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Norton Classic
The Norton Classic is a rotary-engined motorcycle built in 1987 by Norton as a special edition of just 100 machines.
==Engine development==
The Classic used an air-cooled twin-rotor Wankel engine that had been developed by David Garside at BSA's Umberslade Hall research facility.〔The Wankel Rotary Engine: A History By John B. Hege page 137, ISBN 978-0-7864-2905-9〕〔 "BSA, Born 1861, died 1973" - W P Murray, July 1994 - Staffordshire〕Garside, who had been impressed by the air-cooled single-rotor Fichtel & Sachs engine in the Hercules motorcycle, installed a bought-in F&S engine into a BSA B25 'Starfire' frame as a "proof of concept". This proved reliable and smooth, but under-powered. Garside then created a prototype twin-rotor engine (with F&S rotors) which doubled the capacity of the earlier test "mule". This twin-rotor engine was installed in a BSA A65 frame.〔"Bike" magazine Summer 1973〕
Wankel engines run very hot, so Garside gave this air-cooled motor additional interior air-cooling. Air was drawn through a forward-facing filter situated to provide a ram air effect. This air passed through the interior of the rotors and then into a large pressed-steel plenum before entering the combustion chambers ''via'' twin carburettors.〔"Cycle World" magazine February 1971〕 The plenum (which doubled as the bike's semi-monocoque frame) enabled the transfer of much of the heat to the surrounding atmosphere. The carburation process further reduced temperatures ''via'' the heat of evaporation. Even so, at 50°C the fuel-air mixture was still hotter than ideal, and the engine's volumetric efficiency remained somewhat impaired The eccentric shaft's main bearings and the inlet manifolds were fed by oil-injection lubrication, and the fuel-air mix also carried residual mist of oil from the interior of the rotors, which helped to lubricate the rotor tips.〔Bill Murray monograph 1985: "The decline of the British motorcycle industry"〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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