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This study describes the development of engine test applicable to motorcycles. Due to the dramatically stringent of emission regulation, the aim of this development is to develop the engine test specifically for motorcycles based on the unconventional fuel, of which test results is comparable to field trial test results. Furthermore, this developed engine test is able to distinguish the engine oil in each performance level. Resulting in this comparison the newly development of engine test is comparable to field trial in aspects of detergency, anti-wear performance, and oil consumption.

Biodiesel is widely used as a diesel component worldwide as well as in Thailand. Even there are so many research papers studied about biodiesel combustion, performance and emission, the various sources of biodiesel and engine technologies makes it more complicated to conclude how biodiesel combustion react to the engine behavior, especially for transient state operation. Some of biodiesel user feels that the presence of biodiesel component in diesel fuel influence on poor engine driveability even only 5% V/V. While, there is a few publications comment on the low sensitivity of diesel fuel ignition delay quality when running with advance diesel common-rail DI engine. The first experiment was done on low pressure diesel combustion which represented the conventional diesel technology, aiming to study the effect of fuel injection pressure on biodiesel combustion. The results shown that, the higher content of biodiesel blended fuel has no significant effect on diesel combustion.

Diesel Dual Fuel (DDF) operation is a promising alternative engine operating mode. Previous research studies have reported a DDF engine operating under low load conditions suffers from high HC emissions, mostly Methane. The current study investigated the use of a multiple direct injection strategy for improvement of low-load DDF operation in a commonrail direct injection single-cylinder diesel engine. Natural gas was supplied at 70% of energy replacement ratio. Results indicated that depending on engine conditions, a double-pulse injection had potential for combustion control and provided an effective way to reduce NOx and methane emissions. Moreover, the double-pulse injection helped improve the combustion stability, reduce the pressure rise rate, and decrease the maximum cylinder pressure, compared to DDF operation with a single pulse injection.

A study of one of the first batches of local low sulphur diesel fuels was conducted in order to determine the fuel's lubricity effects on VE rotary pump performance. This study involved a 30,000 km accumulation field test. Two types of fuels were used. Both were not additised with lubricity improvers. The first fuel, with HFRR WSD value of 358 μm, was used on three test vehicles, each fitted with new VE rotary pumps. The other fuel (HFRR value of 467 μm) was used with the other three test vehicles, each fitted with new pumps that were evaluated prior to field use. Camplate, cam-roller, pins and flyweight were evaluated after completing 30,000 km. No evidence of abnormal wear was found for all six pumps. However, slight but noticeable differences were found between pumps running on Test Fuels 1 and 2. These differences were found in flyweight stroke and axial wears. Despite these differences, the pumps were considered to be capable of further use.