Evrimata: Journal of Mechanical Engineering

The Effect of a Mixture of Gasoline and Ethanol in a Direct Injection System Engine on Power and Specific Fuel Consumption

Fina Rizqiani — 2024-07-06

The use of fossil fuels as the main fuel for vehicles is one of the problems in the automotive industry, considering that supplies are increasingly running low. The use of renewable fuel is an alternative in dealing with this problem, one of which is the use of ethanol as a gasoline fuel mixture. Ethanol which can be obtained from plants is more promising in terms of energy sustainability, and the high octane value of ethanol allows for increased combustion efficiency and can produce optimal engine power. This research identifies the influence of gasoline-ethanol mixture and engine speed on power and specific fuel consumption in direct injection engines. The research was carried out by testing the power of an electric generator driven by a 1-cylinder direct injection engine, as well as calculating fuel consumption while the engine was operating. The results of this research show that the E10 produces the best performance at low and medium revs with the highest power of 0.119 kW and 0.490 kW, while the E5 is superior at high revs with a power of 0.644 kW. In terms of fuel efficiency, E15 has the lowest SFC at low speed (3.83 L/kWh), E10 at medium speed (0.96 L/kWh), and E5 at high speed (0.77 L/kWh). E20 shows the lowest efficiency in all runs. The results of this research can be used to design direct injection engines with mixed fuels consisting of gasoline, ethanol and diesel

The Effect of Different Octane Number on Power and Specific Fuel Consumption in Gasoline Compression Ignition Engine

Mohammad Adam Fernanda — 2024-07-14

Internal combustion motors are a type of engine used as the main source of power for transportation equipment. This engine functions to convert heat energy into kinetic or motion energy. Compression ignition (CI) utilizes the increase in temperature and pressure during compression to ignite the fuel. The octane number or research octane number (RON) indicates the maximum pressure that can be received before gasoline burns itself. A lower octane number increases the likelihood of detonation of the fuel. Gasoline with a higher octane number is basically designed to prevent premature ignition or auto ignition of the gasoline in the engine. This research focuses on the power and specific fuel consumption of gasoline compression ignition engine at each variation in fuel octane number and engine speed. The fuel used is a mixture of 94% gasoline and 6% diesel fuel. The highest average power results at an engine speed of 1900rpm from 90, 92 and 95 octane fuel respectively are 0.475 kW, 0.728 kW and 0.764 kW. The average results of specific fuel consumption at 1900 engine revolutions were obtained for fuel with octane numbers of 90, 92, and 95 respectively at 0.92 L/kWh, 0.91 L/kWh, and 0.65 L/kWh.

The Effect of Combustion Chamber Volume and Engine Rotation on Temperature and Compression Pressure of Single Cylinder Diesel Engine

Sigit Prasetyo — 2024-07-14

The effect of combustion chamber volume and engine rotation on the temperature and
compression pressure of this single-cylinder diesel engine aims to convert the use of diesel
fuel in diesel engines into gasoline fuel by utilizing high compression without using the
help of spark plugs during ignition. The main focus of the study is to understand the effect
of variations in combustion chamber volume and engine rotation on temperature and
compression pressure in order to find optimal operating conditions. The General 170fd
single-cylinder diesel engine was used as the object of research. The testing tools used
include the TC-08 Thermocouple sensor module, the thermocouple sensor, and the
pressure gauge to measure the temperature and compression pressure. The research was
carried out using various gasket thicknesses, namely 0.6mm, 0.8mm, 1.4mm, 1.6mm, and
1.8mm to vary the volume of the combustion chamber. The data collected was analyzed
to determine the relationship between changes in the volume of the combustion chamber
and engine rotation to the temperature and compression pressure. The results of the study
are expected to provide insight into the ideal conditions for gasoline ignition in diesel
engines without the use of spark plugs, as well as contribute to efforts to optimize the use
of alternative fuels. The results of the experiment showed that variations in the volume of
the combustion chamber and engine rotation had a significant impact on the temperature
and compression pressure. The determination of the appropriate temperature and
compression pressure is expected to improve the efficiency and performance of diesel
engines when using gasoline fuel, thereby reducing operational costs and increasing the
flexibility of engine use in various applications. This research makes an important
contribution to the understanding of diesel engine modifications for gasoline fuel use,
which can be applied without testing exhaust emissions, with a focus on ideal temperature
and compression pressure.