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Generating torque for the wheels is the role of the engine. Torque is the rotational motion translated from the linear (the back and forth motion) of the pistons. The crankshaft translates this linear motion then the rotational motion is transmitted by the flywheel to the clutch. If the clutch is engaged, it transfers the torque to the transmission shaft and driveshaft. Differential gears in the axle assembly then regulate and modify the amount of torque that the wheels will deliver. The amount of torque produced by the engine, on the other hand is directly dependent on the amount of power generated by the engine strokes. The power from the engine strokes can greatly be affected by backpressure.
Basically, a combustion engine undergoes a cycle of four strokes. This cycle is known as the Otto cycle, named in honor of the German engineer Nicolaus Otto who conceptualized the process. Ideally, the cycle is consists of compression, heat addition at constant volume, expansion and release of heat at constant volume.
In terms of actual piston strokes, the cycle is consists of the following: the intake or induction stroke, the compression stroke, the power or combustion stroke and the exhaust stroke. Backpressure occurs during the exhaust stroke. Back pressure also consumes power rather than generating it. It is the function of headers like the DC Sports 3-Into-1 V6 Headers to eliminate or at least minimize the backpressure during exhaust stroke.
Back pressure occurs when there is significant amount of exhaust gases left inside the combustion chamber after the exhaust stroke. Hence, a residual resistance is created. The pistons cannot effectively deliver power strokes if there is any resistance. This resistance is due to the inability of the exhaust gases to totally vacate the combustion chambers due to lack of exhaust space. Headers like the DC Sports 3-Into-1 V6 Headers allow exhaust gases to escape more freely by providing ample space and redirecting the flow of the exhaust gases from the V6 engine.