Improving gas emission in 4-stroke small engine through systematic overhaul methodology

Shahurin, Shafarul Nizam (2018) Improving gas emission in 4-stroke small engine through systematic overhaul methodology. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

In order to overcome the non-systematic overhaul methodology and global warming nowadays, a systematic overhaul methodology in 4-stroke small engine and study and analyze compression and emission test results before and after overhauling process were performed. Overhaul process, measurement and inspection, compression and emission test were used in order to get the condition of the engine components and the gases produces before and after the overhauling process. The comparison of compression test results between before and after overhaul shows the improvement of pressure increased in the engine cylinder when the engine overhaul was completely done. Measurement and inspection of the engine components was intended to determine whether they work well or not. It also determined which components can be used again and which components need to be replaced. The emission test was run on the static motorcycle in neutral gear. The emission gases that produced from the combustion chamber in the condition of before and after overhaul process were determined by exhaust gas analyzer machine in the various engine RPM. The comparison data between these two conditions found that there have some gases were reduce and some gases were increased after the engine overhaul process was completely done. All the results were studied and analyze for further explanation. After all the experiments and data had been done and studied, the compression test was improved about 4.6% while the CO2, O2, HC were improved 33%, 16.5% and 30% respectively. The CO reading was slightly increased by 6.5%. This is because the improper carburetor adjustments.

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