Unlike many other exhaust system manufactures, all White Brothers E-Series exhaust systems are developed exclusively on the WB in-house Dynojet dyno. After development for maximum horsepower and torque, they are painstakingly fitted to perfection for easy, no hassle installation. Then, and only then, are they test ridden under the most extreme conditions, by some of the most fearsome test riders on the planet. These are the same riders that thrash the OEM test bikes for the major magazines. Bottom line, you get products that have been thoroughly put to the test.
| The overall design of the system from a styling standpoint was extremely important to us. The E-Series silencer body, discs, and end cap, being an elliptical shape, give a much improved fit to the motorcycle. Even the end cap, that actually has no exhaust outlet hole in it, was thoroughly thought-out to give you an esthetic appeal. The entire unit provides better clearance, more aerodynamic shape, better flow, and most importantly, more horsepower than conventional exhaust systems. |
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How The E-Series Diffuer Discs Work With Your Engine
A 4- stroke engine enters the exhaust phase, the piston moves upward, and the exhaust valve opens as spent gases flow into the exhaust pipe making room for fresh fuel. There is however a quantity of unburned gases that remain in the combustion cham-ber.It is at this instant, when both intake valves and exhaust valves open, that a properly designed exhaust system can help scavenge as much of the residual gas as possible. The more efficient the scavenging, the less diluted the incoming fuel-air mixture will be.
As the exhaust valves open, a shock wave is generated which travels down the pipe. When it reaches the end of the
pipe, negative pulse is reflected in the reverse direction. If the length of pipe is adjusted so that the suction
wave arrives back at the exhaust valve just before it closes, a vacuum is created, allowing the cylinder to be
charged with a purer mixture. The inertia in one moving exhaust packet assists the flow of the next charge. A purer
mixture can now enter each cylinder, resulting in stronger explosions and more power.
Essentially, this type of tuning produces an increase in power over a relatively small RPM range. The suction wave
produced is a combination of high energy and short duration. A wider powerband can be created with the use of a
diffuser. There are two types of diffusers on motorcycles; Conical and Radial. A Conical diffuser is commonly called
a megaphone (or S-Bend/Tail pipe in some cases). A radial diffuser is the E-Series Disc. Basically, a diffuser
creates suction waves with a lower energy peak and longer duration. A simple way of understanding the process is
thinking of a diffuser as creating a continual series of suction waves, providing effectivea 4 stroke engine enters
the exhaust phase, the piston moves upward, and the cylinder scavenging over a much wider RPM range.
[Click here for general tuning guide]
White Brothers Cycle Specialties
24845 Corbit PlaceYorba Linda, CA 92887
Call (714) 692-3404 or Fax (714) 692-3409
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