Paxman Valenta
The Paxman Valenta, also known as Y3J and RP200, is a diesel fuelled internal combustion engine formerly made by Paxman in Colchester, England. It was originally developed for, and previously used in the British Rail (BR) Class 43 diesel-electric locomotives, a pair of which powered the InterCity 125 High Speed Train (HST) in a push-pull train set configuration. The Valenta has also been used for electricity generation in diesel generators on offshore oil rig platforms in British waters.
| Paxman Valenta | |
|---|---|
Paxman Valenta V12 power unit with turbocharger and Brush Traction alternator fitted | |
| Overview | |
| Manufacturer | Paxman |
| Designer | Roy Dingle, Morriss Clover, Arthur Hammond, Ray Roxby |
| Also called | Y3J and RP200 |
| Production | 1972–???? |
| Layout | |
| Configuration | I6, 60° V8, 60° V12, 60° V16, 60° V18 |
| Displacement | I6: 39.48 litres (2,410 cu in) V8: 52.64 litres (3,210 cu in) V12: 78.96 litres (4,820 cu in) V16: 105.28 litres (6,420 cu in) V18: 118.44 litres (7,230 cu in) |
| Cylinder bore | 197 millimetres (7.756 in) |
| Piston stroke | 216 millimetres (8.504 in) |
| Cylinder block material | Cast iron |
| Cylinder head material | Cast iron |
| Valvetrain | OHV, 4 per cylinder |
| Valvetrain drive system | gear-driven |
| Compression ratio | 13:1 |
| RPM range | |
| Idle speed | 600 rpm |
| Max. engine speed | 1,640 rpm |
| Combustion | |
| Operating principle | four-stroke diesel, turbo-charged & intercooled |
| Turbocharger | water-cooled turbocharger, two on lower-power engines |
| Fuel system | Lucas Bryce unit injector direct injection per cylinder |
| Management | Regulateurs Europa 1100 series centrifugal governor, remotely operable |
| Fuel type | diesel, 45 cetane |
| Oil system | wet sump, SAE30 or 40 |
| Cooling system | water-cooled |
| Output | |
| Power output | I6: 1,007 kW (1,350 bhp; 1,369 PS) at 1,600 rpm V8: 1,492 kW (2,001 bhp; 2,029 PS) at 1,600 rpm V12: 1,680–2,440 kW; 2,280–3,320 PS (2,250–3,270 bhp) at 1,500-1,640 rpm V16: 3,250 kW (4,360 bhp; 4,420 PS) at 1,640 rpm V18: 3,655 kW (4,901 bhp; 4,969 PS) at 1,640 rpm |
| Dimensions | |
| Dry weight | V12: 8.12 tonnes (7.99 long tons; 8.95 short tons) V18: 11.15 tonnes (10.97 long tons; 12.29 short tons) |
| Chronology | |
| Predecessor | Paxman Ventura |
| Successor | Paxman VP185 |
It is still in use in various marine applications today, such as the Upholder / Victoria class submarines, and additionally to provide the electrical power to propel and operate the Royal Navy's Type 23 frigates. The Valenta marine range was available brake powers ranging from 695 to 3,655 kilowatts (940 to 4,970 metric horsepower; 930 to 4,900 brake horsepower) rated to ISO 3046.