Talk:Piston
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I want to move piston by magnetic force please help me
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[edit] Poorly worded introduction?
Am I the only one who noticed that the introduction is worded funny?
"In general, a piston is a lubricated sliding shaft that fits tightly inside the opening of a cylinder. Its purpose is to change the volume enclosed by the cylinder, to exert a force on a fluid inside the cylinder, to cover and uncover ports, or some combination of these. A rubber seal is sometimes used to keep the lubricate within the shaft. Due to the constant motion of the machine this seal wears quickly and should be replaced with every servicing. If the seal should break during usage there can be disastrous long lasting consequences for the machine."
If it is, is there a way to reword this? SniperWolf1564 10:57, 16 May 2007 (UTC)
I realize that this introduction was deliberately worded this way, however, I think it's informative while also humourous and should be left the way it is. -Sparky 00:32, 18 May 2007 (UTC)
- I agree that the introduction was awful and I have re-written it. Biscuittin (talk) 11:09, 30 March 2008 (UTC)
Rewording is fine but redefining? This could have legal implications by patents for instance. In this version outside of "reciprocating engines, pumps and gas compressors" there are no pistons. What do you call an object that is driven through a long tube for instance by an expanding gas and possibly connected at its ends through a valve box to itself?
AdrianAbel (talk) 11:49, 29 April 2008 (UTC)
[edit] Angular Moving Piston
Hello. Does anybody heard about a new kind of piston, connected to a shaft? Such piston have angular motion (rather than linear motion) and produces less friction to the chamber walls.
A while ago I saw a documentary (in Discovery Channel or BBC, doesn't fully remember) that shows a Japanese engine that uses such piston. I think it would enrich this article.
If anybody know piston specifications mail to me at : karthirevi@rediffmail.com
[edit] Piston seizure
Is there no article on piston seizures in the English language WP (cause and effect)? In the German language WP, there is de:Kolbenfresser. --Abe Lincoln 15:07, 11 October 2006 (UTC)
[edit] timing
hello, could anyone tell me the length of time that a piston is still for between directions (from down back up ) and also is there a name for this. Thanks
- Whilst the crank is turning the piston only stops instantaneously at the top and bottom of it's stroke. These are known as 'top dead centre' and 'bottom dead center' respectively.
The exact amount of time spent at top and bottom dead centre depends on the speed of rotation of the connecting crankshaft and the amount of play at the big and small ends. As long as the crankshaft is running at a continuous speed and any play in the big and small end is negligible why should the piston connected to it spend any more time at angle zero as at any other angel of its rotation?
AdrianAbel (talk) 12:05, 29 April 2008 (UTC)
More specifically, if the crankshaft is turning at 360 RPM which is slower than most internal combustion engines run at idle speed (usually between 400 and 800 RPM) it needs one second to traverse one degree.
AdrianAbel (talk) 10:50, 2 May 2008 (UTC)
[edit] Governing equations
I am attempting to model the flow in and out of a single piston cylinder arrangement. On the down stroke the pressure in the cylinder decreases and a one way valve opens to admit fluid into the cylinder, on the up stroke the other one way valve opens (and the first closes) as the piston “pushes” fluid out of the cylinder. I will firstly begin modeling assuming the fluid in the cylinder is incompressible but later as the model becomes more complex I will model using compressible theory gas theory. If any one has any information or knows where I can get any information on the basic formulations of the energy, continuity and momentum equations could you please email me at: 14107864@sun.ac.za Thank you Paul
[edit] Piston and plunger
I am engineer and I can not beleive what is happening here. I can not find a word about materials for piston, and than I tried plunger, and I discovered engineering article there. Wow--Billy the lid (talk) 08:55, 27 December 2007 (UTC)
