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Champion UL81C Spark Plug

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Rating
2.9 / 5
Overall
Champion UL81C
Brand Code
3.0 / 5
Materials
Copper Copper
Ground electrode Center electrode
2.8 / 5
Design
Standard Standard
Ground type Center type
Specifications
0.6mm (.024") 81
Gap Heat range
⌀14mm 1.25mm
Thread diameter Thread pitch
12.7mm (1/2") 21mm (13/16")
Reach Hex size
Gasket Solid
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 (5)

Alternative spark plugs found in cross-reference docs provided by manufacturers
Copper-Iridium
4.3 / 5
.031" 12.7mm, ⌀14x1.25 HR 24
Iridium-Platinum
4.2 / 5
.031" 12.7mm, ⌀14x1.25 HR 2
Copper
3.3 / 5
.028" 12.7mm, ⌀14x1.25 HR 24
Copper
-
2.9 / 5
.031" 12.7mm, ⌀14x1.25 HR 2
Copper
-
2.9 / 5
.028" 12.7mm, ⌀14x1.25 HR 7

Deep reference (87)

A second level of cross-reference: if A=B and B=C, then A=C
Copper-Iridium
4.3 / 5
.031" 12.7mm, ⌀14x1.25 HR 27
Copper-Iridium
4.3 / 5
.031" 12.7mm, ⌀14x1.25 HR 24
Copper-Iridium
4.3 / 5
.031" 12.7mm, ⌀14x1.25 HR 22
Iridium-Platinum
4.2 / 5
.031" 12.7mm, ⌀14x1.25 HR 4
Iridium-Platinum
4.2 / 5
.031" 12.7mm, ⌀14x1.25 HR 2
Iridium-Platinum
4.2 / 5
.031" 12.7mm, ⌀14x1.25 HR 4
Copper-Iridium
3.8 / 5
.031" 12.7mm, ⌀14x1.25 HR 8
Copper-Iridium
3.8 / 5
.031" 12.7mm, ⌀14x1.25 HR 8
Copper-Iridium
3.8 / 5
.031" 12.7mm, ⌀14x1.25 HR 9
Copper-Iridium
3.8 / 5
.031" 12.7mm, ⌀14x1.25 HR 8
Copper-Iridium
3.8 / 5
.031" 12.7mm, ⌀14x1.25 HR 7
Copper-Iridium
3.8 / 5
.031" 12.7mm, ⌀14x1.25 HR 9
Copper-Iridium
3.8 / 5
.031" 12.7mm, ⌀14x1.25 HR 8
Copper
3.3 / 5
.028" 12.7mm, ⌀14x1.25 HR 24
Copper
3.3 / 5
.039" 12.7mm, ⌀14x1.25 HR 27
Copper
3.3 / 5
.028" 12.7mm, ⌀14x1.25 HR 24
Copper
3.3 / 5
.039" 12.7mm, ⌀14x1.25 HR 27
Copper
3.2 / 5
.026" 12.7mm, ⌀14x1.25 HR 8
Copper
3.2 / 5
.016" 12.7mm, ⌀14x1.25 HR 8
Copper
3.2 / 5
.016" 12.7mm, ⌀14x1.25 HR 8
Copper
3.2 / 5
.059" 12.7mm, ⌀14x1.25 HR 16
Copper
3.2 / 5
.016" 12.7mm, ⌀14x1.25 HR 8
Copper
3.2 / 5
.016" 12.7mm, ⌀14x1.25 HR 8
Copper
3.2 / 5
.059" 12.7mm, ⌀14x1.25 HR 16
Copper
3.1 / 5
.039" 12.7mm, ⌀14x1.25 HR 8
Copper
3.1 / 5
.039" 12.7mm, ⌀14x1.25 HR 8
Copper
-
2.9 / 5
.020" 12.7mm, ⌀14x1.25 HR 4
Copper
-
2.9 / 5
.024" 12.7mm, ⌀14x1.25 HR 8
Copper
-
2.9 / 5
.028" 12.7mm, ⌀14x1.25 HR 8
Copper
-
2.9 / 5
.039" 12.7mm, ⌀14x1.25 HR 8
Copper
-
2.9 / 5
.059" 12.7mm, ⌀14x1.25 HR 8
Copper
-
2.9 / 5
.028" 12.7mm, ⌀14x1.25 HR 8
Copper
-
2.9 / 5
.028" 12.7mm, ⌀14x1.25 HR 8
