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Nissan R381
The Nissan R381 was a racing car developed by Nissan Motors in 1968 for use in the Japanese Grand Prix. It was the successor to the Nissan R380-II, which had been originally developed by the Prince Motor Company
==Development==
Following the defeat of the Nissan R380-II at the 1967 running of the Japanese Grand Prix, Nissan set about developing an improved car for the 1968 event. Aware of the new CanAm series in North America that ran under the new Group 7 classification, the new R381 would become a much more powerful and faster car in comparison to the previous model.
Knowing that the original Prince GR8 Straight-6 would not be powerful enough, Nissan planned to use a new Prince-built V12. However the engines would not be completed in time (partially due to this being the first time Nissan or Prince had constructed a V12), so the company turned to a Chevrolet 5.5L V8 which produced nearly 450 hp, twice the amount of the Prince GR8. Also borrowing from CanAm, most notably Chaparral, large rear wings were placed on the new design. These dual wings placed side by side could be driven by hydraulics that would move either the left or right wing up or down in order to increase cornering ability.
For bodywork, the R381 was initially an evolution of the R380's coupe design. The rear tail was lengthened and the engine cover made flat in order to increase rear downforce in conjunction with the rear wing. The back of the car was also made flat, with a Kamm tail effect. However, upon becoming aware of the new Toyota 7 car which also ran in Group 7 rules, Nissan chose to cut the roof of the R381 off. A thin windshield would be all that remained, while a tiny rollbar would be placed on the engine cover.
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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