When it comes to diesel engines the compression ratio has its greater significance as. The petrol engine usually comes with 10:1 to 14:1 compression ratio depending upon the application and design requirement. The petrol engine with proper CR provides a balanced amount of power and speed.The pressure inside the cylinder increases during compression stroke which in turn raises the temperature of the air-fuel mixture that leads to complete or proper combustion of the fuel when the spark plug produces spark which in turn provides better fuel economy and also prevents the engine from various defects like knocking.As we all know the in petrol engine air-fuel mixture enters the combustion chamber during the suction stroke and for proper mixing and for proper combustion of this air-fuel mixture compression of this mixture is required which is done by the engine in its compression stroke, so a good compression ratio of the petrol engine is required for proper combustion of the air-fuel mixture which in turn provides better thermal efficiency.If we talk about 4-stroke petrol engine the compression ratio has its own significance that are. So the compression ratio of this engine will be 1000:100 or 10:1. the volume left inside the cylinder when the piston reached to its TDC. the volume covered by the piston when it moves from BDC to TDC, and having 100cc clearance volume i.e. In simple words, it is the ratio between the total volume of the combustion chamber which is left when the piston is at its bottom dead center and the volume left inside the combustion chamber when the piston moves to its top dead center.įor example- Let’s consider an engine having 1000cc total volume out of which 900cc is the swept volume i.e. Now let’s just ponder, Are there any effects of cylinder size on the engine’s power output? What effects do the engine configuration like cubic capacity made on engine’s output? What is Compression Ratio?Ī compression ratio (CR) of an I C engine is the ratio of the total volume of the combustion chamber To the volume left after complete compression i.e. We often talk about the power output when it comes to internal combustion engine, from over a century various research have been conducted to study and to modify the factors affecting the power output of an IC engine, the configuration of the engine like CC, is decided after these various research. Design Criteria on which the compression ratios depend.What is the Need for Compression Ratio?.
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