File talk:4-Stroke-Engine.gif

message: This is a four stroke engine. If you notice the inging is moving. And it has in the box labeled 1, 2, 3, and 4. It is showing you the four strokes.
:What in the world is an "inging?"  That particular word does not appear to be defined. Bri2k1 08:06, 4 November 2006 (UTC)
replies: text: Is this gif supposed to be animated? All I see is a static image. 209.225.225.105 20:09, 24 August 2006 (UTC)
replies: text: Looks very animated in my browser (Firefox on MacOSX)--J Clear 00:18, 25 August 2006 (UTC)

message: Perhaps "it's a hemi", allowing it to compress into depressions in the cylinder head not visible in the GIF.  Yeah, that must be it.--J Clear 03:15, 13 June 2006 (UTC)
replies: text: The hemispherical combustion chamber design of a [hemi] engine doesn't require these invisible depressions.  In fact, the primary outward visual portrayal (in 2D or 3D) would be the inline orientation of the valves. Bri2k1 08:06, 4 November 2006 (UTC)
replies: text: That would not be a very efficient combustion chamber. The image would be much improved if the dome on the piston was removed. PerDaniel 17:47, 15 July 2006 (UTC)
replies: text: Please provide a source for this assertion. Bri2k1 08:06, 4 November 2006 (UTC)
replies: text: I agree.  It does need to be fixed.  The dome makes no sense.  I have never seen a domed piston like that. Culverin?  Talk  11:15, 31 October 2006 (UTC)
replies: text: The claim that you have not seen such a design does not detract from its existence nor effectiveness.  Please provide a source for such an assertion. Bri2k1 08:06, 4 November 2006 (UTC)
thread_title:  Infinite compression 

message: In the vast majority of engines the intake value is larger in diameter than the exhaust.  This provides for greater overall volumetric efficiency because the maximum pressure differential available on intake is 1 atmosphere (~ 15psi) whereas exhaust is under combustion pressures and driven by the positive displacement on the rising piston head which is limited only by the available power at the crank. 72.184.102.71 20:40, 4 November 2006 (UTC)
thread_title:  Intake and Exhaust relative size 

message: I think there is a better way to word the strokes. 
I would word the strokes as follows
  1. The fuel air mixture enters the cylinder
  2. The mixture is compressed.
  3. The spark plug fires and the high pressure of burning fuel pushes the piston back down.
  4. Exhaust is pushed out to prepare the cylinder for the intake stroke again.
Here are my explanations
  1. Air and fuel really aren't "injected on the intake stroke"  
  Usually when people talk about "injection" they are talking about the fuel injector.  The air and fuel are mixed by a carburetor or 
  fuel injector(s) which aren't shown in the diagram.  The air fuel mixture is drawn into the cylinder or more accurately pushed 
  because   of the lower pressure created by the increased volume due to the piston moving down in the cylinder.
  2. The second stroke does not include ignition.
  3. basically no difference
  4. Thought it was worth connecting exhaust with intake
Xpanzion 18:41, 1 December 2006 (UTC)
thread_title: Description of Four Strokes

message: The current article states "The exhaust valve should be the larger of the two to facilitate removal of the increased amount of gas formed from the combustion process."  Should this be changed to "...to facilitate removal of the increased volume of gas that expanded during the combustion process."?Frito 08:54, 4 November 2006 (UTC)
replies: text: Its usually the Inlet valve which is the larger of the two valves , to get more air fuel mixture there in the first place.--Timdennis 14:24, 4 November 2006 (UTC)
thread_title:  Warnings and Comments 

message: The image clearly does what it supposed to do. This was a big help for my project. Thank You!Vinaq 17:16, 27 February 2007 (UTC)
thread_title:  Image 

message: I was trying to move the section Warnings and Comments from the image page to discussions page (since this is the right place for such discussions). But it did not work (I am not an expert wiki editor). It seems that it happened on wikimedia commons but not on this wikipedia page. It will be nice if someone else can do that. Thanks. 198.62.10.11 (talk) 05:05, 14 December 2007 (UTC)
replies: text: Hey it happened automatically now. It seems either I was seeing a cached page or it takes some time for wikipedia pages to get refreshed or synchronized with the wikimedia commons.  —Preceding unsigned comment added by 198.62.10.11 (talk) 05:21, 14 December 2007 (UTC)
thread_title:  Warnings etc