Imperial College London


Faculty of EngineeringDepartment of Mechanical Engineering

Chair in Thermofluids



+44 (0)20 7594 7032p.aleiferis




Ms Serena Dalrymple +44 (0)20 7594 7029




615City and Guilds BuildingSouth Kensington Campus






BibTex format

author = {Cairns, A and Todd, AR and Fraser, N and Aleiferis, PG and Malcolm, JS},
doi = {10.4271/2010-01-0618},
journal = {SAE Technical Paper Series},
title = {A Study of Alcohol Blended Fuels in an Unthrottled Single Cylinder Spark Ignition Engine},
url = {},
year = {2010}

RIS format (EndNote, RefMan)

AB - This work involved study of the effects of alcohol blends on combustion, fuel economy and emissions in a single cylinder research engine equipped with a mechanical fully variable valvetrain on the inlet and variable valve timing on the exhaust. A number of splash blends of gasoline, iso-octane, ethanol and butanol were examined during port fuel injected early inlet valve closing operation, both with and without variable valve timing. Under low valve overlap conditions, it was apparent that the inlet valve durations/lifts required for full unthrottled operation were remarkably similar for the wide range of blends studied. However, with high valve overlap differences in burning velocities and internal EGR tolerances warranted changes in these valve settings. In turn, it was concluded that high ethanol content blends facilitated minimum throttling at the inlet valve itself and the largest relative savings in terms of fuel consumption, engine-out emissions of NOx and (corrected) unburned hydrocarbons.
AU - Cairns,A
AU - Todd,AR
AU - Fraser,N
AU - Aleiferis,PG
AU - Malcolm,JS
DO - 10.4271/2010-01-0618
PY - 2010///
SN - 0148-7191
TI - A Study of Alcohol Blended Fuels in an Unthrottled Single Cylinder Spark Ignition Engine
T2 - SAE Technical Paper Series
UR -
UR -
ER -