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 Petrol Engine shopping experience:
1. Compare - without doubt the biggest advantage that the Petrol Engine offers shoppers today is the ability to compare thousands of Petrol 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 Petrol Engine? Wrong! If the Petrol 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 Petrol Engine then search the Forums, FAQ's, Blogs etc. Don't be afraid to ask .....
5. Reputation - Never heard of the company selling Petrol 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 Petrol 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 Petrol 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 Petrol 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 Petrol Engine site before you buy, and the s after http:/ /i.e. https:// = a secure site
9. Contact - got a question about Petrol 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 Petrol 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:
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:
Design
Working cycles
Petrol engines may run on the four-stroke cycle or the two-stroke cycle. For details of working cycles see:
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
The most commonly used source of power for motor vehicles, introduced by the German engineers Gottlieb Daimler and Karl Benz in 1885
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.
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gasoline engine: see internal-combustion engine internal-combustion engine, one in which combustion of the fuel takes place in a confined space, producing expanding gases that are ...
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petrol engine - definition of petrol engine by the Free Online ...
Noun: 1. petrol engine - an internal-combustion engine that burns gasoline; most automobiles are driven by gasoline engines
