File talk:4-Stroke-Engine.gif

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)


 * Is this gif supposed to be animated? All I see is a static image. 209.225.225.105 20:09, 24 August 2006 (UTC)


 * Looks very animated in my browser (Firefox on MacOSX)--J Clear 00:18, 25 August 2006 (UTC)

Infinite compression
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)
 * 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)
 * 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)
 * Please provide a source for this assertion. Bri2k1 08:06, 4 November 2006 (UTC)
 * 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)
 * 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)

Great work!!! That should really help the beginners recognizing the interior of the engine.

Chaitanya reddy {liveforchaitanya@yahoo.com} —Preceding unsigned comment added by 123.176.36.70 (talk) 02:55, 28 September 2007 (UTC)

Intake and Exhaust relative size
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)

Some notes to Bri2k1:
 * 1) Please don't edit other people's posts to the talk page. Especially when your edits introduce spelling mistakes for no apparent reason.
 * 2) If we had to provide sources for everything, nothing would ever get done. It's pretty clear that the triangular section on top of the cylinder is a mistake -- the animation would probably have benefited from a more complete understanding of the way an engine works, perhaps examining a running model, etc.  Which is OK, I don't want to disparage the contributor, he's put together some awesome models and this one is far, far better than a static image.  Just that it's obviously been modeled on a static image, then animated.  And the permanent gap above the piston was included with the piston.  Whatever.  These faults are pretty clear to engineer types like those you've attempted to shut down; there's no need to insult them by demanding references.  It's like asking a priest to show you which page of the bible the snake is on.
 * 3) Thanks for taking the time to contribute, you obviously mean well, just remember that this is a community and we need to get along. --pmj 14:35, 4 November 2006 (UTC)

4-Stroke-Engine.gif (comment)
this is a good representation of the 4 strokes of the engine operation and usually the crank rotation speed is constant in this type of animation. In this animation there is a noticeable acceleration of the crank rotation occurring but it is on the wrong cycle. It accelerates on the intake stroke when it should be on the power stroke at ignition.

Why Not Specify "Intake", "Compression", "Ignition", and "Exhaust" Vertically Opposite Numerical Assignations In Order To Impart Maximal Comprehension At Minimal Exposure To Material.

Description of Four Strokes
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)

The spark plug usually fires just before the end of the up stroke, so it is correct at the end of #2. How about: 1. Fuel-air mixture enters cylinder 2. Mixture is compressed and then ignited 3. Pressure of combustion fuel pushes piston down 4. Exhaust exits cylinder Zojj 07:21, 7 January 2007 (UTC)

Warnings and Comments
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)


 * 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)

Exhaust valves are never larger than intake valves. IJB TA 02:23, 8 January 2007 (UTC)

Image
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)Vinaq

Warnings etc
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)
 * 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)