OEM manufactures select appropriate spark plugs for the engine and vehicle type, so use the specified spark plugs.
I: High- performance spark plugs
X: Shape [type, IRIDIUM POWER]
W: Thread diameter and hex size
R: Internal Construction
16: Heat range
U: Shape [type]
E: Reach
11: Gap
High Performance Plug | IW16EXR-U11 | |
---|---|---|
Code | Center Electrode | Ground Electrode |
F | 0.55 Iridium (needle to needle Iridium spark plugs) | 0.7 needle platinum |
I | 0.4 Iridium (Iridium Power) | U-groove |
P | 1.1 Platinum (platinum spark plugs) | With platinum tips |
S | 0.7 Iridium (iridium spark plugs) | With platinum tips |
SV | 0.4 Iridium (iridium spark plugs) | With platinum tips |
V | 0.7 Iridium (Iridium Tough) | With platinum tips |
Z | 0.55 Iridium (iridium spark plugs) | With platinum tips |
Thread Diameter & Hex Size | IW16EXR-U11 | ||||||
---|---|---|---|---|---|---|---|
Code | Thread Diameter | Hex Size | Application | Code | Thread Diameter | Hex Size | Application |
M | 18mm | 25mm | Thread length 12mm | Q* | 14mm | 16mm | Compact plugs |
L | 18mm | 22mm | Thread length 12mm | QJ* | 14mm | 16mm | Small, projection spark plugs |
MW | 18mm | 21mm | Thread length 12mm | QL* | 14mm | 16mm | Small, long-torso housing plugs |
MA | 18mm | 21mm | Taper sheet, thread length 12mm | S | 14mm | 21mm | Surface Discharge spark plugs (for RE engines) |
WF | 14mm | 21mm | Iridium Power (Ø 0.4), reach 12.7mm | SF** | 14mm | 21mm | Surface discharge spark plugs |
UF | 10mm | 16mm | Iridium Power (Ø 0.4), reach 12.7mm | T | 14mm | 16mm | Taper seat |
UH | 10mm | 16mm | Iridium Power (Ø 0.4), half threads | TR** | 14mm | 21mm | Only for marine |
TF | 14mm | 16mm | Iridium Power (Ø 0.4), Tapered sheet, reach 11.2mm | W** | 14mm | 21mm | |
J* | 14mm | 21mm | Projection spark plugs | N/A | 19mm | Compact types | |
K*+ | 14mm | 16mm | Small spark plugs | X* | 12mm | 18mm | |
KJ*+ | 14mm | 16mm | Small, projection spark plugs | XU* | 12mm | 16mm | |
LP | 14mm | 21mm | LPG spark plugs | U* | 10mm | 16mm | |
P* | 14mm | 21mm | Platinum spark plugs | U | 10mm | 14mm | U20M-U only |
Y* | 8mm | 13mm | |||||
Z | 1/2PF | 24mm |
*Reach 19, +ISO type, **Reach 12.7
Heat Range | IW161EXR-U11 | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Denso | 9 | 14 | 16 | 20 | 22 | 24 | 27 | 29 | 31 | 32 | 34 |
NGK | 2 | 4 | 5 | 6 | 7 | 8 | 9 | 9.5 | 10 | 10.5 | 11 |
Champion | 18 | 16 | 12, 11 | 10, 9 | 8, 7 | 63, 61 | 59 | 57 | 55 | 53 | |
Bosch | 10 | 9 | 8 | 7, 6 | 5 | 4 | 3 | 2 |
« Hot Type | Cold Type »
Reach | IW16EXR-U11 | |
---|---|---|
Code | Thread Diameter | Model Examples |
A | 19mm Electrode position 7mm 21.5mm | J16AR-U11 |
B | 19mm Electrode position 9.5mm | KJ20CR11 |
C | 19mm Electrode position 5mm | K20DTR-S11 |
D | 19mm shroud 2 | W16EXR-U |
E (with gasket) | 19mm 20mm | W25EBR |
E (taper seat) | 18mm | T16EPR-U |
F | 13mm | W20FP-U |
FE | 19mm half threads | U24FER9 |
G | 19mm shroud 3 19mm shroud 3 | X27GPR-U PK20GR8 |
