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 Glow Plug shopping experience:

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

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

9. Contact - got a question about Glow Plug, 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 Glow Plug, 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.

For the similar device used in model aircraft engines, see Glow plug (model engine).

A glowplug (alternately spelled as glow plug or glow-plug) is a heating device used to aid starting diesel engine.

Purpose diesel engine, unlike petrol engine, do not use spark plug to induce combustion. Instead, they rely solely on compression. The piston rises, compressing the air in the Cylinder (engine); this, by natural effect, causes the air's temperature to rise. By the time the cylinder reaches the top of its travel path, the amount of heat in the cylinder is very high. The fuel mist is then sprayed into the cylinder; it instantly combusts, forcing the cylinder downwards, thus generating power. The amount of pressure required to heat the air to that temperature, however, necessitates the use of a large and very strong engine block. The problem posed is that in cold weather, if the engine has not been running (as is the case when the car is left to sit overnight), that large engine block becomes very cold; when one then attempts to start the engine, the cold engine block acts as a heat sink, quickly dissipating the heat generated by the pistons compressing air. The engine is then unable to start, because it can not generate and maintain enough heat for the fuel to combustion.

One common, and very effective, method for fixing this problem is to fit each Cylinder (engine) with a glowplug. For that reason, many smaller diesel engines come pre-fitted from the factory with glow-plugs.

Method of operation In a diesel-engine car, unlike in a gasoline-engine car, the operator does not simply turn the key to the "start" position and have the engine immediately start. Instead, the operator turns the key to the "on" position; the glowplug relay switches the glowplugs on, and a light (see picture at right) on the instrument cluster illuminates. This process is called "pre-heating" or "glowing".

If the car has been running very recently, or if the ambient temperature is hot, the "wait to start" light may not come on; in this case, the operator may proceed turn the key to the "start" position and start the engine without having to wait.

A glowplug is a pencil-shaped piece of metal with a heating element at the tip; that heating element, when electrified, electrical resistance (very similar to the element in a toaster). The heat generated by the glowplugs is directed into the cylinders, and serves to warm the part of the engine block immediately surrounding the cylinders. This aids in reducing the amount of heat transfer which will occur when the engine attempts to start.

When internal sensors detect that the core of the engine block has reached a certain designated temperature, or when a certain amount of time elapses, the glowplug relay switches off the "wait-to-start" light. The pre-heating process usually lasts for 10 to 20 seconds (less if the engine is warm). The operator then turns the key to the "start" position, and holds it there until the engine starts. The glowplug relay switches off the glowplugs after the engine is running (or, in older cars, at the same time the "wait to start" light goes out) (or, in some newer cars, up to 180 seconds after starting to keep the engine within emissions regulations efficiency is greatly reduced when the engine is very cold).

Construction A glowplug resembles a short metal pencil. The heating filament is fitted into its tip. Glowplug filaments must be made of materials, such as platinum or iridium, which are resistant to both oxidation and high levels of heat.

Problems In some cars, including all older cars, it is possible to attempt to start the engine (crank it over) while the glowplugs are switched on (relays in many modern cars prevent this). The heat caused by the engine's combustion, when combined with the heat from being electrified, is destructive to the glowplugs; the overheating can easily cause them to burn out. Thus, it is important to wait for the the "wait to start" light to go out before cranking the engine.

Glowplugs have a limited lifespan. Certain factors, such as the aforementioned overheating, can greatly shorten that lifespan. The amount of heat which a glowplug produces diminishes over time; this causes the engine to become progressively harder to start in cold weather.

Glowplugs are inexpensive, and typically easy to replace -- making it worthwhile to replace them annually in areas with a cold winter season.

Modern advancements Indirect-injection engines are less thermally efficient, due to the greater surface area of their cylinders, and so suffer more from cold-starting issues. They require longer pre-heating times than direct-injection engines, which often do not need glow plugs at all in temperate or hot climates even for a cold start. Most modern diesel cars use direct-injection engines (see Turbocharged Direct Injection).

Modern automotive diesel engines use various electronic methods of altering the timing and style of the injection process to ensure reliable cold-starting. Glow plugs are still fitted, but are rarely used for more than a few seconds.

Large engines Large diesel engines, such as those used in heavy construction equipment and locomotives, do not need glow plugs. Their cylinders are large enough that the air in the middle of the cylinder is not in contact with the cold walls of the cylinder, and thus retains enough heat to allow ignition.

