I have a Kawasaki ZX10R 2009 and i ride it without exhaust and i want to know if it is in some matter bad for the bike and is it better or worse for the performance? What is the difference between a open racing exhaust and just removing the exhaust? Thank you in advance.
There are two types of exhausts that people use in drag racing. 1. Open exhaust. 2. Tuned exhaust. No exhaust will actually hurt performance. It all has to do with the exhaust pulse. As the exhaust gases are exiting an open exhaust they will cause a vacuum. At the moment the exhaust pulse is exiting, the exhaust valve needs to opening. The exiting pulse will then help pull the exhaust out of the cylinder, assisting in the exhaust cycle. All professional drag racers use tuned open exhaust. Open exhaust just means there are no restrictions in the exhaust system, such as a muffler or a cat. Tuned exhaust means that it is set up so that the exhaust pulses are timed correctly. No exhaust means you have NO exhaust pipes at all. You will lose horsepower with no exhaust, because there is NO exhaust savaging due to the exhaust pulse.
John R has it right, additionally riding with no exhaust will damage the exhaust valves and seats because of the excessive heat caused from not having any back pressure in the exhaust. Drag bikes etc don't suffer that problem because the valves and valve seats are made of better material than is 'standard' kit in a road bike. Your bike will drop performance compared to having a good quality muffler fitted. A loud exhaust does no mean more horsepower.
