Combustion and Emission Analysis of SI Engine Fuelled by Saudi Arabian Gasoline RON91 and RON95 with Variable Compression Ratios and Spark Timing

Binjuwair, Saud; Alkhedhair, Abdullah M.; Al-Harbi, Ahmed A.; Alshunifi, Ibrahem A.

doi:10.4236/oalib.1104184

Cited by 4 publications

(7 citation statements)

References 10 publications

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“…Brake thermal efficiency is a dimensionless measure of the engine's thermal performance divided by the total units of heat in the fuel burned. The following equation may be used to calculate thermal efficiency [9], [20]:…”

Section: Machine Performance Testmentioning

confidence: 99%

Experimental Study Influences Changes In Compression Ratio To Performance Of Single Cylinder Otto Engine

Juwana

Rachmanto

Wiyono

et al. 2022

Mekanika: Majalah Ilmiah Mekanika

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<span class="fontstyle0">Increasing the compression ratio is an attempt to increase the efficiency and performance of the engine. The purpose of the study was to analyze the effect of changes in the compression ratio on engine performance. Tests using a single-cylinder Otto engine by comparing the performance of an enlarged compression ratio of 9.7:1 and 10.4:1 with a standard compression ratio of 9.0:1. The result of the research is that the compression ratio of 9.7:1 produces a peak torque of 7.51 Nm at 6000 rpm, a peak power of 5.30 kW at 8000 rpm, and the lowest BSFC is 0.146 kg/kW.h at 6000 rpm. Torque and power increased by 0.09 Nm and 0.28 kW, and BSFC decreased by 0.018 kg/kW.h compared to the standard compression ratio of 9.0:1. Using a compression ratio of 10.4:1 produces a peak torque of 7.69 Nm at 6000 rpm, a peak power of 5.38 kW at 8000 rpm, and the lowest BSFC is 0.116 kg/kW.h at 6000 rpm. Torque and power increased by 0.27 Nm and 0.36 kW, and BSFC decreased by 0.030 kg/kW.h compared to the standard compression ratio of 9.0:1.</span>

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Section: Machine Performance Testmentioning

confidence: 99%

Experimental Study Influences Changes In Compression Ratio To Performance Of Single Cylinder Otto Engine

Juwana

Rachmanto

Wiyono

et al. 2022

Mekanika: Majalah Ilmiah Mekanika

View full text Add to dashboard Cite

show abstract

“…If the spark occurs too quickly, the piston will be slowed in its upward motion. On the other hand, if the spark is delayed, the piston will move downwards, so in both cases, the work done on the piston will be reduced [5].…”

Section: Volume 21 (2) 2022mentioning

confidence: 99%

Experimental Test of Ignition Timing with Programable CDI on Performance Single Cylinder Otto Engine

Rachmanto

Wijayanto

Juwana

et al. 2022

Mekanika: Majalah Ilmiah Mekanika

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<span class="fontstyle0">Ignition timing is sparking from the spark plug based on the ignition angle during the compression stroke in the combustion chamber relative to the piston position and the crankshaft angular speed. Adjusting the ignition angle is one method to optimize the combustion process in the engine. An optimal combustion process can improve engine performance and reduce fuel consumption. This study investigates optimal data from ignition angle changes using a programmable CDI. The test was performed on a single-cylinder fourstroke Otto engine with standard ignition angle variations, +3°, +6°, and +9° before TDC. The test results show that torque and power have increased while brake-specific fuel consumption has decreased. Optimal data acquisition at ignition angle of +9° with peak torque value of 6.91 Nm and peak power value of 4.80 kW, while the lowest value of specific fuel consumption is 0.234 kg/kWh, and the highest value of thermal efficiency is 36 %. From this study, it was concluded that the ignition timing could affect the engine performance.</span>

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“…The ratio of the maximum piston volume to the minimum compressed volume is called the compression ratio. Varying compression ratios offer a diverse potential of combustion efficiency, which can be translated to torque and horsepower under varying loads and speed conditions [13,14]. The compression ratio is defined as the difference between the volume in the combustion chamber above the piston when the piston is at the bottom dead centre (BDC) to the piston at the top dead centre (TDC) [15].…”

Section: Compression Ratiomentioning

confidence: 99%

“…There are many causes of pre-ignition and one of them is the type of fuel used in the experiment. Binjuwair et al [14] found that in comparing between RON 95 and RON 91, RON 91 showed better performance by 0.54 % at a compression ratio of 10.5:1. In this experiment, only fuel type…”

Section: Power and Torque For Low And High Compression Pistonmentioning

confidence: 99%

The Effect of Compression Ratio by Different Piston Head Shape on the Performance of Motorcycle Engine

Katijan¹,

Kamardin²

2019

IJAME

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The compression ratio has a significant impact on engine power, fuel economy, emission, and other performances of internal combustion engines. Basic engine theory states that a higher compression ratio produces higher torque and horsepower. One way of having different compression ratio is by changing piston head shape. A piston is a cylindrical engine component that slides back and forth in the cylinder bore via forces produced during the combustion process. The piston acts as a movable end of the combustion chamber transmitting power generated from the burning of fuel and air mixture in the combustion chamber. The objective of this study is to compare the engine performance in horsepower and torque produced by the different shapes of the piston head in an internal combustion engine. Three pistons with different head shapes - standard, mug (low compression) and dome (high compression) with a compression ratio of 8.8:1, 7.61:1 and 10.06:1 were selected for the study. An experiment was also performed to a standard piston installed with 1.5 mm gasket, which has a compression ratio of 7.31. The experiments were carried out using a standard internal combustion engine of a Honda EX5 motorcycle. The engine runs on a chassis dynamometer to measure its torque and horsepower. Piston performance was evaluated based on the maximum available torque and horsepower. The result shows that all three pistons produce different torque and horsepower. The domed piston head produces higher torque and horsepower followed by the standard and mug. By just changing the piston head shape, torque and horsepower increased up to 7.14% and 20.05% respectively.

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Combustion and Emission Analysis of SI Engine Fuelled by Saudi Arabian Gasoline RON91 and RON95 with Variable Compression Ratios and Spark Timing

Cited by 4 publications

References 10 publications

Experimental Study Influences Changes In Compression Ratio To Performance Of Single Cylinder Otto Engine

Experimental Study Influences Changes In Compression Ratio To Performance Of Single Cylinder Otto Engine

Experimental Test of Ignition Timing with Programable CDI on Performance Single Cylinder Otto Engine

The Effect of Compression Ratio by Different Piston Head Shape on the Performance of Motorcycle Engine

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