Denso W14F-U Spark Plug

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Rating
Brand	Code
3.3 / 5 Overall
Denso	W14F-U
3.0 / 5 Materials
Copper	Copper
Ground electrode	Center electrode
4.0 / 5 Design
U-Groove	Standard
Ground type	Center type

Specifications
Gap	Heat range
0.7mm (.028")	14
⌀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

How we find alternative spark plugs How we rate spark plugs

Cross-reference (3)

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

W10AC

Copper

2.9/ 5

.020"12.7mm, ⌀14x1.25HR 10

425

Copper

2.9/ 5

.031"12.7mm, ⌀14x1.25HR 6

B-4H

Copper

2.9/ 5

.028"12.7mm, ⌀14x1.25HR 4

Deep reference (13)

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

W14FR-U

Copper

3.3/ 5

.028"12.7mm, ⌀14x1.25HR 14

425

Copper

2.9/ 5

.031"12.7mm, ⌀14x1.25HR 6

B-4H

Copper

2.9/ 5

.028"12.7mm, ⌀14x1.25HR 4

WR8AC+

Copper

2.9/ 5

.024"12.7mm, ⌀14x1.25HR 8

W10AC

Copper

2.9/ 5

.020"12.7mm, ⌀14x1.25HR 10

WR8AC

Copper

2.9/ 5

.024"12.7mm, ⌀14x1.25HR 8

5933

Copper

2.9/ 5

.030"12.7mm, ⌀14x1.25HR 86

L86C

Copper

2.9/ 5

.020"12.7mm, ⌀14x1.25HR 86

L90C

Copper

2.9/ 5

.020"12.7mm, ⌀14x1.25HR 90

BR4HS

Copper

2.9/ 5

.028"12.7mm, ⌀14x1.25HR 4

BR5HS

Copper

2.9/ 5

.024"12.7mm, ⌀14x1.25HR 5

W16FSR

Copper

2.9/ 5

.028"12.7mm, ⌀14x1.25HR 16

W10AC

Copper

2.9/ 5

.020"12.7mm, ⌀14x1.25HR 10

One step colder (1)

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

W16FS-U

Copper

3.3/ 5

.028"12.7mm, ⌀14x1.25HR 16

Two steps colder (1)

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

W20FS-U

Copper

3.3/ 5

.028"12.7mm, ⌀14x1.25HR 20