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1557252 
Journal Article 
Comparative evaluation of performance, emission, lubricant and deposit characteristics of spark ignition engine fueled with CNG and 18% hydrogen-CNG 
Mathai, R; Malhotra, RK; Subramanian, KA; Das, LM 
2012 
Yes 
International Journal of Hydrogen Energy
ISSN: 0360-3199 
37 
8 
6893-6900 
WOS:000303952300062 
Gaseous fuels such as CNG and hydrogen are promising
alternative fuels which receive more attention all over the world. This paper investigates the
effect of compressed natural gas (CNG) and 18% hydrogen blended compressed natural gas (HCNG) on
a retrofitted gasoline genset engine's performance, emissions, deposits and lubricants under
long duration testing. During the 60 h test, lower BSFC, CO and HC are observed for HCNG with the
penalty of NOx values. The deposits of iron on spark plug and cylinder liner are higher for HCNG
compared to CNG. As kinematic viscosity and TBN values of lubricant decreased significantly with
HCNG, it has resulted in higher concentration of wear metals (iron and copper) in the used oil.
Copyright (C) 2012, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights
reserved. 
HCNG; Endurance test; Deposits; Lubricant analysis