The TVR Speed Twelve engine is the name of a V12 engine manufactured by TVR for use in the TVR Speed 12 race car, and later the TVR Cerbera Speed Twelve road car. The engine was developed by essentially joining two Speed Six engine blocks to a common crankshaft. However it featured a revised cylinder head design with bucket valve actuation in place of the Speed Six's finger follower system. The completed engine displaced 7.7 litres and was originally developed for racing applications in TVR's Speed Twelve. Later on, a version was developed for the prototype of a road car to be called the Cerbera Speed Twelve.
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| - TVR Speed Twelve (es)
- TVR・Speed Twelve (ja)
- TVR Speed Twelve engine (en)
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| - TVR・Speed Twelve（スピードトゥウェルヴ）は、イギリスのTVRが開発していた自動車用エンジンである。 開発はされていたが、実用化までには至っていない。 (ja)
- El TVR Speed Twelve es el nombre de un motor de gasolina V12 manufacturado por TVR para su uso en el coche de competición TVR Speed 12, y posteriormente el TVR Cerbera Speed 12, su versión de carretera. El motor fue desarrollado principalmente uniendo dos motores a un cigüeñal común. El conjunto tiene una capacidad de 7,7 litros y fue originalmente desarrollado para competición. Después se aplicó el motor a la versión de calle del coche. Extrañamente para un automóvil, el bloque motor está hecho de acero, en lugar de hierro fundido o aluminio.
* Datos: Q5977197 (es)
- The TVR Speed Twelve engine is the name of a V12 engine manufactured by TVR for use in the TVR Speed 12 race car, and later the TVR Cerbera Speed Twelve road car. The engine was developed by essentially joining two Speed Six engine blocks to a common crankshaft. However it featured a revised cylinder head design with bucket valve actuation in place of the Speed Six's finger follower system. The completed engine displaced 7.7 litres and was originally developed for racing applications in TVR's Speed Twelve. Later on, a version was developed for the prototype of a road car to be called the Cerbera Speed Twelve. (en)
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| - TVR Speed Twelve engine (en)
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| - TVR Speed Twelve engine (en)
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| - El TVR Speed Twelve es el nombre de un motor de gasolina V12 manufacturado por TVR para su uso en el coche de competición TVR Speed 12, y posteriormente el TVR Cerbera Speed 12, su versión de carretera. El motor fue desarrollado principalmente uniendo dos motores a un cigüeñal común. El conjunto tiene una capacidad de 7,7 litros y fue originalmente desarrollado para competición. Después se aplicó el motor a la versión de calle del coche. Extrañamente para un automóvil, el bloque motor está hecho de acero, en lugar de hierro fundido o aluminio. La versión de competición del motor produce unos 675 CV, debido a las bridas restrictoras de entrada obligatorias para competición. La versión de calle del motor no equipaba esos restrictores; y según los ingenieros de TVR, rompió el dinamómetro de su banco de prueba, que podía marcar hasta 1000 CV. La potencia de salida fue tasada de modo conservador en unos 940 CV. Cuando el prototipo de automóvil fue probado en carretera por , informó que el vehículo era demasiado potente para su uso práctico y el proyecto fue abandonado.
* Datos: Q5977197 (es)
- The TVR Speed Twelve engine is the name of a V12 engine manufactured by TVR for use in the TVR Speed 12 race car, and later the TVR Cerbera Speed Twelve road car. The engine was developed by essentially joining two Speed Six engine blocks to a common crankshaft. However it featured a revised cylinder head design with bucket valve actuation in place of the Speed Six's finger follower system. The completed engine displaced 7.7 litres and was originally developed for racing applications in TVR's Speed Twelve. Later on, a version was developed for the prototype of a road car to be called the Cerbera Speed Twelve. Unusually for an automobile, the Speed Twelve's engine block was not constructed of cast iron or aluminum alloy, but rather of steel. The racing version of the engine produced approximately 675 bhp (503 kW) with its power limited by the intake restrictors required by racing regulations. For the road-version of the engine, the restrictors were not needed so the engine was developed without them. According to reports from TVR engineers, the de-restricted engine snapped the central shaft of their 1,000 bhp (750 kW)-rated dynamometer during the bench-test. The engine's output was later estimated at 960 bhp (720 kW), though the official figure given by TVR was 800 bhp (600 kW). When the prototype vehicle was road-tested by then-owner Peter Wheeler, he reportedly concluded that the vehicle was too powerful to be practical and the project was scrapped. (en)
- TVR・Speed Twelve（スピードトゥウェルヴ）は、イギリスのTVRが開発していた自動車用エンジンである。 開発はされていたが、実用化までには至っていない。 (ja)
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| - Naturally aspirated V12 (en)
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