ArticlePerformance parameters of different commercial diesel fuels is a subject of interest for
fuel consumers. Fuel retailer Neste recently introduced a new brand of WWFC 5th grade diesel
fuel in Baltic market, consisting of diesel fuel and hydrotreated vegetable oil (HVO) blend. Fuel
samples have been recently tested on chassis dynamometer, measuring wheel power and torque
and in road conditions, measuring fuel consumption. Evaluation of fuel consumption and
performance parameters in road or laboratory conditions may yield uncertain results due to
complexity of modern automobile engine management and emission reduction systems. To better
evaluate the combustion, fuel samples have been tested in modified CFR engine at various intake
air pressure, temperature and compression ratio settings. Engine indicated performance
parameters and combustion phasing of regular diesel fuel and diesel fuel-HVO blend are
presented. Comparing to regular diesel fuel, fuel blend with HVO showed reduced apparent heat
release rate (AHRR) during premixed combustion phase at low inlet air temperature and low
compression ratio conditions, comparing to regular diesel fuel. Premixed combustion phase
AHRR of diesel-HVO blend increased above AHRR of regular diesel fuel at higher inlet air
temperature and higher compression ratio conditions. Diffusion controlled combustion phase
AHRR of diesel-HVO blend increased above AHRR of regular diesel fuel at higher inlet air
temperature, higher compression ratio conditions and supercharged air supply
