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This paper presents experimental test results of a diesel engine using additive added bio Diesel oil obtained from palm oil. The test results obtained are brake power, specific fuel consumption (SFC) and exhaust emissions. In addition, anti-wear characteristics of fuel's contaminated lubricants were observed using a tribometer test. A computer control dynamometer-engine test bed was used to measure engine brake power and SFC at half throttle condition with speed range of 1000 rpm to 4000 rpm. The emission test was done with dynamometer fixed load of 50 Nm and constant engine speed of 2250 rpm. A total of three fuels or 100% diesel fuel (B0); 20% palm oil diesel (POD) and 80% B0 (B20); and B20 with X% additive (B20X) were selected for this investigation. The B20X is the additive added bio Diesel oil where X is the percentage (in this investigation X=1% of B20) of additive in B20 fuel.

This paper presents experimental test results of a new compressed natural gas direct injection (CNG-DI) engine that has been developed from modification of a multi cylinder gasoline port injection (PI) engine. The major modifications done are (1) the injection system has been modified to gas direct injection using new high pressure gas injectors, (2) compression ratio has been changed from 10 to 14 through modification of piston and cylinder head, and (3) new spark plugs with long edge were used to ignite the CNG fuel. The CNG pressure at common rail was kept at 20 bar to be injected into engine cylinder. The engine has been operated with full throttle conditions to compare all the results with original base engine such as gasoline port injection engine and the CNG bi-fuel engine where the base engine has been converted to bi-fuel injection system to be operated with gasoline and CNG fuels.