The Ultraboost Extreme Downsizing Project: Direct Injection, Compound Charging, Variable Valve Timing and 60% Less Capacity

The paper presents results from Ultra Boost for Economy, a collaborative project which aims to achieve the torque curve of a modern, high-specification 5.0 litre naturally-aspirated engine from a highly-boosted 2.0 litre engine, while encompassing the necessary mechanical attributes to employ such a concept in premium vehicles. The main purpose of this project was to show that the engine could, in itself, provide most of a 35% reduction in vehicle tailpipe CO2 emissions when measured on the New European Drive Cycle. The performance targets included achieving 32.4 bar BMEP at 3500 rpm, 142 kW/litre (190 bhp/litre) at 6500 rpm and 25.1 bar BMEP at 1000 rpm.

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