Bosch HR9DC+ 7978 Spark Plug

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Rating

2.9 / 5 Overall
Bosch	HR9DC+
Brand	Code
3.0 / 5 Materials
Copper	Copper
Ground electrode	Center electrode
2.8 / 5 Design
Standard	Standard
Ground type	Center type

Specifications

0.9mm (.035")	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 (1)

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

104

Copper

-

2.9/ 5

.050"17.5mm, ⌀14x1.25HR 2

Deep reference (13)

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

VT20

Iridium-Platinum

4.2/ 5

.043"17.5mm, ⌀14x1.25HR 20

T16EPR-U

Copper

3.3/ 5

.031"18mm, ⌀14x1.25HR 16

T20EPR-U

Copper

3.3/ 5

.031"18mm, ⌀14x1.25HR 20

T20EP-U

Copper

3.3/ 5

.031"18mm, ⌀14x1.25HR 20

HGR7KQC

Copper

3.2/ 5

.063"17.5mm, ⌀14x1.25HR 7

BP6EF

Copper

3.1/ 5

.028"18mm, ⌀14x1.25HR 6

HR8DC+ NS

Copper

-

2.9/ 5

.031"17.5mm, ⌀14x1.25HR 8

HR8DCX

Copper

-

2.9/ 5

.043"17.5mm, ⌀14x1.25HR 8

H9DC

Copper

-

2.9/ 5

.031"17.5mm, ⌀14x1.5HR 9

HR8DCX+

Copper

-

2.9/ 5

.043"17.5mm, ⌀14x1.25HR 8

RS14YC

Copper

-

2.9/ 5

.045"17.5mm, ⌀14x1.25HR 14

BPR6EFS

Copper

-

2.9/ 5

.031"18mm, ⌀14x1.25HR 6

Bigger gap (4)

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

HR9LII33X

Iridium

4.5/ 5

.043"17.5mm, ⌀14x1.25HR 9

HR9LPP33X

Platinum

3.8/ 5

.043"17.5mm, ⌀14x1.25HR 9

HR9LPP30X

Copper-Platinum

3.5/ 5

.043"17.5mm, ⌀14x1.25HR 9

HR9DCX+

Copper

-

2.9/ 5

.043"17.5mm, ⌀14x1.25HR 9