaust pipe itself.

In a two-stroke engine however, a certain amount of exhaust backpressure is needed to prevent unburned fuel/air mixture to pass right through the cylinders into the exhaust.

See also

• Exhaust pulse pressure charging
• Tuned pipe

Backpressure in information technology

The term is also used analogously in the field of information technology to describe the build-up of data behind an I/O switch if the buffers are full and incapable of receiving any more data; the transmitting device halts the sending of data packets until the buffers have been emptied and are once more capable of storing information ^[2].

References