An experimental study was conducted on a carburetted 2-stroke gasoline, 3-wheeler engine for operating on Compressed Natural Gas (CNG) in bi-fuel mode and further to run on dedicated CNG. Work involved design and development of a gas-air mixer for CNG, pumpless lubrication system for engine, cylinder heads for higher compression ratio, etc.
Moreover, the studies for optimising the spark timing for improving CNG engine performance and effect of higher compression ratio on CNG emission, BSFC, etc. was conducted.
Performance tests regarding power, BSFC, emission, etc. were conducted on baseline gasoline, bi-fuel CNG and dedicated CNG mode.
Engine test bed results show that, on bi-fuel mode power loss is around 14 to 19%, which can be reduced to 5 to 10% in dedicated mode.