Triumph I6
| Triumph I6 | |
|---|---|
 | |
| Overview | |
| Manufacturer |
Standard Triumph Leyland Motors British Leyland TVR |
| Also called | Triumph Six Cylinder |
| Production | 1960–1977 |
| Chronology | |
| Successor | Rover 2600 |
The Triumph Six Cylinder or Triumph I6 engine is a straight-six engine made from cast-iron and using pushrod-actuated overhead valves. The engine was introduced by Standard Triumph in their Standard Vanguard Six in 1960. It has been used in several vehicles, including some kit cars.
Origin
Standard Eight engine
The Triumph six is based on the 4 cylinder engine first used in the Standard Eight in 1953. Diplacement of the engine in the Eight was 803 cc.
The engine was modified a number of times for use in the Standard Ten, Triumph Herald, and Triumph Spitfire. First for the 948 cc Herald, and again for the 1147 cc Herald 1200, the cylinders were re-aligned to give better clearance for the head studs and allow the bore to be enlarged. The engine was further developed and bored from 69.3 mm (2.7 in) in the 1147 cc version to 73.7 mm (2.9 in) giving 1296 cc for the Herald 13/60, the stroke was also increased from 76 mm (3.0 in) to 86.5 mm (3.4 in) providing 1493 cc for the Spitfire 1500.
Two cylinders added
At the same time there was another project at Triumph to provide a more sporty version of the Herald, and it was decided to add two extra cylinders to the engine, giving a 1596 cc 6-cylinder engine.
Further increases in bore and stroke, including a bore increase to 74.6 mm (2.9 in), gave a 2-litre version used in the Standard Vanguard Six and Triumph 2000.
The engine was used in the Triumph TR5 and TR250 sportscars, replacing the Standard inline-four engine used in TRs since the TR2. For this application, the stroke was increased to 95 mm (3.7 in), giving 2498 cc. This new 2.5-litre version gave 150 bhp (112 kW; 152 PS) in the TR5 when equipped with the Lucas mechanical fuel injection system. 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).
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Triumph I6
 Sound clip of a 1998 cc Triumph 6 cylinder engine, as fitted to a 1969 Triumph Vitesse.
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Technical
A partial chart of triumph engine numbers is posted on the "Spitfire & GT6 magazine" site.[1] However the capacity appears not to match the bore/stroke, or that published on other sites including the GT6 Ezine,[2] hence the corrections in the tables below.
Engine Applications Chart
| Engine No. Prefix | Capacity | Car |
|---|---|---|
| HB | 1596 cc | Vitesse 6 |
| HC | 1998 cc | Vitesse 2 Litre |
| KC | 1998 cc | GT6 Mk1/2 |
| KD | 1998 cc | GT6 Mk1/2 (Anti Smog) (US?) |
| KE | 1998 cc | GT6 Mk3 |
| KF | 1998 cc | GT6 Mk3 (US) |
| KG | 1998 cc | GT6 Mk3 (Sweden) |
| MB | 1998 cc | 2000 Mk1 |
| MB | 1998 cc | 2000 Mk1 |
| MG, MM, MN | 2498 cc | 2500 |
| ME, ML | 1998 cc | 2000 Mk2 |
| CC | 2498 cc | TR250 & TR6 |
| CF | 2498 cc | TR6 |
| CP, CR | 2498 cc | TR6(injection) and TR5PI |
Factory Quoted Power Chart
| Model | Quoted power @rpm | Quoted torque @rpm | Capacity |
|---|---|---|---|
| TR5 | 150 bhp (112 kW; 152 PS) @5500 | 164 lb·ft (222 N·m) @3500 | 2498 cc |
| TR250 | 104 bhp (78 kW; 105 PS) @4500 | 143 lb·ft (194 N·m) @3000 | 2498 cc |
| TR6 (69-72) | 150 bhp (112 kW; 152 PS) @5500 | 164 lb·ft (222 N·m) @3500 | 2498 cc |
| TR6 (73...) | 124 bhp (92 kW; 126 PS) @5000 | 143 lb·ft (194 N·m) @3500 | 2498 cc |
| TR6 (USA) | 104 bhp (78 kW; 105 PS) @4500 | 143 lb·ft (194 N·m) @3000 | 2498 cc |
| 2.5 PI Mk1 & Mk2 | 132 bhp (98 kW; 134 PS) @5500 | 153 lb·ft (207 N·m) @2000 | 2498 cc |
| 2500 Mk2 | 99 bhp (74 kW; 100 PS) @4700 | 133 lb·ft (180 N·m) @3000 | 2498 cc |
| 2500 TC | 106 bhp (79 kW; 107 PS) @4700 | 139 lb·ft (188 N·m) @3000 | 2498 cc |
| 2000 Mk1 | 90 bhp (67 kW; 91 PS) @5000 | 117 lb·ft (159 N·m) @2900 | 1998 cc |
| 2000 Mk2 | 84 bhp (63 kW; 85 PS) @5000 | 100 lb·ft (140 N·m) @2900 | 1998 cc |
| 2000 TC | 91 bhp (68 kW; 92 PS) @4750 | 110 lb·ft (150 N·m) @3300 | 1998 cc |
| GT6 Mk1 | 95 bhp (71 kW; 96 PS) @5000 | 117 lb·ft (159 N·m) @3000 | 1998 cc |
| GT6 Mk2 | 104 bhp (78 kW; 105 PS) @5300 | 117 lb·ft (159 N·m) @3000 | 1998 cc |
| GT6+ | 95 bhp (71 kW; 96 PS) @4700 | 117 lb·ft (159 N·m) @3400 | 1998 cc |
| Vitesse 6 | 70 bhp (52 kW; 71 PS) @5000 | 92 lb·ft (125 N·m) @2800 | 1596 cc |
| Vitesse 2L | 95 bhp (71 kW; 96 PS) @5000 | 117 lb·ft (159 N·m) @3000 | 1998 cc |
| Vitesse Mk2 | 104 bhp (78 kW; 105 PS) @5300 | 117 lb·ft (159 N·m) @3000 | 1998 cc |
Racing
Triumph raced Spitfires, and some early GT6 prototypes at Le Mans, with some good success, and later at Sebring but due to rule changes and the takeover by Leyland, this was not continued.
References
- ↑ "Triumph Spitfire and GT6 Engine Numbers". Retrieved 4 April 2010.
- ↑ "GT6 Ezine, Reference Section". Retrieved 4 April 2010.