Bosch W4AC Spark Plug

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Rating

2.9 / 5 Overall
Bosch	W4AC
Brand	Code
3.0 / 5 Materials
Copper	Copper
Ground electrode	Center electrode
2.8 / 5 Design
Standard	Standard
Ground type	Center type

Specifications

0.5mm (.020")	4
Gap	Heat range
⌀14mm	1.25mm
Thread diameter	Thread pitch
12.7mm (1/2")	21mm (13/16")
Reach	Hex size
Gasket	Removable Nut
Seat	Terminal
1	Non-Projected
Ground count	Projection

Cross-reference and alternatives

Cross-reference (5)

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

IWF24

Copper-Iridium

4.3/ 5

.031"12.7mm, ⌀14x1.25HR 24

XS4092

Iridium-Platinum

4.2/ 5

.031"12.7mm, ⌀14x1.25HR 2

W24FS-U

Copper

3.3/ 5

.028"12.7mm, ⌀14x1.25HR 24

4092

Copper

-

2.9/ 5

.031"12.7mm, ⌀14x1.25HR 2

B8HS

Copper

-

2.9/ 5

.024"12.7mm, ⌀14x1.25HR 8

Deep reference (80)

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

IWF27

Copper-Iridium

4.3/ 5

.031"12.7mm, ⌀14x1.25HR 27

IWF24

Copper-Iridium

4.3/ 5

.031"12.7mm, ⌀14x1.25HR 24

IWF24

Copper-Iridium

4.3/ 5

.031"12.7mm, ⌀14x1.25HR 24

XS4093

Iridium-Platinum

4.2/ 5

.031"12.7mm, ⌀14x1.25HR 4

XS4092

Iridium-Platinum

4.2/ 5

.031"12.7mm, ⌀14x1.25HR 2

XS4092

Iridium-Platinum

4.2/ 5

.031"12.7mm, ⌀14x1.25HR 2

BPR8HIX

Copper-Iridium

3.8/ 5

.031"12.7mm, ⌀14x1.25HR 8

BR8HIX

Copper-Iridium

3.8/ 5

.031"12.7mm, ⌀14x1.25HR 8

BR9HIX

Copper-Iridium

3.8/ 5

.031"12.7mm, ⌀14x1.25HR 9

BR8HIX

Copper-Iridium

3.8/ 5

.031"12.7mm, ⌀14x1.25HR 8

BR7HIX

Copper-Iridium

3.8/ 5

.031"12.7mm, ⌀14x1.25HR 7

BR9HIX

Copper-Iridium

3.8/ 5

.031"12.7mm, ⌀14x1.25HR 9

BR8HIX

Copper-Iridium

3.8/ 5

.031"12.7mm, ⌀14x1.25HR 8

W24FS-U

Copper

3.3/ 5

.028"12.7mm, ⌀14x1.25HR 24

W27FS-U10

Copper

3.3/ 5

.039"12.7mm, ⌀14x1.25HR 27

W24FS-U

Copper

3.3/ 5

.028"12.7mm, ⌀14x1.25HR 24

W27FS-U10

Copper

3.3/ 5

.039"12.7mm, ⌀14x1.25HR 27

W24FS-U

Copper

3.3/ 5

.028"12.7mm, ⌀14x1.25HR 24

R5525-8

Copper

3.2/ 5

.026"12.7mm, ⌀14x1.25HR 8

BU8H

Copper

3.2/ 5

.016"12.7mm, ⌀14x1.25HR 8

BUZ8H

Copper

3.2/ 5

.016"12.7mm, ⌀14x1.25HR 8

QL16V

Copper

3.2/ 5

.059"12.7mm, ⌀14x1.25HR 16

BU8H

Copper

3.2/ 5

.016"12.7mm, ⌀14x1.25HR 8

BUZ8H

Copper

3.2/ 5

.016"12.7mm, ⌀14x1.25HR 8

QL16V

Copper

3.2/ 5

.059"12.7mm, ⌀14x1.25HR 16

BR8HCS-10

Copper

3.1/ 5

.039"12.7mm, ⌀14x1.25HR 8

BR8HCS-10

Copper

3.1/ 5

.039"12.7mm, ⌀14x1.25HR 8

B8HS

Copper

-

2.9/ 5

.024"12.7mm, ⌀14x1.25HR 8

BP8HS

Copper

-

2.9/ 5

.028"12.7mm, ⌀14x1.25HR 8

BP8HS-10

Copper

-

2.9/ 5

.039"12.7mm, ⌀14x1.25HR 8

BP8HS-15

Copper

-

2.9/ 5

.059"12.7mm, ⌀14x1.25HR 8

BPR8HS

Copper

-

2.9/ 5

.028"12.7mm, ⌀14x1.25HR 8

BR8HS

Copper

-

2.9/ 5

.028"12.7mm, ⌀14x1.25HR 8

BR8HSA

Copper

-

2.9/ 5

