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The Triumph TR7 Sprint version of the Triumph TR7 sports car was produced in 1977 by the Triumph Motor Company then part of British Leyland. However, it was produced in only very limited numbers: Probably a maximum of 61 in total were manufactured. It used the 127 bhp, 16-valve, 2-litre version of the Triumph slant-four engine from the Triumph Dolomite Sprint, a highly tuned version of which, "rated at 225 bhp at 8000 rpm" by 1977, was used in the Group 4 TR7 cars of the BL works rally team, from 1976 until 1978. This was instead of the TR7 base model's 105 bhp, 8-valve, 2-litre version of the same basic slant-4 engine. The 16-valve version was originally specified in the Dolomite Sprint at 135 bhp, and "Spenser King relates how he went away on holiday and came back to find an engine runni

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  • La versión Triumph TR7 Sprint del deportivo Triumph TR7 fue producida en 1977 por Triumph Motor Company (entonces parte de British Leyland) en cantidades muy limitadas: probablemente no más de 61 unidades en total. Usó el motor Triumph slant-four de 16 válvulas y 2 litros con 127 caballos del Triumph Dolomite Sprint, en una versión altamente preparada. Este motor, "declarado en 225 CV a 8000 rpm" en 1977, se utilizó en los TR7 del Grupo 4 del equipo de rallyes de fábrica de British Leyland (BL), desde 1976 hasta 1978. Sustituyó al propulsor del modelo base del TR7 de 105 caballos, 8 válvulas, y 2 litros, una versión más sencilla del mismo motor slant-4.​​​ La versión de 16 válvulas se especificó originalmente en el Dolomite Sprint en 135 caballos, y los motores estándar cuidadosamente ensamblados eran conocidos por dar sostenidamente 150 caballos en el banco de pruebas de fábrica.​​​ (es)
  • The Triumph TR7 Sprint version of the Triumph TR7 sports car was produced in 1977 by the Triumph Motor Company then part of British Leyland. However, it was produced in only very limited numbers: Probably a maximum of 61 in total were manufactured. It used the 127 bhp, 16-valve, 2-litre version of the Triumph slant-four engine from the Triumph Dolomite Sprint, a highly tuned version of which, "rated at 225 bhp at 8000 rpm" by 1977, was used in the Group 4 TR7 cars of the BL works rally team, from 1976 until 1978. This was instead of the TR7 base model's 105 bhp, 8-valve, 2-litre version of the same basic slant-4 engine. The 16-valve version was originally specified in the Dolomite Sprint at 135 bhp, and "Spenser King relates how he went away on holiday and came back to find an engine running on the bed giving 150 bhp at the first build." The reasons why so few TR7 Sprints were produced has been a matter of some debate, since it was never a catalogued model. It is widely assumed that the TR7 Sprints were built with the intention of it being produced for sale, but cancelled after only a few had been made. The suggestions are that it was either cancelled as a result of industrial action, and the consequent loss of BL's market share, or because the sales and marketing department did not want it, as it was not a sufficient improvement over the TR7 base model or because it could not meet the 1976 changes to emissions legislation requirements for the US market - at which the TR7 and later TR8 were primarily aimed. It has also been noted that none of the suggested reasons for cancellation are a good match for when the main production ceased about the end of June 1977. Neither do they explain why a 16-valve model would have started production with the TR8 so near, why no proper records for the model have been found, nor why the cars that were built would have been sold off, rather than scrapped or returned to normal specification - as happened to the 25 or so O-series engined TR7 version development cars when that programme was cancelled a few years later. There is, however, some evidence that the 16-valve TR7 model was cancelled in favour of the TR8 in 1975 or 1976, but BL had still needed some 16-valve engined TR7s in 1977 as homologation specials. The cancellation was with that of the proposed Dolomite replacement , which was also to use the 16-valve version of the slant-four engine and an electronic fuel injection system that should have met US emissions requirements. These were cancelled after BLMC went bankrupt in late 1974 and was essentially nationalized under the almost £3 billion plan in the 1975 Ryder Report (British Leyland), which was still in force well into 1977. And several sources note that the 16-valve TR7 model was cancelled at the same time as or before this injection system. The need for homologation, and some production 16-valve TR7s that had to be "meant for the normal sale" and needed some supporting documentation, was to continue rallying the 16-valve Group-4 TR7 into 1978. This followed a change to the FIA's rules disallowing approval on 100 kits of parts (the 100-off rule), and a ban on some components including optional multi-valve cylinder heads, which applied to the TR7 and several other rally cars from the end of 1977. Several pictures in the British Motor Museum archives, titled "TR7 Sprint Homologation" and dated 1 Nov. 1977, show one of the TR7 Sprints. A second approval for the use of the 16-valve head on the Group 4 TR7 rally car was granted by the FIA in February 1978 in time for its use in the Mintex rally of that year. (en)
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  • Figure 1: TR7 Sprint (en)
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  • La versión Triumph TR7 Sprint del deportivo Triumph TR7 fue producida en 1977 por Triumph Motor Company (entonces parte de British Leyland) en cantidades muy limitadas: probablemente no más de 61 unidades en total. Usó el motor Triumph slant-four de 16 válvulas y 2 litros con 127 caballos del Triumph Dolomite Sprint, en una versión altamente preparada. (es)
  • The Triumph TR7 Sprint version of the Triumph TR7 sports car was produced in 1977 by the Triumph Motor Company then part of British Leyland. However, it was produced in only very limited numbers: Probably a maximum of 61 in total were manufactured. It used the 127 bhp, 16-valve, 2-litre version of the Triumph slant-four engine from the Triumph Dolomite Sprint, a highly tuned version of which, "rated at 225 bhp at 8000 rpm" by 1977, was used in the Group 4 TR7 cars of the BL works rally team, from 1976 until 1978. This was instead of the TR7 base model's 105 bhp, 8-valve, 2-litre version of the same basic slant-4 engine. The 16-valve version was originally specified in the Dolomite Sprint at 135 bhp, and "Spenser King relates how he went away on holiday and came back to find an engine runni (en)
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