Champion D78Y Spark Plug

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Rating

2.8 / 5 Overall
Champion	D78Y
Brand	Code
3.0 / 5 Materials
Copper	Copper
Ground electrode	Center electrode
2.3 / 5 Design
Standard	Oversized
Ground type	Center type

Specifications

0.4mm (.016")	78
Gap	Heat range
⌀18mm	1.5mm
Thread diameter	Thread pitch
12.7mm (1/2")	22mm (7/8")
Reach	Hex size
Gasket	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

AB-6

Copper

2.9/ 5

.028"11mm, ⌀18x1.5HR 6

Deep reference (12)

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

D16J

Copper

3.1/ 5

.030"12.7mm, ⌀18x1.5HR 16

386

Copper

2.9/ 5

.024"12.7mm, ⌀18x1.5HR 4

3116

Copper

2.9/ 5

.035"12.7mm, ⌀18x1.5HR 5

D21

Copper

2.9/ 5

.028"12.7mm, ⌀18x1.5HR 21

D23

Copper

2.9/ 5

.030"12.7mm, ⌀18x1.5HR 23

M17

Copper

2.9/ 5

.028"12mm, ⌀18x1.5HR 17

UD16

Copper

-

2.8/ 5

.026"12.7mm, ⌀18x1.5HR 16

D16

Copper

-

2.8/ 5

.026"12.7mm, ⌀18x1.5HR 16

D9

Copper

-

2.8/ 5

.026"12.7mm, ⌀18x1.5HR 9

RD16

Copper

-

2.8/ 5

.026"12.7mm, ⌀18x1.5HR 16

D-14

Copper

-

2.8/ 5

.026"12.7mm, ⌀18x1.5HR 14

D18Y

Copper

-

2.8/ 5

.028"12.7mm, ⌀18x1.5HR 18

Bigger gap (2)

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

D15Y

Copper

-

2.8/ 5

.028"12.7mm, ⌀18x1.5HR 15

RD15Y

Copper

-

2.8/ 5

.026"12.7mm, ⌀18x1.5HR 15