Key Features & Benefits – Denso Iridium spark plug IK24

Denso Iridium spark plug IK24 is for engines that match these key installation dimensions: M14x1.25 thread, 19 mm reach, 16 mm hex, and a 0.8 mm gap. It is recommended for Opel Calibra, Opel Astra GSi and Subaru Impreza WRX/WRX STi EJ20 applications when the replacement parameters match the OEM plug.

A core feature is the 0.4 mm iridium-alloy tip and a laser welding mounting process for precise assembly. Iridium has a melting point of 2446°C, and IK24 uses a single ground electrode design.

When is this useful?

If you want an iridium spark plug as an OEM-style replacement in the same size, matching thread, reach, hex size, and gap is the reliable starting point. For tuned use, heat range selection and the condition of the ignition system together determine whether the change suits the load.

Technical specs

• Brand: Denso
• Product type: Spark plug
• Electrode type: Iridium
• Center electrode diameter: 0.4 mm
• Thread: M14x1.25
• Thread reach: 19 mm
• Hex size: 16 mm
• Gap: 0.8 mm
• Ground electrodes: 1
• Recommended quantity: 4
• Iridium melting point: 2446°C

Selection & installation tips

• Compatibility: Recommended for:
  Opel Calibra C20XE, C20NE, X20XEV 2 liter tuned engine up to 400 lóerőig
  Opel Calibra Turbó C20LET 2 liter tuned engine up to 400lóerőig
  Opel Astra GSi C20XE 2 liter tuned engine up to 400 lóerő lóerőig
  Subaru Impreza Wrx and Wrx STi heavily tuned 2.0 liter EJ20 engines up to about 400 lóerőig
  
  Compatible models (also for OEM replacement):
  AUDI
  100 C4 Avant (4A5) – S4 Turbo quattro – AAN – 1991/09–1994/07 – 2,2L – 169 kW / 230 LE
  100 C4 Saloon (4A2) – S4 Turbo quattro – AAN – 1991/08–1994/07 – 2,2L – 169 kW / 230 LE
  200 C3 Avant / Saloon (447, 448) – 2.2 20V Turbo quattro – 3B – 1989/03–1990/12 – 2,2L – 162 kW / 220 LE
  80 B4 Avant (8C5) – S2 quattro – ABY – 1993/02–1995/07 – 2,2L – 169 kW / 230 LE
  80 B4 Avant (8C5) – RS2 quattro – ADU – 1994/03–1995/05 – 2,2L – 232 kW / 315 LE
  80 B4 Saloon (8C2) – S2 quattro – ABY – 1993/02–1994/12 – 2,2L – 169 kW / 230 LE
  Coupe B3 – S2 quattro – 3B / ABY – 1990/09–1996/12 – 2,2L – 162–169 kW / 220–230 LE
  A4 B7, B8, Allroad, Avant stb. – wide 2.0 TFSI compatibility (multiple engine codes: BGB, BWE, CDNC, stb.) – 2004–2016 – 1.8L and 2.0L turbo petrol engines
  A5, A6, A7, A8, Q3, Q5, Q7, R8, TT models – wide year and engine-code coverage for 1.8 TFSI, 2.0 TFSI, 3.0 TFSI
  FORD
  Escort V / VI – RS Cosworth 4x4 – N5F – 1991/10–1998/10 – 2,0L – 162 kW / 220 LE
  Sierra II Hatchback – RS Cosworth 4x4 – N5C – 1990/01–1993/02 – 2,0L – 162 kW / 220 LE
  HONDA
  CRF 450R – PE05 – 2002–2007 – 450 cm3 – 41–42 kW / 52–56 LE
  TRX 450R Sportrax – 2004–2006 – 450 cm3 – 15–37 kW / 20–50 LE
  JAGUAR
  XJ (X300, X330) – R Supercharged – 9KPDRB – 1994/11–1997/07 – 4,0L – 235 kW / 320 LE
  LAND ROVER
  Discovery IV (L319) – 3.0 4x4 – 306PS – 2013/08–2018/12 – 3,0L – 250 kW / 340 LE
  LOTUS
  Exige (SCC_) – 1.8 16V – 2ZZ-GE – 2000/05–2008/07 – 1,8L – 132–141 kW / 180–192 LE
  NISSAN
  Sunny III Hatchback (N14) – 2.0 GTI-R 4x4 – SR20DET – 1990/10–1995/05 – 2,0L – 162 kW / 220 LE
  PORSCHE
  911 (996) – GT3 – M96.79 – 2003/03–2005/09 – 3,6L – 280 kW / 381 LE
  Carrera GT (980) – M80.01 – 2003/07–2006/12 – 5,7L – 450 kW / 612 LE
  ROVER
  100 / METRO Hatchback (XP) – 114 GTI/GT 16V Cat – 14 K4D, 14 K4C – 1990/03–1998/12 – 1,4L – 66 kW / 90 LE
  SAAB
  9-5 (YS3E) – 3.0 V6t – B308E – 1998/01–2005/08 – 3,0L – 147 kW / 200 LE
  9-5 Estate (YS3E) – 3.0 V6t – B308E – 1998/10–2005/08 – 3,0L – 147 kW / 200 LE
  SEAT
  Alhambra, Altea, Exeo, Leon, Toledo – 1.8 TSI / 2.0 TFSI engines – engine codes: BZB, CDAA, CCZB, stb. – 2005–2015 – 1.8L / 2.0L
  SKODA
  Octavia II, Superb II, Yeti – 1.8 TSI, 2.0 TFSI engines – BZB, CDAA, CCZA, CDAB – 2005–2015 – 1.8L / 2.0L
  VOLVO
  850 / V70 – B5234T3 / T4 – 1995/08–2000/12 – 2,3L – 176–184 kW / 239–250 LE
  VW
  Beetle, CC, EOS, Golf V/VI, Jetta, Passat B6/B7, Scirocco, Sharan, Tiguan, Touareg, Transporter T6 – wide 1.8 TSI / 2.0 TFSI compatibility – 2004–2019 – engine codes: BWA, CAWB, CCZB, CCTA, CBFA, stb. – 1.8L / 2.0L / 3.0L
• Dimension match: confirm thread, reach, and hex size on your old plug, then compare to the specs above.
• Seat type: check whether your cylinder head uses a gasket seat or a tapered seat and match it exactly.
• Gap: measure the gap before installation and keep the OEM specified value.
• Tightening: follow the OEM tightening procedure and torque, especially with aluminum cylinder heads.

Before final fitment, verify your OEM plug’s thread, reach, hex size, seat type, and gap, then compare them to the specs and compatibility list above so every critical parameter matches your exact setup.