4 New NGK Iridium IX Spark Plugs CR9EIX # 3521 by NGK

Product Information

A regular spark plug uses a copper central electrode whereas an iridium spark plug uses, you guessed it, iridium. Iridium alloy has extremely high melting point, perfect for today’s high-tech, high-performance engines

NGK Iridium Motorbike Spark Plug CR9EIX9 | Halfords UK

Iridium IX Spark Plugs are the most technologically advanced high performance plugs available. Featuring a 0.6 mm iridium center electrode tip, they offer superior ignitability without sacrificing durability. The tapered ground electrode increases flame kernel expansion, while the superior heat range design is ideally suited to the demands of high performance environments. Still not convinced these are fake plugs? One of the best parts of this whole investigation is that we of course found out the fake plugs don’t feature any IRIDIUM tipped centre electrode at all, it’s all LIES.

Spark plugs are often called "hot" or cool or anything inbetween... This has NOTHING to do with how hot the fuel burns. It has to do with how hot the spark plug gets. This is why you can't 1. hurt your engine with the wrong plugs... you can only hurt your plugs. and 2. Plug slection has no affect on engine performance or horse power... If your plug is fireing during every power stroke... that's the best it can do. Fatter spark, bigger spark, super jiggy spark Doesn't matter... if the fuel/air mix is being ignited every time... that's as good as it gets. Mind you, there are 1000 things that can mess with "fireing every power stroke" but you won't get more power using a "hotter" plug. Guaranteed next working day delivery available for mainland UK. Please allow an extra day for Scottish Highlands. The fakes terminal caps were finger tight, whereas the genuine caps couldn’t be undone by hand and needed pliers. Anyway, I got them for not a lot more than the standard ones so I am happy enough with them. :cheers

FOR V-TWIN ENGINES - NGK Spark Plugs FOR V-TWIN ENGINES - NGK Spark Plugs

M10 (10 mm) threaded plugs with a gasket show just 10-12nm of torque are needed for aluminium heads. Now compare this to an M14 plug, where we see over double the amount: 25-30nm. Torquing down an M10 plug to 30nm will most definitely cause either distortion to the plug and eventually snap into bits, or the cylinder head thread will strip; not good. so the uber smart engineers calculate that heat transfer path, the average temp for the engine at full throttle and full load, and at idle... proposed engine coolent temp limits and toss in 20% safety margin and then design a plug that will hold self cleaning temps over the widest range of engine RPM, ambient temp, etc. with out ever reaching "burn out" temp and volia' you have a plug for your specific engine. All three are .4 mm iridium center electrode, 10 mm thread diameter, 19 mm reach, 16 mm hex, .9 mm gap, and 5 kΩ resistor.Fakes are also known to not feature any copper core which means they retain heat and can eventually meltdown, it’s likely to be the same with these fakes. 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.