| Paxman Ventura | |
|---|---|
| Overview | |
| Manufacturer | Davey, Paxman & Co |
| Designer | Geoffrey Bone[2] |
| Also called | YJ |
| Production | 1960–1992[1] |
| Layout | |
| Configuration | 60° vee: V6, V8, V12 or V16[3] |
| Displacement | V6: 39.42 litres (2,410 cu in) V8: 52.56 litres (3,210 cu in) V12: 78.84 litres (4,810 cu in) V16: 105.12 litres (6,410 cu in) |
| Cylinder bore | 7.75 inches (197 mm)[2][1] |
| Piston stroke | 8.50 inches (216 mm)[2][1] |
| Cylinder block material | Cast iron |
| Cylinder head material | Aluminium alloy |
| Valvetrain | OHV, 4 per cylinder[2] |
| Compression ratio | 13:1 |
| Combustion | |
| Operating principle | four-stroke turbo-charged high-speed diesel[3] |
| Fuel system | 2x CAV monobloc fuel injection pump (4x on V16), 11,500 psi (790 bar) (total) direct injection[2] |
| Fuel type | diesel |
| Output | |
| Power output | V12: 1,200–1,500 brake horsepower (890–1,120 kW; 1,200–1,500 PS) at 1,500 rpm V16: 1,600–1,870 brake horsepower (1,190–1,390 kW; 1,620–1,900 PS) at 1,500 rpm |
| Chronology | |
| Predecessor | Paxman YH, direct injection medium-speed diesel |
| Successor | Paxman Valenta |
The Paxman Ventura is an internal combustion diesel engine for railway locomotives, built by Davey, Paxman & Co.
The type YJ or Ventura was developed in the mid-1950s as Davey, Paxman's first high-speed diesel engine.[4] With a view to the forthcoming modernisation and dieselisation of British Railways (BR), it was intended as a successor to Paxman's existing medium-speed engine, the direct injection YH.[5] High-speed engines offered higher power-to-weight ratios, which in turn allowed locomotives to have a lower axle loading and greater route availability. The YJ was to have a weight of less than four tons for a 1,200 horsepower (890 kilowatts; 1,200 metric horsepower) V12, with versions of V6, V8, V12, and V16 configurations.[2][4] Their construction and reliable use though required more sophisticated manufacture than previously, with better metallurgy and balancing of the moving parts for faster running and a stiffer crankcase to avoid vibration.
A total of 1098 engines were built by Paxman in Colchester, England (147 V6, 190 V8, 426 V12, and 335 V16); a further 37 were built under licence in Italy by Motori Breda of Milan for the D.343 Class locomotives of the Italian State Railways.[1]
- ^ a b c d Cite error: The named reference
Carr-Venturawas invoked but never defined (see the help page). - ^ a b c d e f Carr, Richard (28 September 2022). "Ventura (also known as the YJ)". PaxmanHistory.org.uk. Richard Carr's Paxman history pages. Retrieved 15 August 2023.
- ^ a b Bolton, William F. (1963). The Railwayman's Diesel Manual (4th ed.). pp. 79–80.
- ^ a b Evans, R.K. (May 1964). "The Ventura – Paxman's high-speed engine". Modern Railways. pp. 328–329.
- ^ Diesel Manual (1963), pp. 49–53.