Some investigations in design of low cost variable compression ratio two stroke petrol engine

TL;DR

This paper presents a novel, low-cost method for variable compression ratio in two-stroke petrol engines, enabling drivers to adjust compression ratios and improve efficiency, with analysis through experimental testing and computational simulation.

Contribution

Introduces a simple, cost-effective technique to alter compression ratio by inserting a metal plug, allowing variable compression in two-stroke engines.

Findings

Higher compression ratios increase fuel efficiency.

Engine performance improves with compression ratio adjustments.

Combustion analysis via FLUENT shows detailed gas behavior.

Abstract

Historically two stroke engine petrol engines find wide applications in construction of two wheelers worldwide, however due to stringent environmental laws enforced universally; these engines are fading in numbers. In spite of the tight norms, internationally these engines are still used in agriculture, gensets etc. Several designs of variable compression ratio two stroke engines are commercially available for analysis purpose. In this present investigation a novel method of changing the compression ratio is proposed, applied, studied and analyzed. The clearance volume of the engine is altered by introducing a metal plug into the combustion chamber. This modification permitted to have four different values of clearance value keeping in view of the studies required the work is brought out as two sections. The first part deals with the design, modification, engine fabrication and testing at different compression ratios for the study of performance of the engine. The second part deals with the combustion in engine using FLUENT and analysis of exhaust gases. Increase in compression ratio improves fuel efficiency and power output. The novelty in this work is to permit the two wheeler driver to change the compression ratio.