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A restrictor plate or air restrictor is a device installed at the intake of an engine to limit its power. This kind of system is occasionally used in road vehicles (e.g., motorcycles) for insurance purposes, but mainly in automobile racing, to limit top speed and thus increase safety, to provide equal level of competition, and to lower costs; insurance purposes have also factored in for motorsports. == Racing series == A few top classes like Formula One limit only the displacement and air intake mouth dimension. However, in 2006 air restrictors (as well as rev limiters) were used by Scuderia Toro Rosso to facilitate the transition to a new engine formula. Many other racing series use additional air restrictors. * Formula 3, 2000cc, 215 hp * Formula SAE, 610cc, 20MM restrictor. * Deutsche Tourenwagen Masters, 4000cc, 470 hp * FIA GT Championship (now FIA GT1 World Championship) and other series using FIA GT regulations * Le Mans Prototypes used in American Le Mans Series and Le Mans Series have restrictors based on precalculated tables depending on the type and size of the engine and fuel * * The ALMS in the 2010 season combines both LMP1 and LMP2 into a single LMP class on all races except 12 Hours of Sebring and Petit Le Mans; LMP1-categorized cars use a 5% smaller air restrictor compared to LMP2- categorized cars to balance performance in the races〔(IMSA/ALMS Competitor Bulletin #10-01: Technical Specifications, 2010 )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「restrictor plate」の詳細全文を読む スポンサード リンク
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