Waukesha VHP Series 5

The Waukesha VHP Series Five enriched mixture engines combine innovative technology with 50 years of experience in the VHP engine range. The Series Five family of engines, L7042GSI S5, L7044GSI S5 and P9394GSI S5, delivers 13% more horsepower, increased fuel flexibility, a 10% reduction in fuel consumption, a maximum 20% reduction in life cycle cost and extended service intervals of more than 30%. The increased power and improved performance are retained when temperatures or pressures rise above the values set for VHP models, meaning the Series Five engines operate by applying intelligent features rather than excessive force.
  • Power at 1200 rpm1500 hp - 2500 hp
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Performance of the VHP range 5 engines L7042GSI S5 L7044GSI S5 P9394GSI S5
Power output at 1200 rpm 1500 hp 1900 hp 2500 hp
BSFC (Btu/hp efficiency; -0/+5% of lower calorific value) 7209 7063 6972
Altitude before derating 4800 feet at 100 °F
4000 feet at 120 °F
5000 feet at 100 °F
4200 feet at 120 °F
4000 feet at 120 °F
Environment before derating 120 °F 120 °F 120 °F
Start of fuel capacity reduction No reduction in fuel capacity 55 WKI (~ 1,250 Btu/ft3 lower calorific value) 58 WKI (~ 1225 Btu/ft3 lower calorific value)
Power output at 35 WKI (2350 BTU/ft3 lower calorific value) 1500 hp 1600 hp 2135 hp
Spark plug replacement interval 4000 hours 4000 hours 4000 hours
Oil change interval 4000 hours 4000 hours 4000 hours


The Series Five engines are capable of delivering more power than previous versions without increasing the load on engine components. This is made possible by combusting an enriched fuel mixture using the Miller cycle, a modified cylinder head design that lowers the temperature in critical areas, and optimised piston design. The Miller cycle, shifts operation from the piston to the turbocharger, reducing combustion and exhaust temperatures, making Series Five engines the most fuel-efficient VHP engines ever, despite running in an enriched fuel mix mode.


Improved cylinder head improves reliability and cylinder head life. The piston design is optimised to reduce the amount of unburned hydrocarbons, improving emissions and fuel consumption while reducing the temperature of the piston itself, and this improves fuel versatility even at high power ratings. Improvements to the ignition system allow the spark plug change interval to be extended to 4,000 hours.


A 10% reduction in fuel consumption reduces the carbon footprint and harmful emissions. Engines running on an enriched fuel mix can be more fuel-efficient than those running on a lean mixture. Reduced heat loss allows a similarly sized cooler to be used on larger engines.

Scope of application:

  • Injection into the reservoir
  • Cogeneration
  • Oil and gas
  • Pumping of oil and gas
  • Downstream Processing
  • Recovery of produced gas / Wellhead
  • Storage
  • Energy supply for oilfields

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