Effect
of the exhaust pipe to the exhaust gas is discharged from the engine combustion chamber, in fact, generally the more people that the exhaust gas smoothly as possible, in fact Definitely. Engine exhaust due to the working principle of the engine, the exhaust blast is discharged in waves, after we hand on the exhaust pipe can be felt. If the diameter of the exhaust pipe is small, the discharge of each blast wave will form a larger pressure in the interior of the exhaust pipe, when the blast wave emission start out in the exhaust pipe, after a wave blast will form a negative pressure, that is, we called back pressure.
The size of this back pressure determines the optimum field of engine exhaust gas, if the back pressure increases, the engine at low speed due to the effect of the blast wave front by the blast, the faster will be the front negative pressure is sucked out of the blast wave, i.e. the better the effect of the exhaust gas, but when the number of revolutions of the engine reaches a high, due to the small diameter of the exhaust pipe, due to pressure in the exhaust pipe is not drawn out only the next quickly blast wave, but it causes the discharge of each wave considerable resistance, and influence each other between each blast wave, resulting in the exhaust gas is not smooth, thus reducing the performance of the engine, at this time, use a larger diameter an exhaust pipe will play a better effect.
Advantages: low noise and good low speed torque;
Disadvantages: at a high speed exhaust gas can not be discharged quickly, the engine power output in response primer.
