NGK BM4Y Spark Plug

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Rating

3.1 / 5 Overall
NGK	BM4Y
Brand	Code
3.0 / 5 Materials
Copper	Copper
Ground electrode	Center electrode
3.3 / 5 Design
Standard	V-Cut
Ground type	Center type

Specifications

0.7mm (.028")	4
Gap	Heat range
⌀14mm	1.25mm
Thread diameter	Thread pitch
9.5mm (3/8")	19mm (3/4")
Reach	Hex size
Gasket	Removable Nut
Seat	Terminal
1	Non-Projected
Ground count	Projection

Cross-reference and alternatives

Cross-reference (2)

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

XST258

Iridium-Platinum

4.2/ 5

.024"9.5mm, ⌀14x1.25HR 9

258

Copper

2.9/ 5

.024"9.5mm, ⌀14x1.25HR 9

Deep reference (17)

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

W14M-U

Copper

3.3/ 5

.028"9.5mm, ⌀14x1.25HR 14

W14M-U

Copper

3.3/ 5

.028"9.5mm, ⌀14x1.25HR 14

5846

Copper

3.2/ 5

.024"9.5mm, ⌀14x1.25HR 14

5846

Copper

3.2/ 5

.024"9.5mm, ⌀14x1.25HR 14

CJ14

Copper

2.9/ 5

.030"9.5mm, ⌀14x1.25HR 14

RJ12C

Copper

2.9/ 5

.030"9.5mm, ⌀14x1.25HR 12

BM4A

Copper

2.9/ 5

.028"9.5mm, ⌀14x1.25HR 4

BMR2A

Copper

2.9/ 5

.028"9.5mm, ⌀14x1.25HR 2

BMR2A-10

Copper

2.9/ 5

.039"9.5mm, ⌀14x1.25HR 2

BMR4A

Copper

2.9/ 5

.028"9.5mm, ⌀14x1.25HR 4

CJ14

Copper

2.9/ 5

.030"9.5mm, ⌀14x1.25HR 14

RJ12C

Copper

2.9/ 5

.030"9.5mm, ⌀14x1.25HR 12

BM4A

Copper

2.9/ 5

.028"9.5mm, ⌀14x1.25HR 4

BMR2A

Copper

2.9/ 5

.028"9.5mm, ⌀14x1.25HR 2

BMR2A-10

Copper

2.9/ 5

.039"9.5mm, ⌀14x1.25HR 2

BMR4A

Copper

2.9/ 5

.028"9.5mm, ⌀14x1.25HR 4

B4-LM

Copper

2.9/ 5

.028"9.5mm, ⌀14x1.25HR 4

Same specs (2)

Products that have identical characteristics that impact interchangability

BM4A SOLID

Copper

2.9/ 5

.028"9.5mm, ⌀14x1.25HR 4

BM4A

Copper

2.9/ 5

.028"9.5mm, ⌀14x1.25HR 4

Two steps colder (2)

Two steps colder spark plugs with same characteristics for heavily modified engines (150-200 hp increase)

BM6A

Copper

2.9/ 5

.028"9.5mm, ⌀14x1.25HR 6

BM6A SOLID

Copper

2.9/ 5

.028"9.5mm, ⌀14x1.25HR 6