What is Back Pressure?

What is Back Pressure?

With the explosions in the combustion chamber of the engine, not only the energy used to move the pistons downwards is released. At the same time, sound and heat energies are formed. The sound energy exits the combustion chamber and enters the header and moves towards the last silencer at a speed of 400-500 meters / second. Meanwhile, burnt gases enter the header at a speed of 70-100 meters / second and move towards the final silencer. Sound energy moves 5 times faster than exhaust gases. If sound energy enters a low pressure environment, it returns and encounters gases. The sound energy pushes the gases back into the combustion chamber. Meanwhile, energy loss occurs due to turbulence.

What does return exhaust gases do?

If the exhaust valve is open when the gases rotate, the combustion chamber will be filled again with some exhaust gas. This results in a smaller amount of fresh air and gasoline entering the combustion chamber. As a result, less air / gasoline mixture means less performance. If the gases turn together with sound energy, if the exhaust valve is closed, they will turn back towards the last muffler.

Sports end silencers, catalysts and headers are intended to reduce back pressure in the system.

the back pressure has to be the reason for this, when your foot is removed from the gas, the exhaust gas will return to the engine so that it makes a nice sound from the exhaust ...

I think this problem is more common in turbocharged engines because the air coming out of the engine is also responsible for freezing the turbocharger.