Motorcycle Exhaust Back Pressure

The low-speed routing shown here is.

Motorcycle exhaust back pressure. If you want to learn go on down to your local library and check out an older book titled The Scientific Design of Exhaust and Intake Systems. Each of the two cylinders has TWO spark plugs. Given that exhaust pipes are pretty smooth and that we cant change the.

However a little back pressure is a good thing. In fact it helps. Wasting fuel and increasing pollution and.

On most vehicles the exhaust systems sole job is to lead gases out of the engine. Back pressure at its most extreme form can lead to reversion of the exhaust stream - that is to say the exhaust will flow backwards which iser. For slip ons you might notice a crispier throttle response since the muffler is less restrictive so theres a bit less back pressure.

When this cool air hit the hot exhaust valves it can warp the valves. The exhaust valve in the latest Yamaha YZF-R1 not only regulates back pressure but it actually reroutes exhaust flow based on engine speed and load. Its pretty obvious that the engine has to produce this pressure differential so the less power it has to spend making pressure to push the exhaust out the more power it can send to the wheels.

To set up optimal exhaust system you need take into account your engines power band its maximum usable RPM as well as back pressure. Due to EPA regulations often times getting your bike to sound like a Harley means you need to make it louder. A common belief is that by reducing back pressure in the exhaust system you will automatically gain horsepower.

In an exhaust system that pressure drop is what we refer to as back pressure. Too short of exhaust. That back pressure you may or may not believe in can in fact push gases back into the cylinder.