For me NGK PFR7G-11 are the ones. Denso iridium are ok but I think you must regulate the gap for 1,1mm.
Denso Iridium racing are the best imo... Thinner center electrode (.04mm) and a carved side electrode to make a bigger, cleaner spark.
BTW DOOOOOOO NOOOOOT REGAP IRIDIUM SPARK PLUG!!!!!!!!!!! THEY ARE GAPPED FOR YOUR ENGINE (if u buy the good ones)... The gapping you see in the CTR's owners manual isnt for iridium. Iridium is a different metal and its electricity conductivity is higher... Regapping them will srew your explosion timing
There's something I don't understand, original gap is 1.1 recomend by Honda BUT if you buy a box of spark plugs by spoon sports (is the iridium power ik24 by denso) they have this text in the box:
Please set the spark plug gap (0.8mm) as standart.
If you instead of denso you buy the NGK cross reference witch is iriway8 the plug gap come at 1.1mm.
So in MY opinion if you want to buy a set of iridium plugs you should buy NGK because it comes with the gap recomended by Honda.
i didnt say engine timing, i said explosion timing
Electrical conductivity of Copper: 595.8 1/mohm-cm
Electrical conductivity of Iridium: 188.679 1/mohm-cm
Its NORMAL that the gap has to be different... none of these 2 materials conduct the same way... one of them is much slower than the other... its physics
put it this way. you're on a 1/4 mile, the finish line is like when the piston is up, and its the fraction of second that is the best time to explode. you, you're the iridium electrode,you go at 50kph, while you opponant, is the copper electrode, he goes at 100 kph. You tell me both of you will cross the line at the same time ? im sorry but its crap...
its OBVIOUS that the gap needs to be different, thats why they are gapped in manifacture, WITH the proper gap. Maybe in 2008-2009 cars the tell the gap for iridium plug in the owner's manual... but not in ek9's
Anyone got a proper part number for the iridium NGK plugs for b16b?
what you may be referring to is the RATE OF IGNITION.
btw if our engines are running with exploding mixtures we would have melted or holed pistons in the first few minutes of operation, detonation is the sudden explosion of combustible mixture inside the combustion chamber. for an engine to operate efficiently you need a controlled ignition of the combustible material, not an explosion.
Anyone got a proper part number for the iridium NGK plugs for b16b?