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 Gasoline Engine shopping experience:

1. Compare - without doubt the biggest advantage that the Gasoline Engine offers shoppers today is the ability to compare thousands of Gasoline Engine 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 Gasoline Engine? Wrong! If the Gasoline Engine 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 Gasoline Engine then search the Forums, FAQ's, Blogs etc. Don't be afraid to ask .....

5. Reputation - Never heard of the company selling Gasoline Engine? 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 Gasoline Engine 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 Gasoline Engine 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 Gasoline Engine 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 Gasoline Engine site before you buy, and the s after http:/ /i.e. https:// = a secure site

9. Contact - got a question about Gasoline Engine, 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 Gasoline Engine, 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.

A Petrol engine or Gasoline engine is an internal combustion engine with spark-ignition designed to run on petrol (gasoline) and similar volatile fuels. It differs from a diesel engine in the method of mixing the fuel and air, and in the fact that it uses spark plug. In a diesel engine, merely the air is compressed, and the fuel is injected at the end of the compression stroke. In a petrol engine, the fuel and air are pre-mixed before compression. The pre-mixing was formerly done in a carburettor but now (except in the smallest engines) it is done by electronically-controlled fuel injection. Pre-mixing of fuel and air allows a petrol engine to run at a much higher speed than a diesel, but severely limits their compression, and thus efficiency .

Applications Petrol engines have many applications, including:

• Automobile
• Motorcycles
• Aircraft
• Motorboats
• Small machines, such as lawn mowers, chainsaws and Electrical generator

Design Working cycles Petrol engines may run on the four-stroke cycle or the two-stroke cycle. For details of working cycles see:

• Four-stroke cycle
• Two-stroke cycle
• Wankel engine

Cylinder arrangement Common cylinder arrangements are from 1 to 6 cylinders Straight engine or from 2 to 16 cylinders in V engine. Alternatives include Rotary engine and Radial engine the latter typically have 7 or 9 cylinders in a single ring, or 10 or 14 cylinders in two rings.

Cooling Petrol engines may be Air-cooled engine, by fins on the cylinders, or liquid-cooled, by a water jacket and radiator. The Antifreeze was formerly water but is now usually a mixture of water and ethylene glycol. This mixture has a lower freezing-point and a higher boiling-point than pure water. In addition, the cooling system is usually slightly pressurized to minimise evaporation of coolant.

Compression ratio The compression ratio is the ratio between the cylinder volumes at the beginning and end of the compression stroke. Broadly speaking, the higher the compression ratio, the higher the efficiency of the engine. However, compression ratio has to be limited to avoid pre-ignition of the fuel-air mixture which would cause engine knocking and damage to the engine. Modern motor-car engine generally have compression ratios of between 9:1 and 10:1, but this can go up to 11 or 12:1 for high-performance engines that run on, say, 98 R0N (93 AKI, US Premium- or European Super-grade) petrol. In the 1950s, with Octane rating and less well-designed cylinder heads, compression ratios were between 6.5:1 and 7:1. Old tractor engines running on tractor vaporising oil might have compression ratios as low as 4.5:1 but modern tractors have diesel engines.

Ignition main article Ignition system Petrol engines use spark ignition and high voltage current for the spark may be provided by a Magneto (electrical) or an ignition coil. In modern car engines the ignition timing is managed by an electronic Engine Control Unit.

Future Concerns about global warming and air pollution have put a question mark over the future of the petrol engine. Much has been done to improve its fuel efficiency and reduce emissions and this has bought it more time. In the long run it will probably be replaced by the electric motor in some applications but this is not likely to happen soon.

Sources

• Linked Wikipedia articles

A Petrol engine or Gasoline engine is an internal combustion engine with spark-ignition designed to run on petrol (gasoline) and similar volatile fuels. It differs from a diesel engine in the method of mixing the fuel and air, and in the fact that it uses spark plug. In a diesel engine, merely the air is compressed, and the fuel is injected at the end of the compression stroke. In a petrol engine, the fuel and air are pre-mixed before compression. The pre-mixing was formerly done in a carburettor but now (except in the smallest engines) it is done by electronically-controlled fuel injection. Pre-mixing of fuel and air allows a petrol engine to run at a much higher speed than a diesel, but severely limits their compression, and thus efficiency .

Applications Petrol engines have many applications, including:

• Automobile
• Motorcycles
• Aircraft
• Motorboats
• Small machines, such as lawn mowers, chainsaws and Electrical generator

Design Working cycles Petrol engines may run on the four-stroke cycle or the two-stroke cycle. For details of working cycles see:

• Four-stroke cycle
• Two-stroke cycle
• Wankel engine

Cylinder arrangement Common cylinder arrangements are from 1 to 6 cylinders Straight engine or from 2 to 16 cylinders in V engine. Alternatives include Rotary engine and Radial engine the latter typically have 7 or 9 cylinders in a single ring, or 10 or 14 cylinders in two rings.

Cooling Petrol engines may be Air-cooled engine, by fins on the cylinders, or liquid-cooled, by a water jacket and radiator. The Antifreeze was formerly water but is now usually a mixture of water and ethylene glycol. This mixture has a lower freezing-point and a higher boiling-point than pure water. In addition, the cooling system is usually slightly pressurized to minimise evaporation of coolant.

Compression ratio The compression ratio is the ratio between the cylinder volumes at the beginning and end of the compression stroke. Broadly speaking, the higher the compression ratio, the higher the efficiency of the engine. However, compression ratio has to be limited to avoid pre-ignition of the fuel-air mixture which would cause engine knocking and damage to the engine. Modern motor-car engine generally have compression ratios of between 9:1 and 10:1, but this can go up to 11 or 12:1 for high-performance engines that run on, say, 98 R0N (93 AKI, US Premium- or European Super-grade) petrol. In the 1950s, with Octane rating and less well-designed cylinder heads, compression ratios were between 6.5:1 and 7:1. Old tractor engines running on tractor vaporising oil might have compression ratios as low as 4.5:1 but modern tractors have diesel engines.

Ignition main article Ignition system Petrol engines use spark ignition and high voltage current for the spark may be provided by a Magneto (electrical) or an ignition coil. In modern car engines the ignition timing is managed by an electronic Engine Control Unit.

Future Concerns about global warming and air pollution have put a question mark over the future of the petrol engine. Much has been done to improve its fuel efficiency and reduce emissions and this has bought it more time. In the long run it will probably be replaced by the electric motor in some applications but this is not likely to happen soon.

Sources

• Linked Wikipedia articles

Petrol engine - Wikipedia, the free encyclopedia
A Petrol engine or Gasoline engine is an internal combustion engine with spark-ignition designed to run on petrol (gasoline) and similar volatile fuels.

Internal combustion engine - Wikipedia, the free encyclopedia
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