In other words, a 1976 Kawasaki KZ 750 has an exhaust pipe diameter of 1.5 inches. A stepped pipe would start at 1.5 inches and increase to 1.65 inches a short distance later, increasing incrementally until the desired final diameter is reached. Many DIYers purchase pre-formed mandrel bent tubing to cut and weld together as needed to form the headers, removing the need for an expensive mandrel-bending machine.
Conceptualize your exhaust manner and the type of racing it is intended for. Is your motorcycle a drag racer, needing authentic top-end influence? Is your motorcycle a path racer, requiring an exhaust operation that Testament guidance the bike faculty gone of slower turns before transitioning faster, straight-line performance? These are critical factors that Testament define your finished product. Hire into control that, while a modified exhaust may emend performance in a particular rpm scope, it may seriously overcome the bike's performance in other rpm ranges.
High-Horsepower System
Building a action designed for high-performance drag racing can be done by providing a free-flowing route for escaping gases to result. Catch stainless steel tubing to construct your transaction, by reason of stainless steel retains heat worthier than aluminium or gentle steel, aiding the flow of Gauze and preventing discomfort from heat emanated by your pipes. To accrual exhaust flow, the breadth of the tube should initially match the calibre of the inventory header pipe and "manner," or gradually accession in breadth, as it nears the purpose of the header pipe.
DIY Racing Motorcycle Exhaust ActionRacing can be arduous for the privateer motorcycle racer, who must obtain any Accoutrement and expenditure associated with the sport without the godsend of sponsors. To this neb, many aspiring racers keep produced their own performance parts with inexpensive tools and materials to countervail the ever-present budgetary costs. Really, assorted well-known exhaust manufacturers, such as Vance & Hines, were once garage-based racers and tuners. Fabricating an exhaust for a racing motorcycle begins with considering the type of racing you accomplish.
Planning the System
Be sure that the header pipes, for multicylinder bikes, are of equal length, or you will lose power. Finally, the header pipe can terminate through a straight pipe, megaphone or a slightly baffled muffler. Straight pipes or a megaphone will increase the power the most in the higher rpm ranges, but will be very loud. Baffled pipes will cut down some of the excess noise, but will also slightly restrict gas flow.
Road Racing
Consider the type of tracks that you race on as inspiration for your exhaust system. Race tracks with tighter, more complex turns and corners will require a healthy dose of power from the low- to mid-range. This can be done by creating a stepped header but shorten the total length of the headers to enhance bottom-end power. Alternatively, if you race on tracks that require more straight-line speeds, slightly lengthen the headers to increase performance in the mid-range. Finally, bend the header pipe upwards slightly before it terminates to create a small bit of resistance to the gas flow. As a side note, many of the larger racing organizations have begun imposing sound level restrictions on their races. To comply, install or fabricate a baffled muffler to reduce noise emissions.
