Never had any say Panda I <3 Floods Silver Donating Members 11,198 Member For: 13y 6m 14d Gender: Male Location: South West QLD Posted 21/08/12 11:50 PM Share Posted 21/08/12 11:50 PM Haha.. Helpful like a 3rd nipple..Who would've thought to use google.. Link to comment Share on other sites More sharing options...
senna_T Forged Member Lifetime Members 15,818 Member For: 18y 8d Gender: Male Location: SW Sydney Posted 21/08/12 11:50 PM Share Posted 21/08/12 11:50 PM Link to comment Share on other sites More sharing options...
tab Sucker Moderating Team 32,303 Member For: 20y 9m 21d Gender: Male Location: Brisbane Posted 21/08/12 11:55 PM Share Posted 21/08/12 11:55 PM Fck me you're a needy bitch. A piston is a component of reciprocating engines, reciprocating pumps, gas compressors and pneumatic cylinders, among other similar mechanisms. It is the moving component that is contained by a cylinder and is made gas-tight by piston rings. In an engine, its purpose is to transfer force from expanding gas in the cylinder to the crankshaft via a piston rod and/or connecting rod. In a pump, the function is reversed and force is transferred from the crankshaft to the piston for the purpose of compressing or ejecting the fluid in the cylinder. In some engines, the piston also acts as a valve by covering and uncovering ports in the cylinder wall.The piston of an internal combustion engine is acted upon by the pressure of the expanding combustion gases in the combustion chamber space at the top of the cylinder. This force then acts downwards through the connecting rod and onto the crankshaft. The connecting rod is attached to the piston by a swivelling gudgeon pin (US: wrist pin). This pin is mounted within the piston: unlike the steam engine, there is no piston rod or crosshead.The pin itself is of hardened steel and is fixed in the piston, but free to move in the connecting rod. A few designs use a 'fully floating' design that is loose in both components. All pins must be prevented from moving sideways and the ends of the pin digging into the cylinder wall, usually by circlips.Gas sealing is achieved by the use of piston rings. These are a number of narrow iron rings, fitted loosely into grooves in the piston, just below the crown. The rings are split at a point in the rim, allowing them to press against the cylinder with a light spring pressure. Two types of ring are used: the upper rings have solid faces and provide gas sealing; lower rings have narrow edges and a U-shaped profile, to act as oil scrapers. There are many proprietary and detail design features associated with piston rings.Pistons are cast from aluminium alloys. For better strength and fatigue life, some racing pistons may be forged instead. Early pistons were of cast iron, but there were obvious benefits for engine balancing if a lighter alloy could be used. To produce pistons that could survive engine combustion temperatures, it was necessary to develop new alloys such as Y alloy and Hiduminium, specifically for use as pistons.A few early gas engines[note 1] had double-acting cylinders, but otherwise effectively all internal combustion engine pistons are single-acting. During World War II, the US submarine Pompano[note 2] was fitted with a prototype of the infamously unreliable H.O.R. double-acting two-stroke diesel engine. Although compact, for use in a cramped submarine, this design of engine was not repeated. Cheers Link to comment Share on other sites More sharing options...
senna_T Forged Member Lifetime Members 15,818 Member For: 18y 8d Gender: Male Location: SW Sydney Posted 21/08/12 11:58 PM Share Posted 21/08/12 11:58 PM All that was required....Gas sealing is achieved by the use of piston rings. These are a number of narrow iron rings, fitted loosely into grooves in the piston, just below the crown. The rings are split at a point in the rim, allowing them to press against the cylinder with a light spring pressure. Two types of ring are used: the upper rings have solid faces and provide gas sealing; lower rings have narrow edges and a U-shaped profile, to act as oil scrapers. There are many proprietary and detail design features associated with piston rings. Link to comment Share on other sites More sharing options...
Never had any say Panda I <3 Floods Silver Donating Members 11,198 Member For: 13y 6m 14d Gender: Male Location: South West QLD Posted 22/08/12 12:01 AM Share Posted 22/08/12 12:01 AM Alright then.. So since I already know what a piston ring is and what it does..What's the best material to make it out of and why?Wikipedia says iron.. Helpful like a third nipple..Steel is an iron alloy.. Is it grey cast? Is it ductile? Link to comment Share on other sites More sharing options...
tab Sucker Moderating Team 32,303 Member For: 20y 9m 21d Gender: Male Location: Brisbane Posted 22/08/12 12:02 AM Share Posted 22/08/12 12:02 AM Steam engines are usually double-acting (I.e. steam pressure acts alternately on each side of the piston) and the admission and release of steam is controlled by slide valves, piston valves or poppet valves. Consequently, steam engine pistons are nearly always comparatively thin discs: their diameter is several times their thickness. (One exception is the trunk engine piston, shaped more like those in a modern internal-combustion engine.) Cheers. Link to comment Share on other sites More sharing options...
tab Sucker Moderating Team 32,303 Member For: 20y 9m 21d Gender: Male Location: Brisbane Posted 22/08/12 12:04 AM Share Posted 22/08/12 12:04 AM (edited) Ntsama Atangana was born sometime between 1876 and 1885 in Mvolyé, a small village in what is today Yaoundé, Cameroon.........Cheers. Edited 22/08/12 12:08 AM by senna_T Link to comment Share on other sites More sharing options...
Never had any say Panda I <3 Floods Silver Donating Members 11,198 Member For: 13y 6m 14d Gender: Male Location: South West QLD Posted 22/08/12 12:04 AM Share Posted 22/08/12 12:04 AM f*ck off tab :-pYour posts annoy me.. Then I read 'cheers' and I burst out laughing.. 1 Link to comment Share on other sites More sharing options...
Ralph Wiggum Moar Powar Babeh Lifetime Members 19,323 Member For: 19y 4m 23d Gender: Male Location: Perth Posted 22/08/12 12:05 AM Share Posted 22/08/12 12:05 AM Thanks Wikimpellor Link to comment Share on other sites More sharing options...
tab Sucker Moderating Team 32,303 Member For: 20y 9m 21d Gender: Male Location: Brisbane Posted 22/08/12 12:06 AM Share Posted 22/08/12 12:06 AM Cheers. Link to comment Share on other sites More sharing options...
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