Study Finds Strong Synergy Between Spark Ignition Engine Downsizing and Low-to-Moderate Alcohol Blend Fuels
Green Car Congress
MAY 1, 2009
A study by engineers from Mahle Powertrain Ltd and BP found strong synergy between spark ignition (SI) engine downsizing and fuel containing low-to-moderate amounts of alcohol, including ethanol and butanol. When alcohol was added to the blend, fuel consumption over the drive cycle increased in direct proportion to the reduction in calorific value of the fuel. The addition of alcohol did not improve excess air tolerance.