How an engine works
Sponsored Links
This presentation is the property of its rightful owner.
1 / 16

How an Engine Works PowerPoint PPT Presentation


  • 158 Views
  • Uploaded on
  • Presentation posted in: General

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.

Download Presentation

How an Engine Works

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


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.

  • 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.


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.


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.


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.


4-Stroke Engine


Crankshaft and Piston

3-11-13


Crankshaft


Parts of a Crankshaft


Parts of a Piston


FINGER TEST!!!

  • What happens when you runs your hands over each other really fast?

  • GO AHEAD AND TRY IT!!


Engine Explosion

  • Engine Explosion#1

  • Engine Explosion#2


Friction


Bearings and Tolerances

  • Bearings come in many different shapes and sizes

  • Tolerance is: thecapacity to endure continued subjection to something


Where do you think there are bearings?


  • Login