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Animated scheme of a four stroke internal combustion engine, Otto principle.

Detailed Description

  1. Air and vaporised fuel are drawn in
  2. Fuel vapor and air are compressed and ignited
  3. Fuel combusts and piston is pushed downwards
  4. Exhaust is driven out

Warnings & Comments

Warning: This animation is not completely accurate. There should be some space left when the piston is at its highest position. The current animation suggests infinite compression.

Comment: This is a 2D projection of a 3D model. The little space went lost in the pixels of the outlines. And a 2D projection is not able to show the space around the "roof" of the piston. (UtzOnBike) -- 20:58, 11 October 2006 (UTC)

Comment: Ignition of the air-fuel mixture does not occur exactly at TDC, rather a short time before the piston reaches Top Dead Centre. This is commonly referred to as BTDC and is expressed in a number of degrees of the crankshaft rotation, i.e. 8 degrees BTDC.

The ignition point varies with engine rpm. An engine rotating at such a slow speed as the one in the animation would definitely not fire at 8 degrees BTDC. IJB_TA

Comment: It would be nicer to show the intake and exhaust by moving clouds instead of the abrupt colour changes. 17:46, 18 February 2007 (UTC)

If you don't like it make a new one. IJB_TA

Comment: I removed "injected" from the Description because this does not appear to be a fuel-injected motor. 17:46, 18 February 2007 (UTC)

Why do people feel the need to endlessly criticize this animation? It shows the 4 stroke cycle VERY clearly, what else do you want? IJB_TA

I agree with the person above my comment. The picture is an excellent example of a four strike engine. Anyone who did try to make a diagram would fail miserably.17:20, 27 February 2007 (UTC)Vinaq

Hey Vinaq, is it a good exaple of a four-strOke engine then too! Oh and I reckon arrows would be ace too. Amt

Hi...I agree with you IJB_TA & Amt. The main point is to demonstrate visually what is a 4 STROKE CYCLE like. Great work UtzOnBike! *zaidi*


Source: self-made: UtzOnBike (3D-model & animation: Autodesk Inventor)

GNU head Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled " GNU Free Documentation License".

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The following pages on the English Wikipedia link to this file (pages on other projects are not listed):
  • Engine
  • Internal combustion engine
  • Camshaft
  • Four-stroke cycle
  • Wikipedia:WikiProject Automobiles
  • Cylinder (engine)
  • User talk:TomStar81/Archive 1
  • Talk:Interlace
  • Motorcycle engine
  • User:Cyde/Featured pictures
  • Wikipedia:Featured pictures thumbs 05
  • Single cylinder engine
  • Wikipedia:Picture of the day/November 2006
  • Wikipedia:Featured picture candidates/February-2006
  • Wikipedia:Featured picture candidates/Internal Combustion Engine
  • Wikipedia:Wikipedia Signpost/2006-02-27/Features and admins
  • User talk:Ryan Josh
  • Wikipedia:WikiProject Automobiles/Featured articles
  • Portal:Energy/Selected article/Archive
  • Wikipedia:Picture of the day/November 4, 2006
  • Wikipedia:POTD/November 4, 2006
  • Wikipedia:POTD column/November 4, 2006
  • Wikipedia:Featured pictures/Engineering and technology
  • User talk:PotatoMan01/archive/archive/03
  • User:Andy120290
  • User:Saifudinbahrudin
  • Portal:Energy/Selected article/Drafts