![]() ![]() with a 106 hp version of the TR250's engine in the United States. The TR6, made from 1969 to 1975, used the TR5's engine, detuned to 125 bhp (93 kW 127 PS) in 1973. The TR250 was sold in the US with Stromberg carburettors to avoid the need for additional emissions control systems this reduced the power to 105 bhp (78 kW 106 PS) at 4500 rpm. When tested on dynamometers, 110 to 130bhp at the crankshaft is more usual, and may explain Triumph's decision to fit the TR7 with a 2-litre slant-four engine, whose power output and hence performance were in fact similar to those of the earlier and ostensibly more powerful engine. When equipped with the Lucas mechanical fuel injection system in the TR5, this new 2.5-litre version gave a claimed 150 bhp (112 kW 152 PS) at 5500 rpm. For this application, the stroke was increased to 95 mm (3.7 in), giving 2498 cc. ![]() Beginning in 1967, the engine was used in the Triumph TR5 and TR250 sports cars, replacing the Standard inline-four engine used in TRs from the TR2 to the TR4A. ![]()
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