Kawasaki Ninja H2 is a "supercharged supersport" class[3] motorcycle in the Kawasaki Ninja sportbike series, manufactured by Kawasaki Heavy Industries, featuring a variable-speed centrifugal-type supercharger.[ With a claimed 300 horsepower (220 kW), the H2R track-only variant has 50% more power than the fastest street-legal motorcycles, and would greatly exceed the production motorcycle top speed of nearly 200 miles per hour (320 km/h) held by the Suzuki Hayabusa or Kawasaki ZX-12R,[1] but the comparable street-legal H2 has a much lower power output of 200 hp (150 kW).[8] Its namesake is the 750 cc Kawasaki H2 Mach IV,[2][9] an inline triple that was introduced by Kawasaki in the early 1970s to "disrupt what it saw as a sleeping motorcycle market".[10] Engine shown at 2013 Tokyo Motor Show, supercharger has cover embossed "Kawasaki" to right of cylinders The H2 was pre-announced by Kawasaki in a late 2014 teaser campaign, and was widely expected to be fully revealed at the Intermot trade show the same year. Before full details were released by Kawasaki, the supercharged inline-4 engine[11] was thought by several industry observers to be identical to, or closely related to, a nearly 1,000 cc inline-4 unit with a centrifugal supercharger displayed by Kawasaki at the 2013 Tokyo Motor Show.[5][10][12] Kevin Cameron published an analysis showing an engine of that displacement, mildly boosted at 5 psi (34 kPa), would generate 203 horsepower (151 kW), well beyond that of Kawasaki's current leader, the 168 horsepower (125 kW) ZX-14 (the horsepower figures are expressed at the rear wheel). The same engine would generate 257 horsepower (192 kW) with 10 psi (69 kPa) of pressure. His analysis included a discussion of the benefits of a two-speed supercharger for this application, to provide more linear power delivery (as opposed to the intractable Japanese turbo bikes of the 1980s that suffered from turbo lag). Cameron also said Kawasaki patent documents suggested the engine would rely on evaporative cooling using port fuel injection, instead of a bulky intercooler.[10] Kawasaki claimed the 2013 model was the first supercharger designed by a motorcycle manufacturer.[13] In 2013, journalists said that the engine could power the "next generation [Ninja] ZX-14R" sportbike.[14] Journalists also noted that Kawasaki already has a production inline-4 supercharged (but intercooled[15]) engine powering the Jet Ski Ultra 300X personal water craft.[16] Engine and supercharger[edit] Cutaway H2R engine and supercharger. Orange painted plenum surrounds impeller, behind which is visible part of planetary gear system. The H2R engine is a 998 cc inline-4, four-valve, dual overhead cam design with a two-speed, centrifigual supercharger claimed by Kawasaki to develop 300 horsepower (220 kW).[19][20][17][1] The supercharger is driven by a series of gears and shafts connecting the flywheel to a planetary drive, finally spinning a dog-shifted two-speed shaft attached to the impeller.[1] Rider control is throttle by wire.[29] It is the first production motorcycle with a supercharger,[27] although turbochargers were available on some models in the early 1980s. A centrifugal supercharger has the advantage of generating less heat than other designs, especially scroll-type or screw-type superchargers.[1][27] Excess heat in the intake charge can cause pre-ignition that will destroy the engine.

• published: 19 Jan 2016
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