.028"12.7mm, ⌀14x1.25HR 8

4092

Copper

-

2.9/ 5

.031"12.7mm, ⌀14x1.25HR 2

411

Copper

-

2.9/ 5

.024"12.7mm, ⌀14x1.25HR 1

L78C

Copper

-

2.9/ 5

.031"12.7mm, ⌀14x1.25HR 78

QL78C

Copper

-

2.9/ 5

.030"12.7mm, ⌀14x1.25HR 78

QL78YC

Copper

-

2.9/ 5

.024"12.7mm, ⌀14x1.25HR 78

UL81C

Copper

-

2.9/ 5

.024"12.7mm, ⌀14x1.25HR 81

275

Copper

-

2.9/ 5

.024"12.7mm, ⌀14x1.25HR 6

4093

Copper

-

2.9/ 5

.031"12.7mm, ⌀14x1.25HR 4

4123

Copper

-

2.9/ 5

.028"12.7mm, ⌀14x1.25HR 4

5883

Copper

-

2.9/ 5

.030"12.7mm, ⌀14x1.25HR 78

L78C MARINE

Copper

-

2.9/ 5

.031"12.7mm, ⌀14x1.25HR 78

L78C

Copper

-

2.9/ 5

.031"12.7mm, ⌀14x1.25HR 78

UL81C

Copper

-

2.9/ 5

.024"12.7mm, ⌀14x1.25HR 81

W24FSR

Copper

-

2.9/ 5

.028"12.7mm, ⌀14x1.25HR 24

B8HS

Copper

-

2.9/ 5

.024"12.7mm, ⌀14x1.25HR 8

B8HS-10

Copper

-

2.9/ 5

.039"12.7mm, ⌀14x1.25HR 8

B9HS

Copper

-

2.9/ 5

.028"12.7mm, ⌀14x1.25HR 9

B9HS-10

Copper

-

2.9/ 5

.039"12.7mm, ⌀14x1.25HR 9

BR8HS

Copper

-

2.9/ 5

.028"12.7mm, ⌀14x1.25HR 8

BR8HS-10

Copper

-

2.9/ 5

.039"12.7mm, ⌀14x1.25HR 8

BR8HSA

Copper

-

2.9/ 5

.028"12.7mm, ⌀14x1.25HR 8

BR9HS

Copper

-

2.9/ 5

.028"12.7mm, ⌀14x1.25HR 9

BR9HS-10

Copper

-

2.9/ 5

.039"12.7mm, ⌀14x1.25HR 9

B8HS

Copper

-

2.9/ 5

.024"12.7mm, ⌀14x1.25HR 8

411

Copper

-

2.9/ 5

.024"12.7mm, ⌀14x1.25HR 1

L78C

Copper

-

2.9/ 5

.031"12.7mm, ⌀14x1.25HR 78

UL81C

Copper

-

2.9/ 5

.024"12.7mm, ⌀14x1.25HR 81

4092

Copper

-

2.9/ 5

.031"12.7mm, ⌀14x1.25HR 2

5883

Copper

-

2.9/ 5

.030"12.7mm, ⌀14x1.25HR 78

L78C MARINE

Copper

-

2.9/ 5

.031"12.7mm, ⌀14x1.25HR 78

L78C

Copper

-

2.9/ 5

.031"12.7mm, ⌀14x1.25HR 78

UL81C

Copper

-

2.9/ 5

.024"12.7mm, ⌀14x1.25HR 81

W24FSR

Copper

-

2.9/ 5

.028"12.7mm, ⌀14x1.25HR 24

B8HS

Copper

-

2.9/ 5

.024"12.7mm, ⌀14x1.25HR 8

B8HS-10

Copper

-

2.9/ 5

.039"12.7mm, ⌀14x1.25HR 8

B9HS

Copper

-

2.9/ 5

.028"12.7mm, ⌀14x1.25HR 9

B9HS-10

Copper

-

2.9/ 5

.039"12.7mm, ⌀14x1.25HR 9

BR8HS

Copper

-

2.9/ 5

.028"12.7mm, ⌀14x1.25HR 8

BR8HS-10

Copper

-

2.9/ 5

.039"12.7mm, ⌀14x1.25HR 8

BR8HSA

Copper

-

2.9/ 5

.028"12.7mm, ⌀14x1.25HR 8

BR9HS

Copper

-

2.9/ 5

.028"12.7mm, ⌀14x1.25HR 9

BR9HS-10

Copper

-

2.9/ 5

.039"12.7mm, ⌀14x1.25HR 9

B7HS

Copper

-

2.9/ 5

.028"12.7mm, ⌀14x1.25HR 7

L78C MARINE

Copper

-

2.9/ 5

.031"12.7mm, ⌀14x1.25HR 78

L78C

Copper

-

2.9/ 5

.031"12.7mm, ⌀14x1.25HR 78

4092

Copper

-

2.9/ 5

.031"12.7mm, ⌀14x1.25HR 2

Bigger gap (1)

0.1..0.3 mm gap increase for better performance given your ignition system can handle it

R5525-8

Copper

3.2/ 5

.026"12.7mm, ⌀14x1.25HR 8

One step colder (1)

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

241256512

Copper

-

2.9/ 5

.020"12.7mm, ⌀14x1.25HR 3