NGK CR-8 EIX CR8EIX Spark Plug - white/silver

Product Information

Each and every spark plug manufactured by NGK is designed to meet the most rigorous standards, ensuring there ability to deliver reliability and consistent performance under all conditions. Each plug plays a major role in helping improve performance, fuel economy and the overall optimum efficiency helping to make a significant contribution in the reduction of emissions. Torque the spark plug up to your manufacturer’s recommended settings. If you don’t have a torque wrench, then get the plug hand tight and then add a ½ turn for a plug with a gasket, and more like a ¼ turn for a tapered spark plug. Over-tightening can snap the spark plug – a nightmare. Iridium’s extremely high melting point is perfectly suited to today’s high-temperature engines, delivering outstanding acceleration, fuel efficiency and durability. The firing end ceramic insulator shape is what mainly determines the heat range of the spark plug. The heat range is the most important factor to consider when replacing your plugs. Just don't install a heat range hotter than what is recommended - you will risk pre-ignition. So what is the heat range of a spark plug. Is it related to the temp the spark plug can endure or the length of the spark or what?

If someone has "high motor temperatures" then they have more to worry about than the firing end design (or material) of their spark plugs. A spark plug firing end temperature must be kept low enough to prevent pre-ignition, but high enough to prevent fouling. This is called “Thermal Performance”, and is determined by the heat range. The improved throttle response, superior anti-fouling and high ignitability are what makes Iridium IX ideal for the performance enthusiast. A regular spark plug uses a copper central electrode whereas an iridium spark plug uses, you guessed it, iridium.Trivalent Metal Plating – superior anti-corrosion and anti-seizing properties – no anti-seize lubricant needed! The firing end ceramic insulator shape is what mainly determines the heat range of the spark plug. The heat range is the most important factor to consider when replacing your plugs. Just don't install a heat range hotter than what is recommended - you will risk pre-ignition. The image of the spark plugs above shows four common conditions that you’ll find your spark plugs in. From left to right the plugs are Normal, Rich, Lean and Very Lean. Full descriptions below. A typical copper spark plug will last around 20,000 miles and most get changed at a major service (usually around 16,000 miles) but an iridium spark plug will be good for around 50,000 miles and you do see people running them to 100,000 miles with no issues.

The metal in a spark plug has a single purpose: to channel the electrical energy through the spark plug. Iridium is far harder than copper and this allows the spark plug manufacturers to create a plug with a sharper ‘tip’ which better focuses the spark around the centre electrode without compromising its service life.This change of mind return policy is in addition to, and does not affect your rights under the Australian Consumer Law including any rights you may have in respect of faulty items. To return faulty items see our Returning Faulty Items policy. I run NGK iridium plugs. I get them cheap because I am a Test Engineer for NGK (not bragging - just throwing that out there to lend credibility to my words.)

NGK is the brand leader in the UK spark plug market and are the world's biggest supplier to many major car manufacturers. Each and every one of their products are designed to meet the most rigorous standards and are the professionals' choice because of their quality and technical excellence. Their plugs can be found in use by teams in F1, WRC and MotoGP. Put simply, NGK genuine spark plugs are the workhorse at the heart of smooth-running engines around the world. The NGK Iridium IX Spark Plugs utilise a 0.6mm laser welded fine iridium tip which ensures high durability and a consistently stable spark along with a tapered ground electrode which minimizes electrical quenching effect. The longer insulator nose prevents fouling, the corrugated ribs on the insulator prevent flashover and a triple gasket seal eliminates combustion gas leakage. Designed specifically for the performance enthusiast Iridium IX offers extreme ignitability, improved throttle response and superior anti fouling. You’ll need this to help you find the location of your spark plugs and how to access them. This may sound simple but often the manual offers up some time-saving tips for your particular model. If you’ve not changed your plugs before, give yourself a couple of hours to complete the task. Here are the essentials you need for smooth re-plugging:Copper is generally seen as being the best metal to use in terms of conductivity but iridium plugs are seen as premium as they last longer than standard plugs and can be built with smaller tolerances. Iridium spark plugs also have lower voltage requirements, meaning they perform better when starting and idling and some manufacturers also claim they offer a better throttle response. If the engine is running dangerously lean the whole plug tip will be grey or white. If the temperature is over 850-degrees, pre-ignition may occur. Engine power will be reduced and you risk piston damage. Install each spark plug by hand until you have wound the thread a couple of turns. This reduces the chances of you cross-threading the plug.

The metal electrode shape or material really has nothing to do with the heat range - but the precious metal, fine electrode design will last longer. Err kind of agree, as I was told, there are two parts to the electrode, one which is made from steel. Steel conducts electricity and is magnetic but is it gets too red hot it becomes austenitic, doesn’t like to conduct electricity and becomes nonmagnetic so becomes more an insulator. This is safety for your engine because it will promote a miss and cool the motor down. I think your mechanic may be confusing two different possible issues. "Damage" and durability are two different things.

If the plug is brown or light grey your can assume your engine is in good condition and the spark plug is functioning well. Even when a plug is in good condition small deposits will accumulate. This is normal. Rich Iridium alloy has an extremely high melting point, perfect for today’s high-tech, high-performance engines