INTERNAL-COMBUSTION ENGINE - IN AN INTERNAL-COMBUSTION ENGINE THE COMBUSTION OF THE FUEL TAKES PLACE IN A CONFINED SPACE, PRODUCING EXPANDING GASES THAT ARE USED DIRECTLY TO PROVIDE MECHANICAL POWER., THE OTTO CYCLE - ALMOST ALL CARS CURRENTLY USE WHAT IS CALLED A FOUR STROKE COMBUSTION CYCLE TO CONVERT PETROL INTO MOTION. THE OTTO CYCLE CONSISTS OF FOUR STROKES., INTAKE STROKE - THE INTAKE VALVE OPENS TO ALLOW THE MIXTURE OF VAPORIZED FUEL AND AIR TO ENTER THE CYLINDER. THE PISTON MOVES DOWN AND THE MIXTURE IS PUSHED INTO THE CYLINDER., COMPRESSION STROKE - THE AIR/FUEL MIXTURE IS COMPRESSED BY THE CYLINDER WHICH IS MOVING UPWARD AND THIS INCREASES THE PRESSURE AND THE TEMPERATURE, POWER STROKE - AS THE PISTONS REACHES THE TOP OF THE CYLINDER, AN ELECTRIC SPARK IS PRODUCED BY THE SPARK PLUG. THIS SPARK IGNITES THE AIR/FUEL MIXTURE, THUS CREATING AN EXPLOSION. IN THE COMBUSTION CHAMBER AND THE PRESSURE, FORCING THE PISTON DOWN IN THE CYLINDER., EXHAUST STROKE - WHEN THE PISTON REACHES THE BOTTOM OF THE CYLINDER AGAIN, THE EXHAUST VALVE OPENS TO ALLOW THE BURNED GASES.,

FOUR-STROKE COMBUSTION CYCLE

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