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Team from GM, Ford, FCA reviews how to calculate engine efficiency benefits of high octane fuels

Green Car Congress

Knock and fuel octane rating are becoming increasingly important due to many powertrain design trends including downsizing, downspeeding, cylinder deactivation, and hybridization. … To achieve continued improvement in engine efficiency and CO 2 emissions, it is critical to quantify the roles of fuel octane rating and alcohol content.

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Ford / AVL study concludes mid-level ethanol blend attractive as a long-term future fuel for use in optimized engines in US

Green Car Congress

Given the properties of the fuel blend, improved fuel efficiencies can be generated by several approaches, including downsizing/downspeeding; increased compression ratio; reduced enrichment; and the leveraging of improved efficiency at part load. Downsizing/downspeeding. Earlier post.). Review of ethanol properties. Reduced enrichment.

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Developing Fords EcoBoost Combustion System

Green Car Congress

The piston has a shallow bowl designed to ensure stable combustion during engine cold-start operations. Ford’s turbocharged, gasoline direct injection EcoBoost engines are targeted to play a significant near-term role in Ford’s efforts to reduce fuel consumption by enabling downsizing. Ford selected the multi-hole injector design.

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