The Paxman VP185 is an engine manufactured by Paxman, Colchester. It is used in marine and railway applications and available as both a V12 and V18.
| Paxman VP185 | |
|---|---|
| Overview | |
| Manufacturer | Paxman |
| Layout | |
| Configuration | V12 & V18 four-stroke turbo-charged & intercooled diesel |
| Cylinder bore | 185 mm |
| Piston stroke | 196 mm |
| Combustion | |
| Fuel type | Diesel |
| Chronology | |
| Predecessor | Paxman Valenta |
The VP185 was launched in May 1993 as a successor to the Paxman Valenta. It differed from the Valenta with a 90-degree cylinder bank angle, rather than a 60-degree vee to reduce its height, unit pump injectors eliminating two camshafts, side by side connecting rods to reduce manufacturing costs, higher firing pressures; increased power output, improved fuel consumption and emissions performance.[1]
Beginning in 1994, a small number of British Rail Class 43 power cars were fitted with Paxman VP185 engines, however the majority retained Valentas into the 21st century.[2][3] With the Class 43s in need of new engines in the mid-2000s, most operators opted for the MTU engines.[4][5][6] East Midlands Trains, who already was the largest operator with 14, opted to standardise on VP185s, ultimately having 26 examples.[7][8] The last was withdrawn from regular service by East Midlands Railway in December 2020, however several have gone for further service with Colas Rail and Locomotive Services Limited.[9][10][11]
The engine was also fitted to CountryLink's 19 XPT power cars in Australia, which were based on the HST power car design, in the early 2000s when it opted to replace its Valentas.[12][13]
The VP185 continues to be manufactured by Paxman's successor MAN Energy Solutions for marine use.[14][15]