Shopping on line can be easy, simple and save you lots of money. It can also take a lot of your time, frustrate you, and result in unwanted purchases. Now the same can be said for regular high street shopping, but with the vast opportunity presented by the Internet it will pay you to spend a few minutes reading this and understanding how to better optimize your Piston shopping experience:
1. Compare - without doubt the biggest advantage that the Piston offers shoppers today is the ability to compare thousands of Piston at a time. This is a great thing, but not necessarily all the time! Too much can be daunting at times so take advantage of the great comparison sites and where possible let them do the hard work for you.
2. Research - if it has been said it will be on the internet. Ignorance is no longer a justifiable reason for buying the wrong thing. Take the time to research in detail everything that you could possible want to know about
3. Testimonials - don't know anybody that has bought a Piston? Wrong! If the Piston is good the internet will let you know. Use the Internet as a friend and get testimonials before you buy.
4. Questions - Got a question about Piston then search the Forums, FAQ's, Blogs etc. Don't be afraid to ask .....
5. Reputation - Never heard of the company selling Piston? Don't worry, no reason why you should know every company in the world, but you know someone that does! Use the internet to find out what people are saying about Piston and build up a picture of their reputation for sales, returns, customer service, delivery etc.
6. Returns - still worried that even after all of the above your Piston wont be what you want? Check out the returns policy. There is so much competition now that someone, somewhere is bound to offer the terms that you are comfortable with.
7. Feedback - happy with your Piston then let people know, after all you are depending on others people input in your buying decision, so why not give a little back.
8. Security - check for the yellow padlock on the Piston site before you buy, and the s after http:/ /i.e. https:// = a secure site
9. Contact - got a question about Piston, or want to leave a comment then check out the sites contact page. Reputable companies have them and respond.
10. Payment - ready to pay for your Piston, then use your credit card or PayPal! Be aware of companies that don't accept them, there may be genuine reasons but given the huge amount of choice you have when buying online there is no reason at all not to buy via credit card or PayPal.
, DOHC piston engine. (E) Exhaust
camshaft, (I) Intake camshaft, (S)
Spark plug, (V) poppet valves, (P) Piston, (R)
Connecting rod, (C) Crankshaft, (W) Water jacket for coolant flow.
In general, a
piston is a rigid, lubricated sliding
shaft that fits tightly inside the opening of a Cylinder (engine). 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 lubricant 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.
Creating force
There are two ways that a piston engine can transform combustion into motive power. These are two-stroke and four-stroke.
A single cylinder two-stroke engine produces power every crankshaft revolution, while a single cylinder four-stroke engine produces power once every two revolutions. Older designs of small two-stroke engines produced more pollution than four stroke engines. However, modern two-stroke designs, like the Vespa ET2 Injection utilise fuel-injection and are as clean as four-strokes. Large diesel two-stroke engines, as used in ships and locomotives, have always used fuel injection and produce low emissions. One of the biggest internal combustion engines in the world, the Wärtsilä-Sulzer RTA96-C is a two-stroke; it is bigger than most two-storey houses, has pistons nearly 1 metre in diameter and is one of the most efficient mobile engines in existence. In theory, a four stroke engine has to be larger than a two stroke engine to produce an equivalent amount of power. Two stroke engines are becoming less common in developed countries these days, mainly due to manufacturer reluctance to invest in reducing two-stroke emissions. Traditionally, two stroke engines were reputed to need more maintenance (despite exceptions like the
Harry Ricardo Dolphin engine, and the
Twingle engines of the
Trojan (automobile) and the Puch 250 motorcycle). Even though the simplest two stroke engines have fewer moving parts, they could wear out faster than four stroke engines. However fuel-injected two-strokes achieve better engine lubrication, and cooling and reliability should improve considerably. And then you have to move it move it
Pistons used in Air-Cannons:
There are two special type of pistons used in air cannons-close tolerance piston and double piston.While in close tolerance piston,o-rings are used as valve but in double piston,o-rings are not used.there are some features o close tolerance piston mentioned below:1.Piston can swell out stick2.Fits tightly in the cylinder3.Tight Tolerance fit4.Properties alter due to atmospheric change5.Backlash may such,some of the bin material into the valve which also can cause the piston to stick
Common features of Double piston:1.Cannot swell and stick2.Fits loosely in the cylinder3.No tight tolerance fit4.Due to atmospheric change,properties are not altered.5.Even if foreighn materials enters the valve,the double piston cannot stick.
Gallery
image:piston.jpg|A piston and its connecting rod.Image:Cad crank.jpg|CAD drawing of
crankshaft and pistons.Image:Piston Power Plant Stony Batter.jpg|Large pistons (over 0.5 m incl. connecting rod).Image:Piston.gif|Simplified piston animation.