Copper
-
2.9 / 5
.028" 12.7mm, ⌀14x1.25 HR 8
Copper
-
2.9 / 5
.031" 12.7mm, ⌀14x1.25 HR 2
Copper
-
2.9 / 5
.024" 12.7mm, ⌀14x1.25 HR 1
Copper
-
2.9 / 5
.031" 12.7mm, ⌀14x1.25 HR 78
Copper
-
2.9 / 5
.030" 12.7mm, ⌀14x1.25 HR 78
Copper
-
2.9 / 5
.024" 12.7mm, ⌀14x1.25 HR 78
Copper
-
2.9 / 5
.024" 12.7mm, ⌀14x1.25 HR 6
Copper
-
2.9 / 5
.031" 12.7mm, ⌀14x1.25 HR 4
Copper
-
2.9 / 5
.028" 12.7mm, ⌀14x1.25 HR 4
Copper
-
2.9 / 5
.020" 12.7mm, ⌀14x1.25 HR 4
Copper
-
2.9 / 5
.030" 12.7mm, ⌀14x1.25 HR 78
Copper
-
2.9 / 5
.031" 12.7mm, ⌀14x1.25 HR 78
Copper
-
2.9 / 5
.031" 12.7mm, ⌀14x1.25 HR 78
Copper
-
2.9 / 5
.028" 12.7mm, ⌀14x1.25 HR 24
Copper
-
2.9 / 5
.024" 12.7mm, ⌀14x1.25 HR 8
Copper
-
2.9 / 5
.039" 12.7mm, ⌀14x1.25 HR 8
Copper
-
2.9 / 5
.028" 12.7mm, ⌀14x1.25 HR 9
Copper
-
2.9 / 5
.039" 12.7mm, ⌀14x1.25 HR 9
Copper
-
2.9 / 5
.028" 12.7mm, ⌀14x1.25 HR 8
Copper
-
2.9 / 5
.039" 12.7mm, ⌀14x1.25 HR 8
Copper
-
2.9 / 5
.028" 12.7mm, ⌀14x1.25 HR 8
Copper
-
2.9 / 5
.028" 12.7mm, ⌀14x1.25 HR 9
Copper
-
2.9 / 5
.039" 12.7mm, ⌀14x1.25 HR 9
Copper
-
2.9 / 5
.020" 12.7mm, ⌀14x1.25 HR 4
Copper
-
2.9 / 5
.024" 12.7mm, ⌀14x1.25 HR 8
Copper
-
2.9 / 5
.024" 12.7mm, ⌀14x1.25 HR 1
Copper
-
2.9 / 5
.031" 12.7mm, ⌀14x1.25 HR 78
Copper
-
2.9 / 5
.031" 12.7mm, ⌀14x1.25 HR 2
Copper
-
2.9 / 5
.020" 12.7mm, ⌀14x1.25 HR 4
Copper
-
2.9 / 5
.030" 12.7mm, ⌀14x1.25 HR 78
Copper
-
2.9 / 5
.031" 12.7mm, ⌀14x1.25 HR 78
Copper
-
2.9 / 5
.031" 12.7mm, ⌀14x1.25 HR 78
Copper
-
2.9 / 5
.028" 12.7mm, ⌀14x1.25 HR 24
Copper
-
2.9 / 5
.024" 12.7mm, ⌀14x1.25 HR 8
Copper
-
2.9 / 5
.039" 12.7mm, ⌀14x1.25 HR 8
Copper
-
2.9 / 5
.028" 12.7mm, ⌀14x1.25 HR 9
Copper
-
2.9 / 5
.039" 12.7mm, ⌀14x1.25 HR 9
Copper
-
2.9 / 5
.028" 12.7mm, ⌀14x1.25 HR 8
Copper
-
2.9 / 5
.039" 12.7mm, ⌀14x1.25 HR 8
Copper
-
2.9 / 5
.028" 12.7mm, ⌀14x1.25 HR 8
Copper
-
2.9 / 5
.028" 12.7mm, ⌀14x1.25 HR 9
Copper
-
2.9 / 5
.039" 12.7mm, ⌀14x1.25 HR 9
Copper
-
2.9 / 5
.028" 12.7mm, ⌀14x1.25 HR 7
Copper
-
2.9 / 5
.031" 12.7mm, ⌀14x1.25 HR 2
Copper
-
2.9 / 5
.031" 12.7mm, ⌀14x1.25 HR 4
Copper
-
2.9 / 5
.031" 12.7mm, ⌀14x1.25 HR 78
Copper
-
2.9 / 5
.031" 12.7mm, ⌀14x1.25 HR 78
Copper
-
2.9 / 5
.031" 12.7mm, ⌀14x1.25 HR 82
Copper
-
2.9 / 5
.031" 12.7mm, ⌀14x1.25 HR 82
Copper
-
2.9 / 5
.024" 12.7mm, ⌀14x1.25 HR 81
Copper
-
2.9 / 5
.031" 12.7mm, ⌀14x1.25 HR 78
Copper
-
2.9 / 5
.031" 12.7mm, ⌀14x1.25 HR 2
Copper
-
2.9 / 5
.031" 12.7mm, ⌀14x1.25 HR 4
Copper
-
2.9 / 5
.031" 12.7mm, ⌀14x1.25 HR 82

