|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.
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