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How an Engine Works

How an Engine Works. 3 -11-13. The 4 Steps of Combustion. Intake. Any time your car is running the crankshaft is turning, and as it turns it pushes and pulls on cranks connecting it to the pistons in the cylinders of the engine.

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How an Engine Works

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  1. How an Engine Works 3-11-13

  2. The 4 Steps of Combustion

  3. Intake • Any time your car is running the crankshaft is turning, and as it turns it pushes and pulls on cranks connecting it to the pistons in the cylinders of the engine. • During the first step in the cycle, the induction stroke, the crank pulls the piston down, reducing the pressure in the cylinder. • The fuel injector/carburetor sprays fuel into the air stream and the intake valve leading into the cylinder opens so the low pressure in the cylinder can suck the fuel and air in.

  4. Compression • The intake valve closes so the fuel and air are trapped inside. • As the crankshaft continues to turn, the piston surges up the cylinder, squeezing the fuel-air mixture into a very small space. • During this stage and the next, the exhaust valve remains closed, and the fuel injector ceases to fire.

  5. Spark • The power stroke is where the real action begins. It starts once the volume in the cylinder has reached its minimum point. At that moment, the spark plug in the cylinder fires, and the spark ignites the fuel-air mix, triggering a rapid explosion. • The force of this explosion drives the piston back down the cylinder. The piston pushes on the crank as it descends.

  6. Exhaust • The exhaust valve opens at the top of the cylinder. Driven by the rotating crankshaft, the piston ascends the cylinder, forcing the waste gas out the valve and into the exhaust system. • In the meantime, the cylinder begins the induction stroke anew and repeats the cycle.

  7. 4-Stroke Engine

  8. Crankshaft and Piston 3-11-13

  9. Crankshaft

  10. Parts of a Crankshaft

  11. Parts of a Piston

  12. FINGER TEST!!! • What happens when you runs your hands over each other really fast? • GO AHEAD AND TRY IT!!

  13. Engine Explosion • Engine Explosion#1 • Engine Explosion#2

  14. Friction

  15. Bearings and Tolerances • Bearings come in many different shapes and sizes • Tolerance is: thecapacity to endure continued subjection to something

  16. Where do you think there are bearings?

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