Improvement of IC Engine Performance by Piston Ring Design having Temperature Controlled Clearance

Piston rings and cylinder wall has a snug fit in modern passenger/commercial vehicles to provide an efficient seal but in Formula One Race cars, they have more precise machined pistons and almost an interference type fit which helps to produce more power than the same swept volume capacity passenger/commercial vehicles but it does have a detrimental effect which is to start an F1 engine it has to overcome the friction between the cylinder wall and piston rings to do that one needs to preheat the engines and run hot engine oil throughout and F1 also requires a heavy-duty starter motor to start the engine. Because of such costly precision machining and unjustifiable engine ignition method, these are not recommended for passenger vehicles. So, the objective is to design such a piston ring assembly that could have the advantages of F1 car engines but does not have to undergo such a long-time-taking procedure to start the engine. It is done by cleverly designing temperature-controlled piston rings which expand radially when the engine achieves optimum engine temperature so during the cold start stage of the engine, piston rings offer a snug fit hence low cylinder wall friction and as engine temperature goes up, the radial clearance decreases simultaneously thereby creating a more efficient seal.