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In most motorcycles, all or most of the exhaust system is visible and may be chrome plated as a display feature. Aftermarket exhausts may be made from steel, aluminium, titanium, or carbon fiber. Motorcycle exhausts come in many varieties depending on the type of engine and its intended use.
A 4-2-1 exhaust system is a type of exhaust manifold for an engine with four cylinders per bank, such as an inline-four engine or a V8 engine. The layout of a 4-2-1 system is as follows: four pipes (primary) come off the cylinder head , and merge into two pipes (secondary), which in turn finally link up to form one collector pipe.
Arrow was founded in 1985 in Italy by Giorgio Giannelli to make high performance exhaust systems. The company's first association with motorsports success was with Belgian rider Jobé winning the 500 cc Motocross World Championship. Since 2000 Arrow parts have been used on bikes that won 20 World Titles, in SBK, SS, MX and Supermoto. [1]
Akrapovič d.d. (Slovene pronunciation: [aˈkrapɔʋitʃ]) is a Slovenian manufacturer of exhaust systems that began in 1990 in the motorcycle market, and expanded into automobile exhausts in 2010. [ 2 ] [ 3 ] A global exhaust supplier in motorcycle sport , [ 4 ] [ 5 ] Akrapovič exhausts are used on motorcycles in Moto GP , [ 6 ] superbike ...
When the descending piston first exposes the exhaust port on the cylinder wall, the exhaust flows out powerfully due to its pressure (without assistance from the expansion chamber) so the diameter/area over the length of the first portion of the pipe is constant or near constant with a divergence of 0 to 2 degrees which preserves wave energy.
AJS was already developing another supercharged engine, the AJS Porcupine, but, three months after the Albi race, the FIM banned all forms of forced induction for motorcycle racing. Motor Cycle News reported that the 'Sammy Miller' machine was refurbished and ran during August, 1979 "for the first time since it seized in Albi, France in 1946".
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