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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.) 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.
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. 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? 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. If you’re going to be doing any sort of work on the bike, treat yourself to a decent set of tools. Most of mine are from the Halfords Advanced range (formerly called Professional).Iridium alloy has an extremely high melting point, perfect for today’s high-tech, high-performance engines If someone has "high motor temperatures" then they have more to worry about than the firing end design (or material) of their spark plugs. OK I think your mechanic may be confusing two different possible issues. "Damage" and durability are two different things. I don’t agree, the main reason for plugs to have a heat range is to keep um clean. When a plug runs at the “correct temperature” is far less prone to fouling, go to hot it can result in pre-ignition but if your plugs are fouling up, going up one on the heat range is advisable, misfiring is not good for engines. 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
A regular spark plug uses a copper central electrode whereas an iridium spark plug uses, you guessed it, iridium. 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:
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As I understand it, pre-ignition is just that, normally caused by a hot spot in the combustion chamber, bit of shit or too hot a plug that glows red and ignites the fuel/air mixture before spark.
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. 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. 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.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. 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. Iridium’s extremely high melting point is perfectly suited to today’s high-temperature engines, delivering outstanding acceleration, fuel efficiency and durability. 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. 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.
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. Allows the use of an extremely small diameter electrode (0.6mm) without compromising the spark plug’s service life 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. This nifty little tool only costs a few quid and will help you set the correct gap for your spark plug. However, modern plugs are almost all motorcycle-specific fit and so they come ‘pre-gapped’ and you won’t need to touch them. If you’re running a classic bike, you’ll probably need to set your gap and if your bike’s not running right, a gap tool can help you rule out a potential incorrect gap issue.
Iridium Spark Plug vs Standard
Most engine designs will respond favorably to a plug with better ignitability. If you don't notice a difference using your five senses - then probably only a gas analyzer will show the improvement. If that is the case, and you don't care how long it is between your plug replacement intervals, then don't bother spending the extra money. 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. 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.
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