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Longevity was our first requirement. To achieve this we needed to change the means by which the piston movement was constrained. A cylinder with large port openings does not satisfactorily restrain the piston or the piston rings when all these components are changing in size and shape.

Reliability demanded that the temperature of the piston be controlled when the engine is operating at a continuous and high load.

Efficiency was another prime requirement. The key to efficiency is to reduce the internal friction and improve the internal gas flow. We therefore needed to remove load bearing sliding components and create displacement driven full loop scavenge pattern to reduce fresh charge and exhaust gas mixing and improve trapping.

Low oil consumption was needed to ensure that both the cost of operation and the level of emissions met the expectations for engines of the future. Keeping the oil separate from the fuel and from mixing with the induction air was clearly essential.



:: How we achieved these objectives »


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