NGK Spark Plugs

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Help & Frequently Asked Questions

 

Spark Plug Questions

- How do I know which spark/glow plugs are right for my car?
- My vehicle is not in your vehicle search, what do I do?
- What is the function of a spark plug?
- Why are NGK spark plugs superior?
- What is the heat rating of a spark plug?
- What do NGK part numbers signify?
- What is the best way to select the correct spark plug?
- Why is the firing end appearence of a spark plug important?
- What is the function of the corrugations on the insulator?
- What is a resistor spark plug?
- What is a V-grooved type spark plug?
- What is the Iridium IX spark plug?
- What is a racing spark plug?
- What kinds of spark plug offer good resistance to carbon build up?
- What is spark plug fouling?
- what are the effects of spark plug overheating?
- what is good ignitability?
- Is a stain between the insulator and the metal shell caused by gas leakege?
- Is there a specified tightning torque for a spark?
- Appart from correct heat rating, what other precautions should be taken during installation of spark plugs?
- How long will a spark plug last?
- What are NGK Iridium Spark Plugs and why are they better than the standard spark plugs?
- What sparkplugs do I need for a Mazda RX7/RX8 (Rotary Engine)?
- Do the NGK Iridium spark plugs effect the performance of my car?
- What is the ideal spark plug gap?
- My vehicle is a LPG Car, will this have an effect on my choice of plugs?
- Why spark plugs with multiple-ground electrodes?
- My engine has been modified since manufacture, what do I do?

 

Order Questions

- How do I place an order?
- How do I know if my order has been received?
- Can I add to an existing order?
- What methods of payment do you accept?
- Are my card details secure?
- What do I do if my card is refused online?
- I have a discount code, how do I use it?

 

Delivery Questions

- My order has not arrived, what do I do?
- Can I get my goods delivered to a different address?

 

Item Returns

- I have received the incorrect spark/glow plugs, what do I do?

 

Policies & Procedures

- Privacy Policy
- Returns Policy
- What if I change my mind?
- What if there is a problem with the product?
- Safe Online Shopping

 

 
 
 
 
 

 

 

 

 
 
 
 
 

 

Spark/Glow Plug Questions

 

 

 

How do I know which spark/glow plugs are right for my car?

To know for sure which spark/glow plugs are right for your vehicle use our comprehensive search facility which will allow you to discover 100% the correct parts for your vehicle

 

 

 


My vehicle is not in your vehicle search, what do I do?

We have listed all of the major makes and models of car however to keep our lists as simple as possible we have ommited several rare and unique models, however we can still source the correct spark/glow plugs for you. Simple call 01670 706 985 between 9AM and 5PM Monday to Friday or email sales@1stautobulbs.comand leave us an email with your cars Make Model and Variant and any other information which will aid us in our search.

 

 

 


What is the function of a spark plug?

The spark created in the gap at the tip of the spark plug ignites the fuel/air mixture in the combustion chamber of the engine and drives a piston to create energy to drive your vehicle.

 

 

 


Why are NGK spark plugs superior?

NGK have been Pioneers of Spark Plug design Since 1958 and now they are Undisputed Leaders in Spark Plug Technology

NGK is a leader in automotive, truck & recreation vehicle spark plugs, with spark plugs for virtually every application in the world. Utilizing a wide variety of materials, from standard copper-core type to Iridium, NGK is the world's leader in spark plug engineering and technology. All NGK Spark Plugs are fully OEM Approved.

 

 

 

 

Why are NGK spark plugs superior?

NGK spark plugs are superior for several reasons:

1. Reduction in Heating and Fouling.

It has a centre electrode with copper deeply inserted in the tip to quickly dissipate large amounts of heat. This makes a spark plug with an "ultra wide heat range" that resists both heating and fouling.

NGK Spark Plugs cover a wider range of temperatures than that of standard plugs.

 

When the thermal characteristics of spark plugs with and without copper cores are compared, spark plugs with copper cores prove to be superior in heat and fouling resistance and provide a wider thermal operating range.

 

2. Incorporates an insulator made of state-of-the art high-alumina ceramics.

  • NGK spark plugs have superior insulation at high temperatures and offer sure sparking.
  • NGK spark plugs provide superior thermal conductivity and prevent overheating.
  • NGK spark plugs resist thermal shock (sudden heating and cooling and provides superior mechanical strength.)

3. Solid construction to ensure superb gas-tightness.

Special powders to connect the insulator and the metal shell offer superior gas-tightness and strong construction.

4. The electrode tip made of special nickel alloy ensures superior durability.

Special nickel alloy ensures superior heat resistance and durability.

 

Setting New Standards in Performance, Reliability and Technical Innovation

 

 

 

 

 

 


What is the heat rating of a spark plug?

