NGK TR7IX 3690 Spark Plug

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Rating

3.8 / 5 Overall
NGK	TR7IX
Brand	Code
4.0 / 5 Materials
Copper	Iridium
Ground electrode	Center electrode
3.5 / 5 Design
Standard	Fine Wire
Ground type	Center type

Specifications

1mm (.039")	7
Gap	Heat range
⌀14mm	1.25mm
Thread diameter	Thread pitch
18mm (.709")	16mm (5/8")
Reach	Hex size
Tapered	Solid
Seat	Terminal
1	Non-Projected
Ground count	Projection

Cross-reference and alternatives

Cross-reference (1)

Alternative spark plugs found in cross-reference docs provided by manufacturers

IT22

Copper-Iridium

4.3/ 5

.031"17.5mm, ⌀14x1.25HR 22

Deep reference (4)

A second level of cross-reference: if A=B and B=C, then A=C

XP103

Iridium-Platinum

4.2/ 5

.050"17.5mm, ⌀14x1.25HR 1

BR7EF

Copper

3.1/ 5

.028"18mm, ⌀14x1.25HR 7

BP7EFS

Copper

2.9/ 5

.031"18mm, ⌀14x1.25HR 7

BR7EFS

Copper

2.9/ 5

.028"18mm, ⌀14x1.25HR 7

One step colder (1)

Colder spark plugs with same characteristics for moderately tuned engines (75–100 hp increase)

TR8IX

Copper-Iridium

-

3.8/ 5

.039"18mm, ⌀14x1.25HR 8