NGK MR7F Spark Plug

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Rating
Brand	Code
2.9 / 5 Overall
NGK	MR7F
3.0 / 5 Materials
Copper	Copper
Ground electrode	Center electrode
2.8 / 5 Design
Standard	Standard
Ground type	Center type

Specifications
Gap	Heat range
0.8mm (.031")	7
⌀10mm	1mm
Thread diameter	Thread pitch
19mm (3/4")	16mm (5/8")
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 (2)

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

RG4PHP

Platinum

3.6/ 5

.020"19mm, ⌀10x1HR 4

RG4YCX

Copper

2.9/ 5

.030"19mm, ⌀10x1HR 4

Deep reference (3)

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

IU27

Copper-Iridium

4.3/ 5

.035"19mm, ⌀10x1HR 27

PMR8A

Platinum

3.8/ 5

.028"19mm, ⌀10x1HR 8

CR9EIX

Copper-Iridium

3.8/ 5

.031"19mm, ⌀10x1HR 9

Bigger gap (2)

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

CPR7EAIX-9

Copper-Iridium

3.8/ 5

.035"19mm, ⌀10x1HR 7

CPR7EA-9

Copper

2.9/ 5

.035"19mm, ⌀10x1HR 7

One step colder (1)

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

MR8F

Copper

2.9/ 5

.031"19mm, ⌀10x1HR 8

Two steps colder (1)

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

MR9F

Copper

2.9/ 5

.031"19mm, ⌀10x1HR 9