See Also Block heater

External links

• http://www.lvspada.com.ar/eng/home.htm

For the similar device used in model aircraft engines, see Glow plug (model engine).

A glowplug (alternately spelled as glow plug or glow-plug) is a heating device used to aid starting diesel engine.

Purpose diesel engine, unlike petrol engine, do not use spark plug to induce combustion. Instead, they rely solely on compression. The piston rises, compressing the air in the Cylinder (engine); this, by natural effect, causes the air's temperature to rise. By the time the cylinder reaches the top of its travel path, the amount of heat in the cylinder is very high. The fuel mist is then sprayed into the cylinder; it instantly combusts, forcing the cylinder downwards, thus generating power. The amount of pressure required to heat the air to that temperature, however, necessitates the use of a large and very strong engine block. The problem posed is that in cold weather, if the engine has not been running (as is the case when the car is left to sit overnight), that large engine block becomes very cold; when one then attempts to start the engine, the cold engine block acts as a heat sink, quickly dissipating the heat generated by the pistons compressing air. The engine is then unable to start, because it can not generate and maintain enough heat for the fuel to combustion.

One common, and very effective, method for fixing this problem is to fit each Cylinder (engine) with a glowplug. For that reason, many smaller diesel engines come pre-fitted from the factory with glow-plugs.

Method of operation In a diesel-engine car, unlike in a gasoline-engine car, the operator does not simply turn the key to the "start" position and have the engine immediately start. Instead, the operator turns the key to the "on" position; the glowplug relay switches the glowplugs on, and a light (see picture at right) on the instrument cluster illuminates. This process is called "pre-heating" or "glowing".

If the car has been running very recently, or if the ambient temperature is hot, the "wait to start" light may not come on; in this case, the operator may proceed turn the key to the "start" position and start the engine without having to wait.

A glowplug is a pencil-shaped piece of metal with a heating element at the tip; that heating element, when electrified, electrical resistance (very similar to the element in a toaster). The heat generated by the glowplugs is directed into the cylinders, and serves to warm the part of the engine block immediately surrounding the cylinders. This aids in reducing the amount of heat transfer which will occur when the engine attempts to start.

When internal sensors detect that the core of the engine block has reached a certain designated temperature, or when a certain amount of time elapses, the glowplug relay switches off the "wait-to-start" light. The pre-heating process usually lasts for 10 to 20 seconds (less if the engine is warm). The operator then turns the key to the "start" position, and holds it there until the engine starts. The glowplug relay switches off the glowplugs after the engine is running (or, in older cars, at the same time the "wait to start" light goes out) (or, in some newer cars, up to 180 seconds after starting to keep the engine within emissions regulations efficiency is greatly reduced when the engine is very cold).

Construction A glowplug resembles a short metal pencil. The heating filament is fitted into its tip. Glowplug filaments must be made of materials, such as platinum or iridium, which are resistant to both oxidation and high levels of heat.

Problems In some cars, including all older cars, it is possible to attempt to start the engine (crank it over) while the glowplugs are switched on (relays in many modern cars prevent this). The heat caused by the engine's combustion, when combined with the heat from being electrified, is destructive to the glowplugs; the overheating can easily cause them to burn out. Thus, it is important to wait for the the "wait to start" light to go out before cranking the engine.

Glowplugs have a limited lifespan. Certain factors, such as the aforementioned overheating, can greatly shorten that lifespan. The amount of heat which a glowplug produces diminishes over time; this causes the engine to become progressively harder to start in cold weather.

Glowplugs are inexpensive, and typically easy to replace -- making it worthwhile to replace them annually in areas with a cold winter season.

Modern advancements Indirect-injection engines are less thermally efficient, due to the greater surface area of their cylinders, and so suffer more from cold-starting issues. They require longer pre-heating times than direct-injection engines, which often do not need glow plugs at all in temperate or hot climates even for a cold start. Most modern diesel cars use direct-injection engines (see Turbocharged Direct Injection).

Modern automotive diesel engines use various electronic methods of altering the timing and style of the injection process to ensure reliable cold-starting. Glow plugs are still fitted, but are rarely used for more than a few seconds.

Large engines Large diesel engines, such as those used in heavy construction equipment and locomotives, do not need glow plugs. Their cylinders are large enough that the air in the middle of the cylinder is not in contact with the cold walls of the cylinder, and thus retains enough heat to allow ignition.

See Also Block heater

External links

• http://www.lvspada.com.ar/eng/home.htm

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For the similar device used in model aircraft engines, see Glow plug (model engine).

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