A spark plug must dissipate the heat produced by the combustion gasses. The heat rating is a measure of the amount of head disipation. This heat rating is expressed as a number:

Hot Type:

Cold Type::

 

 

 


What do NGK part numbers signify?

The NGK spark plug numbers are the basis for selecting the spark plug specified by the manufacturer, see below for a breakdown:


 

 

 

What is the best way to select the correct spark plug?

The best way to select the correct spark/glow plug for your vehicle is to use our comprehensive Vehicle Search Application.


 

 

Why is the firing end appearence of a spark plug important?

It is important because the firing end appearance reflects the suitability of the spark plug as well as the condition of the engine.

There are three basic standards for evaluating a spark plug:


 

What is the function of the corrugations on the insulator?

The Corrugations on the insulator are there to prevent flash-over. Flash-over is when there is a spark between the terminal and the metal shell (See Below):

 

 

What is a resistor spark plug?

A Resistor spark plug incorporates a ceramic resistor of 5k ohms to suppress ignition noise generated during sparking. Resistor plugs prevent electrical interference that can disrupt car radio reception, two-way radio and cellular phone operation. This type of spark plug also prevents electrical noise from interfering with the operation of the computer in the engine.

Note:

As the resistor spark plug has an incorporated resistor, some people think that it has adverse effects on start-up, acceleration, fuel economy and emissions. However, this is wrong. It does not affect engine performance so do not hesitate to use it.

 

 


What is a V-grooved type spark plug?

The V-groove plug has a 90degree V shaped groove in the tip of the centre electrode to enhance ignitability. The v-groove ensures that the spark is directed to the periphery of the electrodes and so the flame core is generated near the perimeter of the electrodes and grows. Ignitability is improved because the electrodes are interfering less with the growth of the flame core.

 

 


What is the Iridium IX spark plug?

A new material called iridium is used at the tip of the centre electrode. This allows the electrode to be thinner than the previous platinum type, improving ignitability. In addition, the thermo edge designed in the iridium IX spark plug makes it highly resistant to carbon fouling.

 

 


What is a racing spark plug?

A racing spark plug is a high-performance spark plug for high-power engines with incresased compression ratio and higher rpm. This type of spark plug is used under harsh conditions such as continuous full-throttle acceleration, ultra high rpm and high speed operations. Racing spark plugs must support rapid acceleraton whilst surviving the most extreme operating conditions.

 

 

 


What kinds of spark plug offer good resistance to carbon build up?

A spark plug designed for the spark to jump along the insulator surface, and in doing so, may burn off accumulated carbon deposits which may lead to fouling.

 

 

 


What is spark plug fouling?

Spark plug fouling is a phenomenon by which carbon accumulated at the firing end causes electrical leakage that leads to mis-firing. As the voltage generated by the ignition coil leaks away through the carbon, mis-firing may occur and cause running and staring difficulties.

As carbon builds up, the insulation resistance of the spark plug drops and the voltage generated by the ignition coil is reduced. When the generated voltage becomes lower than the required voltage of the spark plug (the voltage needed to cause sparks at the spark gap), sparking is suppressed and mis-firing occurs.

 

 

 


what are the effects of spark plug overheating?

Prolonged overheating may induce abnormal combustion (pre-ignition) resulting in melting of the spark plug electrodes. When there is overheating, the insulator surface of the igniter becomes pure white and the burning gases deposit spots. Electrode melting is a more advanced type of overheating and when spark plug temperatures reach 800DegreesC or more (abnormal excessive heat), the tip of the plug may glow red hot and become a source of ignition prior to sparking, causing abnormal combustion (pre-ignition) that can damage the engine.


 

What is good ignitability?

Ignition performance refers to an engines ability to successfully and effectively, burn a wide range of air/fuel mixtures. A good spark plug can improve ignition performance.


 

Is a stain between the insulator and the metal shell caused by gas leakege?

It is not a stain caused by gas leakage but by corona discharge (corona stain). When a spark is removed, a brownish stain that looks like a sign of combustion gas flow is often seen at the caulked portion of the metal shell.

The stain is the result of oil particles suspended in air adhering to the surface of the insulator due to the high voltage. It does not affect spark plug performance.


 

Is there a specified tightning torque for a spark?

The tightning torque for a spark plug changes with the diameter of the spark plug. The following are the recommended torque values. When installing the spark plug, first screw it in by hand. Once the gasket has made contact with the cylinder head, use the torque wrench to tighten it to the tightening torque shown below.

Plug Thread Diameter

Tightening Torque
18mm
35 to 40N-m (3.5 to 4.0 kgm)
14mm
25 to 30N-m (2.5 to 3.0 kgm)
12mm
15 to 20N-m (1.5 to 2.0 kgm)
10mm
10 to 12N-m (1.0 to 1.2kgm)
8mm
8 to 10N-m (0.8 to 1.0 kgm)

 

 


Appart from correct heat rating, what other precautions should be taken during installation of spark plugs?

