The Fundamentals of a Car Exhaust System

Posted on June 18, 2013 at 10:10 AM

A vehicle’s exhaust system has three vital functions:fist, to move the used combustion gases away and out from the engine; second isto ensure that the surrounding engine parts are in good shape; and lastly, tohelp the mufflers minimise the engine’s noise. Because of these essentialfunctions, car engineers and manufacturers exert all efforts to make theexhaust system as efficient as possible.

The exhaust system is composed of the following parts:down pipe, manifold, lambda sensors, catalytic converter, intermediate silence,front silencer, rear silencer, tail pipe and mounting kit with its components.The exhaust manifold conducts gases starting from the engine’s combustionchambers to the exhaust pipe. It is usually made of cast iron, and has metalcurving or pipe bends in the exhaust flow. The resonator is the part which isconsidered to be a replica of the muffler, and is a straight series of pipesmade with sound muffling materials. The converter lessens harmful emissionsfrom the engine exhaust. And the exhaust pipe connects all the system parts,making it fundamental for the whole system’s success.

During the 1990s, improved technological advancementsmade it possible to construct an exhaust pipe that can unify two branches ofpipes to create an exhaust flow in one direction instead of using a balancepipe to connect at a severe 90 degree angle. Currently, X-pipes aremanufactured for popular performance cars, usually off-road versions minuscatalytic converters, but you can also find them in legal models fully equippedwith proper emissions equipment. Various tests have shown that for multiple cylinderengines, the X-pipe outperforms standard exhaust systems especially as rpmincreases, providing both better torque and power. Unified exhaust pipes workmost efficiently with multiple cylinders because of the scavenging effect. Aninstance of this is in exhaust X-pipes wherein the almost seamless connectionbetween the two exhaust pipes allows sequential firing cylinders to salvage anyspent exhaust gases from the combustion chamber more efficiently and createsmore room in the cylinder for a fresh intake of undiluted fuel and air. Withtwo exhaust pipes, as the velocity in one header tube increases, the pressurein the adjacent tube is lowered causing the exhaust to be sucked out of thatcylinder. X-pipes are simply better at doing the job especially at a muchhigher speed.

Currently, some modern vehicles use high-performanceexhaust systems equipped with one or two mufflers and tailpipes known ascat-back exhaust or dual exhaust system. This kind is better as the vehicle’sbreathing capacity is enhanced – leading to better horsepower production. Somevehicles also have added piping and pipe tube bending, tailpipes and mufflers,that helps the exhaust to flow easier without restraint as it also augments thevehicle’s driving ability and lessens back pressure.

And because of these various functions, it is right toconclude that a proper and efficient exhaust system is essential for any kindof vehicle.

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