1974 Triumph TR6 Technical Specification and History

From 1967 to 1972 the cars developed 150 bhp, but this was problematical and lumpy in town traffic, and from 1972 was de-tuned to 125 bhp. The petrol Injection did not meet the US emission control regulations, so US cars had the 2,500 litre engine but equipped with twin Stromberg carburettors and only produced about 104 bhp.  

The interior remained similar to the TR4 and TR5 with a wooden dash and good quality trim.  The manual gearbox has synchromesh on all four gears and is fitted with overdrive that works on 3^rd and 4^th gears. 
 

Steel chassis with steel body bolted on separately.  All four wings bolt on to the inner wings.

History of PVF 255M:  

This car has been the subject of a complete body off restoration from 1988 through the early 1990s.  The chassis was stripped down and re-painted, the suspension rebuilt, all four wings replaced and the body repainted in its original colour of Mimosa Yellow.  The engine was rebuilt and the unreliable Lucas fuel pump replaced with a modern Bosch one.  The car won the award for Best TR at the 1993 Classic Sportscar Show and had covered less than 5,000 miles between then and 2001.  Prior to us buying it, the metering unit was changed so that the car could spend the rest of its life on unleaded petrol.

Technical: 

• Engine 2,498cc straight six cylinder engine with overhead valves operated by a single camshaft and pushrods.
• Develops 125bhp at 5,000 rpm and 132 lb ft of torque at 3,000 rpm  
• Mechanical fuel injection, originally using Lucas equipment although the fuel pump has been replaced by a more reliable, high pressure Bosch one. 
• Fitted with six branch sports exhaust manifold
• Manual 4 speed gearbox with synchromesh on all gears and overdrive on 3^rd and 4^th. 
• Servo assisted brakes with uprated, grooved and vented, discs on the front & aluminium finned drums on rear.
• Front suspension: double wishbones, coil springs, telescopic shock absorbers with anti-roll bar.
• Rear suspension: independent with cast aluminium semi-trailing arms, coil springs.  
• The original lever arm dampers have been replaced with Spax shock absorbers.
• Steering: Rack & pinion with 3 1/2 turns lock to lock. 
• Wheels: bolt on stove enamelled 5½J steel wheels with 165/15 radial tyres. 
• Tyre pressures (pounds per square inch): Front 24, Rear 28.
• 0-60 in 11.4 secs. 
• Top speed 116mph.