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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.

The idea of using biodiesel as substitute fuel for fossil diesel is promising. The boom in biodiesel, however, has raised increasing concern about food shortage throughout the world and may translate into a food crisis. To avoid using food resources for fuel purposes, huge emphasis is currently being put on shifting to alternative non-food feedstocks including waste cooking oils. This study investigated the effects of biodiesel derived from waste palm oil-based cooking oil on performance, exhaust emissions and combustion characteristics in a light duty compression ignition engine. A total of three sets of fuel blends were studied: 10%, 20% and 30% volumetric blends (B10, B20 and B30) of waste cooking oil methyl ester (WME) with fossil diesel. In this study, the experimental work was carried out with a single cylinder, four-stroke, direct injection compression ignition engine. The experiments were conducted under constant torque of 20 Nm and at five different engine speeds.

This paper presents an experimental result carried out to evaluate exhaust gas emissions and deposit characteristics of a small diesel engine when operated on preheated crude palm oil (CPO) and its emulsions with 1%, 2% and 3% water. Non preheated CPO was not used in this investigation. The test was conducted for 100 hours using each of the test fuels with a constant speed of 2700 rpm and 5.50 Nm load. The engine was disassembled after the test to scrape carbon deposits from piston and cylinder heads. Ordinary diesel fuel (OD) scrape was used for comparison purposes. It was observed that preheated CPO reduced exhaust emissions such as containing less CO, HC and PM as compared to OD and CPO emulsified fuels. This is mainly attributed to the fact that preheating of CPO reduces its viscosity to the level of OD that improves the fuel spray and atomization characteristics as well as produces complete combustion.

The use of diesel engines is increasing rapidly thanks to their superior fuel economy, higher efficiency and excellent reliability. The energy crisis of fossil fuel depletion, rising price of diesel and environmental degradation have triggered a search for clean, sustainable and alternative fuels for internal combustion engines. Biodiesel is one of the most promising and demanding alternative fuels because it is a biodegradable, non-toxic and renewable fuel. In the present work, an experimental investigation on the effect of injection timing on engine performance, emissions and combustion characteristics with coconut oil methyl ester (CME) was conducted in a high-pressure common-rail direct injection diesel engine. The tests were performed at constant speed of 2000 rpm and 50% throttle position operation. The test fuels included baseline diesel fuel and two different fuel blends of CME (B20 and B40).

This paper presents the results of an experimental work carried out to evaluate the combustion and emission characteristics of ordinary coconut oil (COIL) blended fuel on unmodified indirect injection (IDI) diesel engine. Diesel fuel (DF2) was used for comparison purposes. The test results on coconut oil blended fuel showed that the addition of up to 30% coconut oil with DF2 has significantly increased brake power and net heat release rate with a net reduction in exhaust emissions such as HC, NOx, CO, smoke and poly-cyclic aromatic hydrocarbons (PAH). This means that COIL blended fuel has similar ignition quality as DF2, and indeed better combustion. However, COIL blended fuel increases specific fuel consumption due to higher specific density of coconut oil. When more than 30% of coconut oil is added (40% - 50%), the brake power produced and the net heat release rate are slightly less due to low internal energy, but better combustion still takes place.

Palm is an edible feedstock which is immensely popular in Malaysia as an alternative fuel which can substitute diesel fuel. However, use of Palm biodiesel in diesel engine have a negative effect on food security, thus, in this study authors used Mustard biodiesel, which has poor fuel properties, with Palm biodiesel to produce an optimum blend. This blend will have better fuel properties compared to Mustard biodiesel and will help eliminate dependency of Palm biodiesel. To ensure that optimized blend achieves better fuel properties MATLAB optimization tool was used to find out the optimum blend ratio. Linear relationship among the fuel properties was considered for MATLAB coding. The resultant optimum blend is represented by PM. Optimum blend revealed improved fuel properties compared to mustard biodiesel.