According to the research entitled “the innovative engine prototype powered by diesel and LPG as fuel for agricultural” in 2019 the problems found while using the engine were as follows: the accumulated heat in the auxiliary combustion chamber reached 300 C in case of gasoline engine use and a lot of black smoke in the exhaust was found at the speed higher than 1800 rpm in case of a diesel engine use. In order to extend the research and solve two foresaid problems the objectives of this study were 1) to develop an auxiliary combustion chamber for cooling 2) to develop a scalable gas-air mixing device and 3) to compare diesel and LPG consumption rates by modifying a small diesel engine Yanmar version TF120DI to install LPG fuel systems and ignition system. In addition a gas-air mixing device was modified while an auxiliary combustion chamber was developed to reduce the compression ratio to the same level as the gasoline engine for replacing the position of the original diesel fuel injector. This method could support LPG fueling only whose function was characterized by the function of a gasoline engine. The auxiliary combustion chamber could be removed and then installed a diesel injector to return using diesel fuel. From an experiment to compare the modified engine operating as a gasoline engine it was found that the temperature of the auxiliary combustion chamber and the temperature of the engine cylinder head of Honda GX160 were measured at the maximum speed of 182 C and 186 C respectively. It was found that carbon monoxide content was 0.41 % and 1315 ppm hydrocarbons. When used as a diesel engine it was found that the black smoke was exhausted at 1.5 % which was similar to the diesel engine before the modification. From the experiment of using the power engine for pumping water with an Irrigation propeller pump with the diameter of 8 inch at a constant engine speed of 1000 rpm it was found that the average diesel usage was 0.65 kg/hr or about 0.77 L/hr with the cost of 21.00 Baht/hr and if using LPG as fuel the average LPG consumption was 0.57 kg/hr with the cost of 13.71 Baht/hr which could save up to 34.71 % of costs.

The research objectives were to establish and evaluate the graduates competence in the programme of bachelor of science in industrial education (mechanical engineering) of King Mongkut’s University of Technology Thonburi. The research tools were functional map by 12 specialists. Data inspection of quality by finding specialists ‘s index of consistency (IOC). The data was analyzed by statistic as percentage and F-test. Population groups were 55 students of the fifth year. The research results were as following 1) The establishment of the graduates competence consisted of 1 key purpose 2 key roles 6 key functions 25 units of competence and 423 elements of competence. 2) The evaluation of the graduates competence by using theory test as following : The units of competence of applied teaching were score average 63.12% basic mechanic and applied mechanic were score average 63.99% automotive technology were score average 63.07%. As the result of F-test that the testers of 3 units of competence were difference at significance level 0.05.