Date of Publication

4-2025

Document Type

Master's Thesis

Degree Name

Master of Science in Mechanical Engineering

Subject Categories

Engineering | Mechanical Engineering

College

Gokongwei College of Engineering

Department/Unit

Mechanical Engineering

Thesis Advisor

Dr. Jose Bienvenido Manuel B. Biona

Defense Panel Chair

Engr. Jeremias A. Gonzaga

Defense Panel Member

Dr. Robby B. Manrique

Engr. Isidro Antonio V. Marfori III


Abstract/Summary

This study investigates the relationship between piston ring end gap sizes and diesel engine performance metrics, focusing on how variations in end gap sizes impact exhaust gas temperature (EGT), crankcase pressure, and engine vibrations across different operational speeds. Utilizing an Isuzu C190 engine, comprehensive controlled experiments were conducted to provide deep insights into the combustion and mechanical processes affected by piston ring end gap adjustments and their effects on engine efficiency. The findings reveal a direct correlation between increased piston ring end gap sizes and reduced EGT, indicating decreased combustion efficiency due to compromised sealing capabilities. Larger end gaps also result in minimal variations in crankcase pressure at higher operational speeds. The results indicate that crankcase pressure is an ineffective metric at detecting early piston ring end gap failure. Variations in piston ring end gaps also influenced significant changes in vibration frequencies, particularly at lower speeds. These results underscore the potential of using exhaust gas temperature as a diagnostic indicator for the early detection of piston faults. The researcher concluded that exhaust gas temperature (EGT) is an effective metric at detecting early piston ring end gap failure at every operational speed. This research significantly contributes to the automotive field by enhancing the understanding of how critical engine components such as piston rings influence overall engine behavior. The detailed analysis of the impact of piston ring end gaps provides valuable insights that can help improve diagnostic approaches. The study advocates for further exploration into the complex relationships between engine components and performance metrics.

Keywords: Diesel Engine Performance, Piston Ring End Gaps, Exhaust Gas Temperature (EGT), Crankcase Pressure, Engine Vibration Analysis

Abstract Format

html

Language

English

Format

Electronic

Keywords

Diesel motor; Diesel motor—Pistons

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