Effects of Monograde and Multigrade Oils on the Friction Force in Four-Stroke Motor Engine: An Experimental and Analytical Approach

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In this work computational models with measured friction on a motor of four stroke engine are compared. The piston ring friction was experimentally measured under different conditions on a single-cylinder gasoline engine, using strain gauges along to the cylinder liner.This method doesn’t require any great engine modification, so the piston ring-cylinder friction reflects the reality. The experimental results for different grade type of oils (SAE 30, SAE 10w40), were compared with the numerical predictions, and presented.