Same specs (5)

Products that have identical characteristics that impact interchangability
Platinum
3.6 / 5
.024" 12.7mm, ⌀14x1.25 HR 77
Copper
-
2.9 / 5
.024" 12.7mm, ⌀14x1.25 HR 1
Copper
-
2.9 / 5
.024" 12.7mm, ⌀14x1.25 HR 5
Copper
-
2.9 / 5
.024" 12.7mm, ⌀14x1.25 HR 81
Copper
-
2.9 / 5
.024" 12.7mm, ⌀14x1.25 HR 86

Bigger gap (26)

0.1..0.3 mm gap increase for better performance given your ignition system can handle it
Iridium-Platinum
4.2 / 5
.031" 12.7mm, ⌀14x1.25 HR 2
Iridium-Platinum
4.2 / 5
.031" 12.7mm, ⌀14x1.25 HR 2
Iridium-Platinum
4.2 / 5
.031" 12.7mm, ⌀14x1.25 HR 4
Iridium-Platinum
4.2 / 5
.031" 12.7mm, ⌀14x1.25 HR 4
Copper
-
2.9 / 5
.031" 12.7mm, ⌀14x1.25 HR 82
Copper
-
2.9 / 5
.035" 12.7mm, ⌀14x1.25 HR 77
Copper
-
2.9 / 5
.030" 12.7mm, ⌀14x1.25 HR 86
Copper
-
2.9 / 5
.030" 12.7mm, ⌀14x1.25 HR 86
Copper
-
2.9 / 5
.030" 12.7mm, ⌀14x1.25 HR 78
Copper
-
2.9 / 5
.030" 12.7mm, ⌀14x1.25 HR 82
Copper
-
2.9 / 5
.030" 12.7mm, ⌀14x1.25 HR 78
Copper
-
2.9 / 5
.030" 12.7mm, ⌀14x1.25 HR 78
Copper
-
2.9 / 5
.030" 12.7mm, ⌀14x1.25 HR 82
Copper
-
2.9 / 5
.030" 12.7mm, ⌀14x1.25 HR 82
Copper
-
2.9 / 5
.031" 12.7mm, ⌀14x1.25 HR 82
Copper
-
2.9 / 5
.031" 12.7mm, ⌀14x1.25 HR 78
Copper
-
2.9 / 5
.031" 12.7mm, ⌀14x1.25 HR 82
Copper
-
2.9 / 5
.031" 12.7mm, ⌀14x1.25 HR 2
Copper
-
2.9 / 5
.031" 12.7mm, ⌀14x1.25 HR 78
Copper
-
2.9 / 5
.031" 12.7mm, ⌀14x1.25 HR 78
Copper
-
2.9 / 5
.030" 12.7mm, ⌀14x1.25 HR 86
Copper
-
2.9 / 5
.030" 12.7mm, ⌀14x1.25 HR 78
Copper
-
2.9 / 5
.031" 12.7mm, ⌀14x1.25 HR 3
Copper
-
2.9 / 5
.031" 12.7mm, ⌀14x1.25 HR 4
Copper
-
2.9 / 5
.031" 12.7mm, ⌀14x1.25 HR 4
Copper
-
2.9 / 5
.031" 12.7mm, ⌀14x1.25 HR 2