See also
- Knurling
- Wankel engine (an internal combustion engine with a rotary 'piston')
References
External References
- Piston highlight: Hypervideo of construction and operation of four cylinder internal combustion engine courtesy of Ford Motor Company
, DOHC piston engine. (E) Exhaust camshaft, (I) Intake camshaft, (S) Spark plug, (V) poppet valves, (P) Piston, (R) Connecting rod, (C) Crankshaft, (W) Water jacket for coolant flow.
In general, a
piston is a rigid, lubricated sliding shaft that fits tightly inside the opening of a
Cylinder (engine). 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 lubricant 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.
Creating force
There are two ways that a piston engine can transform combustion into motive power. These are two-stroke and four-stroke.
A single cylinder two-stroke engine produces power every crankshaft revolution, while a single cylinder four-stroke engine produces power once every two revolutions. Older designs of small two-stroke engines produced more pollution than four stroke engines. However, modern two-stroke designs, like the
Vespa ET2 Injection utilise fuel-injection and are as clean as four-strokes. Large diesel two-stroke engines, as used in ships and locomotives, have always used fuel injection and produce low emissions. One of the biggest internal combustion engines in the world, the Wärtsilä-Sulzer RTA96-C is a two-stroke; it is bigger than most two-storey houses, has pistons nearly 1
metre in
diameter and is one of the most efficient mobile engines in existence. In theory, a four stroke engine has to be larger than a two stroke engine to produce an equivalent amount of power. Two stroke engines are becoming less common in developed countries these days, mainly due to manufacturer reluctance to invest in reducing two-stroke emissions. Traditionally, two stroke engines were reputed to need more maintenance (despite exceptions like the Harry Ricardo Dolphin engine, and the
Twingle engines of the
Trojan (automobile) and the Puch 250 motorcycle). Even though the simplest two stroke engines have fewer moving parts, they could wear out faster than four stroke engines. However fuel-injected two-strokes achieve better engine lubrication, and cooling and reliability should improve considerably. And then you have to move it move it
Pistons used in Air-Cannons:
There are two special type of pistons used in air cannons-close tolerance piston and double piston.While in close tolerance piston,o-rings are used as valve but in double piston,o-rings are not used.there are some features o close tolerance piston mentioned below:1.Piston can swell out stick2.Fits tightly in the cylinder3.Tight Tolerance fit4.Properties alter due to atmospheric change5.Backlash may such,some of the bin material into the valve which also can cause the piston to stick
Common features of Double piston:1.Cannot swell and stick2.Fits loosely in the cylinder3.No tight tolerance fit4.Due to atmospheric change,properties are not altered.5.Even if foreighn materials enters the valve,the double piston cannot stick.
Gallery
image:piston.jpg|A piston and its connecting rod.Image:Cad crank.jpg|CAD drawing of
crankshaft and pistons.Image:Piston Power Plant Stony Batter.jpg|Large pistons (over 0.5 m incl. connecting rod).Image:Piston.gif|Simplified piston animation.
See also
- Knurling
- Wankel engine (an internal combustion engine with a rotary 'piston')
References
External References
- Piston highlight: Hypervideo of construction and operation of four cylinder internal combustion engine courtesy of Ford Motor Company
Piston - Wikipedia, the free encyclopedia
A piston is a component of reciprocating engines, pumps and gas compressors. It is located in a cylinder and is made gas-tight by piston rings. In an engine, its purpose is to ...
Walter Piston - Wikipedia, the free encyclopedia
Walter Hamor Piston Jr. (January 20, 1894 – November 12, 1976) was an American composer and music theorist.
Walter Piston
Biography, key works, selected discography, links.
PistonHeads.com :: Speed Matters
Motoring Magazine,Cars for Sale,Forums ... TVRs Destroyed In Fire. Fire at TVR workshop leaves seven TVRs destroyed and others badly damaged
Gassing Station
Forum: Posts: Last Post ... 20:07: The Pie & Piston
www.pistonheads.net
Bradford Piston & Piston Ring Co. Ltd
Manufacturer of piston and sealing rings. Product specifications and contact details.
Claron Double Acting Piston Seals
Claron are manufacturers of Hydraulic Seals - Piston Seals, Rod or Gland Seals, Wiper Seals, Bearing Rings, O-Rings, Back-Up Rings, Seal Kits, PTFE Products, PTFE Components, Semi ...
Kerb - Animation - Piston Junkies
Piston Junkies is a animation/audio collaboration between Kerb and LongRange Producers of high quality flash animation for use in cartoons, video, mobile and web.
The Fire Piston
The Fire Piston. The fire piston was developed in Southeast Asia, Indonesia and the Philippines. A fire piston consists of a hollowed tube (originally this would have been made out ...