Ensure the spark plug has the correct thread reach.

The engine will not operate without the proper thread reach. If a spark plug with the wrong thread length is erroneously used, the piston or valve could strike it and damage the engine. Moreover, there is also the concern that the electrode could overheat and melt.

Ensure the spark plug has the correct projection dimensions.

There are several types of spark plug igniter shapes. Sometimes even when the length of the thread is correct, installing a spark plug with long metal shell projection dimensions may cause it to be struck by the piston or valve and result in engine trouble. Only use projection type plugs as specified by the manufacturer.


How long will a spark plug last?

Even when a spark plug is correctly used, periodic replacement is required as it is a consumable item. Examples of problems caused by excessively long periods of use:

 


What are NGK Iridium Spark Plugs and why are they better than the standard spark plugs?

Relatively recent advances in fabrication techniques have enabled the use of Iridium - an incredibly hard precious metal, for the construction of spark plug electrodes. Laser technology is used to weld the Iridium tip to spark plugs manufactured by both Denso and NGK. It's worth noting that spark plugs can't increase the potential power that an engine can generate but a more efficient spark will provide more efficient combustion and associated performance and economy benefits. A poor spark from a worn or low grade spark plug will reduce efficiency. An Iridium plug will produce a more efficient spark.


Notable properties of Iridium are its melting point - approximately 2450 degrees C, considerably higher than Platinum, and it's strength - approximately 8 times that of platinum. The table below compares the characteristics of Iridium with those of other precious/semi-precious metals commonly used in the construction of spark plugs.

Due to the properties of Iridium, the spark plugs centre electrode can be made with a much smaller diameter than with platinum, Gold or gold palladium and copper/nickel types without sacrificing service life. The spark plugs potential difference is more concentrated at the tiny Iridium tip and hence less 'spark jump' voltage is required - this can be as much as 5,000 volts less than with standard plug types. Ignition is improved and less strain is placed on the ignition system. Benefits of improved ignition/combustion include better fuel economy, increased power/acceleration and especially better throttle response.

NGK's Iridium IX product range of spark plugs in the UK is aimed predominantly at the motorcycle market. There are a few instances of cars officially imported into the UK that use Iridium IX spark plugs as standard equipment - evidence that automotive manufacturers have tried and tested and now trust the product.

 

 


What sparkplugs do I need for a Mazda RX7/RX8 (Rotary Engine)?

Both of these cars use Rotary Engines and because of this act a little differently. Most of these car models use a standard plug configuration which you can find by vehicle application search. One particular model to watch out for however is the twin turbo model as this uses both BUR9EQP and BUR7EQP plugs (2 of each). Because two different spark plugs are used it is very important that they are installed the correct way around.

 

 

 


Do the NGK Iridium spark plugs effect the performance of my car?

Because of the properties of Iridium, the spark plugs centre electrode can be made with a much smaller diameter than with platinum types (0.8mm), Gold or gold palladium and copper/nickel types. This means that spark plugs potential difference is more concentrated and hence less 'spark jump' voltage is required - this can be as much as 5,000 volts less than with standard plug types. Ignition is improved and less strain is placed on the ignition system. Benefits of improved ignition/combustion include better fuel economy, increased power/acceleration and especially better throttle response.

 

 


What is the ideal spark plug gap?

Information on individual cars will be found in your cars manual, however these plugs will be set to original factory settings and therefore should not need to be adjusted.

 

 

 


My vehicle is a LPG Car, will this have an effect on my choice of plugs?

Normally the answer is no. What you may have to do though is change your spark plugs more regularly because they will not last as long as when they are used with a standard petrol engine and the ignition system may have a harder time generating a spark.

 

 


 


My engine has been modified since manufacture, what do I do?

The best thing to do is consult your engine modifier, they will be able to advise you on the correct heat range and direct you to the correct spark plugs based on this information.

 

 

 

 

 

 

 

 

Order Questions

How do I place an order?

Once you have chosen the type of spark/glow plugBlade for your car several brand options will be displayed. Next to each of these options an 'Add to Cart' button will be displayed, simply click on the corresponding button for the item you wish to purchase (all spark/glow plugblade are priced and supplied singularly). We have spark/glow plugblades from major manufacturers such as Bosch and Classic.

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How do I know if my order has been received?

Once you have submitted your delivery details then all the information (including order number) will be displayed for you to confirm. After these details have been confirmed you will be taken to the 128bit SSL secure server to input your debit/credit card details. Once you have done this an 'order confirmation' screen is displayed thanking you for your order.

Note: Please keep your order number safe in case you need to contact us for any reason.

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Can I add to an existing order?

Once an order has been processed you cannot add additional items to it, however with free delivery it's well worth ordering from us again, even on the same day!

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What methods of payment do you accept?

