画像:4-Stroke-Engine.gif

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

[edit] Detailed Description

1. Fuel and oxygen are injected
2. Fuel and oxygen are compressed and ignited
3. Fuel combusts and piston is pushed downwards
4. Exhaust is removed

"' when engine revs smoke comes out of the exhuast

[edit] 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) --85.182.123.226 20:58, 11 October 2006 (UTC)

"Also, the valve dimensions are not to the usual scale. The exhaust valve should be the larger of the two to facilitate removal of the increased volume of gas that expanded during the combustion process."

"The exhaust valve is never larger than the intake valve unless it is a three valve configuration. In the case of a three valve engine there would be two intake valves and one exhaust valve." IJB_TA

"The intake valves need to be larger than the exhaust valves, because the intake, in most cases, relies on atmospheric pressure to force fuel mixture into the cylinder. The exhaust can be released from the cylinder at very high pressure. (big fool, dec 2006)"

"Well, I have seen many engines, and some have both the same size, and some have the Exhaust larger, since as said above, the gases expand, so you have a larger volume leaving than entering. It can also depend on whether there is a turbo- or super-charger. I don't believe I have ever seen an engine with the intake valve larger however. I have not seen it all though... Just most! ;) ke6gwf"

Nope, that's never true. The intake valves always have more area, either by more intake valves or just larger ones. I believe it's because the intake charge has greater density. Also I'm sure the engine benefits more from being able to pull in more of an intake charge rather than to be able to push out more exhaust, which is never really a problem anyway. About the only thing I know of that could eliminate any doubt is here: LS7 information and pictures. IJB_TA

Pretty sure this engine would predetonate given the compression ratio and timing. Jason