Champion RJ6C Spark Plug

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Rating
Brand	Code
2.9 / 5 Overall
Champion	RJ6C
3.0 / 5 Materials
Copper	Copper
Ground electrode	Center electrode
2.8 / 5 Design
Standard	Standard
Ground type	Center type

Specifications
Gap	Heat range
0.75mm (.030")	6
⌀14mm	1.25mm
Thread diameter	Thread pitch
9.5mm (3/8")	21mm (13/16")
Reach	Hex size
Gasket	Removable Nut
Seat	Terminal
1	Non-Projected
Ground count	Projection

Cross-reference and alternatives

How we find alternative spark plugs How we rate spark plugs

Cross-reference (2)

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

303

Copper

2.9/ 5

.035"9.5mm, ⌀14x1.25HR 4

BR6S

Copper

2.9/ 5

.028"9.5mm, ⌀14x1.25HR 6

Deep reference (11)

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

W16S-U

Copper

3.3/ 5

.028"9.5mm, ⌀14x1.25HR 16

W20S-U

Copper

3.3/ 5

.028"9.5mm, ⌀14x1.25HR 20

W20PR-U

Copper

3.3/ 5

.028"9.5mm, ⌀14x1.25HR 20

J6C

Copper

2.9/ 5

.030"9.5mm, ⌀14x1.25HR 6

B7S

Copper

2.9/ 5

.028"9.5mm, ⌀14x1.25HR 7

BR6S

Copper

2.9/ 5

.028"9.5mm, ⌀14x1.25HR 6

303

Copper

2.9/ 5

.035"9.5mm, ⌀14x1.25HR 4

WR9EC0

Copper

2.9/ 5

.031"9.5mm, ⌀14x1.25HR 9

592-1

Copper

2.9/ 5

.030"9.5mm, ⌀14x1.25HR 12

592C

Copper

2.9/ 5

.030"9.5mm, ⌀14x1.25HR 12

RJ12C

Copper

2.9/ 5

.030"9.5mm, ⌀14x1.25HR 12

Same specs (2)

Products that have identical characteristics that impact interchangability

823-1

Copper

2.9/ 5

.030"9.5mm, ⌀14x1.25HR 6

J6C

Copper

2.9/ 5

.030"9.5mm, ⌀14x1.25HR 6

One step colder (2)

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

J4C

Copper

2.9/ 5

.030"9.5mm, ⌀14x1.25HR 4

825C

Copper

2.9/ 5

.030"9.5mm, ⌀14x1.25HR 4