Visa, Mastercard and Switch are all accepted.

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Are my card details secure?

1stAutoStore uses Realex payments and Allied Irish Bank to provide you, the customer, with a safe and secure internet shopping experience.

We have teamed up with Realex to provide unsurpassed security for you. They provide comprehensive payment solutions for: The AA, AXA, BT, DHL and Vodafone as well as many others. So you can be certain your financial and personal information is secure.

You can be assured that your details are safe when using the secure payment section, there will be a yellow padlock in your browser window (bottom right) this confirms a safe connection.

 

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What do I do if my card is refused online?

If your credit or debit card was refused while placing an order on 1stAutoStore.com, please re-submit your order using a different card. For details on why your card was refused, please contact your card issuer.

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I am part of a buying group and have a discount code, how do I use it?

There is a field for your discount code at the bottom of the delivery detail screen. You will be shown how much money has been saved on the confirmation screen.

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Delivery Questions


My order has not arrived, what do I do?

Deliveries sometimes are delayed because of local post issues, realistically you should be waiting no more than 1-5 working days, if you are in the UK, 2-7 days anywhere else. If you have waited longer than this please contact us immediately to resolve the issue.

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Can I get my goods delivered to a different address?

We at 1stAutoStore realise that sometimes you cannot be in when packages are delivered, we give you an option to deliver to an alternate address. However to authorise the card we also need your home address.

On the delivery details screen enter your name and home address, then (if required) enter the delivery address in the relevant fields.

Any queries contact us

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Item Returns


I have received the incorrect spark/glow plugs, what should I do?

While all efforts are made to ensure you get their correct spark/glow plugs, from time to time mistakes may happen. In this situation please email customer services (sales@1stautobulbs.com), give details including your Name, Order Number, details of the spark/glow plugs you received and the actual spark/glow plugs you require. We will then determine the correct spark/glow plugs for you and exchange them, if the fault was ours we will also pay for return carriage of the spark/glow plugs.

If you ordered incorrect spark/glow plugs we will be more than happy to send out the correct spark/glow plugs once we receive the old ones back, packaged in the original box, with your order number inside.

Please note, all goods returned to us must be in the same condition as they were sent (i.e. original box) and a copy of the order number enclosed as proof of purchase.

Returns can be made to:

1stAutoStore
Randstad House
Crowhall Road
Nelson Park
Cramlington
Northumberland
NE23 1WH

 

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Policies & Procedures


Privacy Policy

At 1stAutoStore we believe in protecting our customer’s privacy. Information we collect about you from the orders you place will be stored securely, in-line with the Data Protection Act of 1998.

We may use this information ourselves from time to time to inform you of special offers, which we feel, may be of benefit to you. Please note however that this information will NEVER be passed on to any other company, we only only ever use it ourselves to provide an excellent level of service.

We will only contact you via email and you can remove yourself from this list by either not ticking the personal information box on the delivery details screen, or by contacting us and asking to be taken off the mailing list.

We at 1stAutoStore care about our customers, and will only ever use information if we feel it is of benefit to you.

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Returns Policy

We at 1stAutoStore want you to be completely happy with everything you buy from ourselves, so we're always here to help.

Please make sure that you check your items carefully before they are used or installed. We also recommend that you keep your receipt and order number, which can be found on your order confirmation, or on the delivery packaging. You might need it as proof of purchase in the event of any after-sales queries.

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What if I change my mind?

If you ordered the goods less than 16 days ago that's fine. All our products are covered by our no-quibble 16-day money-back guarantee. Return them to us in the post unused, in their original packaging with the invoice, and we'll give you a refund. This does not affect your statutory rights.

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What if there is a problem with the product?

Please return the faulty product(s) within 60 days,complete with your invoice and we'll send out a replacement. This does not affect your statutory rights.

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Safe Online Shopping

1stAutoStore uses Realex payments and Allied Irish Bank to provide you, the customer, with a safe and secure internet shopping experience.

We have teamed up with Realex to provide unsurpassed security. Realex provide comprehensive payment solutions for: The AA, AXA, BT, DHL and Vodafone as well as many others. So you can be certain your financial and personal information is secure.

When entering your credit card, the browser will automatically redirected you to the Realex payment site and will display the padlock image on the bottom right of your screen. Whenever the padlock is shown, you are working in what is known as a 'secure' mode, at this point anything you send to Realex will be encrypted using high strength encryption. Your credit card details go directly to the bank for processing. We at 1stAutoStore don't see your credit card details. Shopping on 1stAutoStore.com is even more secure than using your credit card in the high street.

BE WARY of ANYWHERE on the internet that does not offer the Yellow Padlock and requests submission of personal information!

Security is of paramount importance to 1stAutoStore, because of this we have chosen Realex as our partner. Realax Payments operate security policies and controls that exceed industry standards.

 

 

 

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