Bosch HR9HC+ 7981 Spark Plug

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Rating

2.9 / 5 Overall
Bosch	HR9HC+
Brand	Code
3.0 / 5 Materials
Copper	Copper
Ground electrode	Center electrode
2.8 / 5 Design
Standard	Standard
Ground type	Center type

Specifications

1.3mm (.050")	9
Gap	Heat range
⌀14mm	1.25mm
Thread diameter	Thread pitch
17.5mm (.689")	16mm (5/8")
Reach	Hex size
Tapered	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

TR5-1

Copper

3.1/ 5

.039"18mm, ⌀14x1.25HR 5

5144

Copper

-

2.9/ 5

.055"18mm, ⌀14x1.25HR 2

Deep reference (27)

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

IT20

Copper-Iridium

4.3/ 5

.043"17.5mm, ⌀14x1.25HR 20

IT20

Copper-Iridium

4.3/ 5

.043"17.5mm, ⌀14x1.25HR 20

VT20

Iridium-Platinum

4.2/ 5

.043"17.5mm, ⌀14x1.25HR 20

VT20

Iridium-Platinum

4.2/ 5

.043"17.5mm, ⌀14x1.25HR 20

T20EPR-U

Copper

3.3/ 5

.031"18mm, ⌀14x1.25HR 20

T20EPR-U

Copper

3.3/ 5

.031"18mm, ⌀14x1.25HR 20

TR5-1

Copper

3.1/ 5

.039"18mm, ⌀14x1.25HR 5

5144

Copper

-

2.9/ 5

.055"18mm, ⌀14x1.25HR 2

HR9LCX

Copper

-

2.9/ 5

.043"17.5mm, ⌀14x1.5HR 9

407C2

Copper

-

2.9/ 5

.043"18mm, ⌀14x1.25HR 14

RS14LC

Copper

-

2.9/ 5

.043"18mm, ⌀14x1.25HR 14

764

Copper

-

2.9/ 5

.045"17.5mm, ⌀14x1.25HR 2

2544

Copper

-

2.9/ 5

.045"18mm, ⌀14x1.25HR 2

2545

Copper

-

2.9/ 5

.045"18mm, ⌀14x1.25HR 3

2546

Copper

-

2.9/ 5

.055"18mm, ⌀14x1.25HR 4

5143

Copper

-

2.9/ 5

.055"18mm, ⌀14x1.25HR 1

2544BP

Copper

-

2.9/ 5

.045"18mm, ⌀14x1.25HR 2

2545BP

Copper

-

2.9/ 5

.045"18mm, ⌀14x1.25HR 3

2545DP2

Copper

-

2.9/ 5

.045"18mm, ⌀14x1.25HR 3

2546BP

Copper

-

2.9/ 5

.055"18mm, ⌀14x1.25HR 4

5144BP

Copper

-

2.9/ 5

.055"18mm, ⌀14x1.25HR 2

5144DP2

Copper

-

2.9/ 5

.055"18mm, ⌀14x1.25HR 2

764BP

Copper

-

2.9/ 5

.045"17.5mm, ⌀14x1.25HR 2

764DP2

Copper

-

2.9/ 5

.045"17.5mm, ⌀14x1.25HR 2

HR9LCX+

Copper

-

2.9/ 5

.043"17.5mm, ⌀14x1.25HR 9

RS10LC

Copper

-

2.9/ 5

.043"21mm, ⌀14x1.25HR 10

RS14LC

Copper

-

2.9/ 5

.043"18mm, ⌀14x1.25HR 14

One step colder (3)

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

HR8JII33V

Iridium

4.5/ 5

.050"17.5mm, ⌀14x1.25HR 8

HR8JPP33V

Platinum

3.8/ 5

.050"17.5mm, ⌀14x1.25HR 8

HR8JPP302V

Copper-Platinum

3.5/ 5

.050"17.5mm, ⌀14x1.25HR 8