H | 19mm Electrode position 9mm 27mm | QJ16HR-U K16HPR-U11 |
L | 11mm | W14L |
M | 9mm | U20M-U |
N (taper seat) | 18mm | T20NR-U11 |
V (taper seat) | 25mm | PT16VR13 |
None | 10mm 11mm 19mm 19mm 22mm | W14M-U L14-U P16R PK20PR11 S27 |
None (taper seat) | 8mm 11mm 11mm | T20M-U T16PR-U MA16PR-U |
Shape (Type) | IW16EXR-U11 | |
---|---|---|
Code | Thread Diameter | Model Examples |
A | Double ground electrodes | W22EA |
A | Slanted ground electrode (for racing) | K29A-Z |
AY | Double ground electrodes and special curved shape | J16AY |
B | Triple ground electrodes | W22EB |
D | Four ground electrodes | W27EDR |
K | Insulator projection 1mm | W16EK-S11 |
LM | Compact type (20.6mm hex) | W14LM-U |
M | Type with shorter insulator head length | W27EMR-C |
M | Compact type (19mm hex) | W20M-U |
N | Racing type (nickel electrodes) | W27EN |
Pt | Racing type (platinum electrodes) | W31EPT |
P | Projection (projection 1.5mm) | W16EP-U |
S | No projection (projection 0mm) | W24ES-U |
T | Double ground electrodes | W20ET-S |
TM | Double ground electrodes | K22TM |
TN | Double ground electrodes | K22TNR-S |
V | Slanted ground electrode | QL22VR-ZU |
X | Full projection (projection 2.5mm) | W16EX-U |
-C | Ground cutback | W27EMR-C |
-GL | Platinum center electrode | X22EPR-GL |
-L | Retracted insulator only for CVCC Retracted insulator for motorcycles Fine center electrode type for motorcycles Heat-proof ground electrode type | W20ESR-L11 W14FP-UL W20FR-L U20FS-L K20PR-L |
-M | Ground electrode size increased | |
-N | Spark plugs for Yamaha and Kawasaki | U24ESR-N |
-P | Uses two layers of platinum for the ground electrode Uses platinum for the center or ground electrode | PQ20R-P8 |
-S | Semi-surface discharge type | Q20PR-P |
-SA | Half high heat range type with semi-surface discharge | W20EPR-S |
-TP | Platinum center electrode and ground electrode taper cut | K20PR-TP |
-U | U-groove electrode | W16EX-U |
-US | Uses star-shaped center electrode | W14-US |
-V | Ultra-fine center electrode | W27ES-V |
-Z | 0.7mm diameter platinum alloy center electrode | K29A-Z |
-ZU | 0.7mm diameter platinum alloy center electrode and u groove Ground electrode with taper cut | W27ES-ZU |
Shape (Iridium Power) | IU27A |
---|---|
Code | Thread Diameter |
A | Slant electrode, no u-groove, no taper cut |
B | Projected insulator (1.5mm) |
C | No u-groove |
D | No u-groove, inconel ground electrode |
ES | Stainless steel gasket |
F | Special |
G | Stainless steel gasket |
J | Projected insulator (2.5mm) |
K | Special |
L | Projected insulator (2.5mm) |
T | For lpg applications, strengthened insulator |
X | .8mm gap |
Y | .8mm gap |
Z | Taper cut |
Internal Construction | IW16EXR-U11 |
---|---|
Code | Shape |
R | With register |
None | No register |
GAP | IW16EXR-U11 |
---|---|
Code | Shape |
8 | 0.8mm (0.032") |
9 | 0.9mm (0.035") |
10 | 1.0mm (0.040") |
11 | 1.1mm (0.044") |
13 | 1.3mm (0.050") |
14 | 1.4mm (0.055") |
15 | 1.5mm (0.060") |
20 | 2.0mm (0.080") |