Spark plug NARAKU 14-R9-LIR (BR9EIX), iridium

Naraku iridium spark plug.
Great advantage of an iridium spark plug is the very thin centre electrode. The ignition voltage is distributed over a small area only and thus produces a strong and concentrated spark, which leads to a clean combustion even under extreme conditions. In addition, coking of the electrode is reduced, which significantly increases its durability.
The durability of iridium spark plugs is many times higher compared to standard spark plugs. Fuel consumption is reduced and the combustion chamber remains free of combustion residues for longer.
OEM numbers for comparison purposes only:
NGK: BR9EIX
Beru: 14 Z-2 C1 / 310/14/3Z
Bosch: W 3 CS / WR 3 CS / 0 241 256 515 / 0 242 255 504
Champion: N 2 G / OE 125 / QN 2 G / RN 2 G
Denso: IW 27 / W 27 EPT / W 27 ESGU / W 27 ESRZU / 5317
Marelli: CWP 10 L
14 = B thread diameter 14mm
R = R (Resistor) resistor core 5kOhm
9 = 9 heat value
L = E (Long) long plug thread
IR = IX iridium