Quote:
Originally Posted by BRUTAL64
no it isn't---but...........................  |
definition for "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 passing right through the cylinders into the exhaust.
Google back pressure guage and get a thousand hits on actual test tools, google "resistance to flow" and check out some hypodermic needles. Try to find a dictionary defintion for "resistance to flow". We already had this conversation. "Resistance to flow" is the cause of the "back pressure". If the exhaust has a restriction or excessive bending that resistance will cause "back pressure" Quit being so fucking stuborn and come up with hard facts or just admit your wrong. I guess if you can't do either then just keep thinking what ever makes you feel special at the end of the day.
