NGK SIMR8A9 Spark Plug

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Rating
Brand	Code
4.4 / 5 Overall
NGK	SIMR8A9
4.5 / 5 Materials
Platinum	Iridium
Ground electrode	Center electrode
4.3 / 5 Design
Square	Fine Wire
Ground type	Center type

Specifications
Gap	Heat range
0.9mm (.035")	8
⌀10mm	1mm
Thread diameter	Thread pitch
19mm (3/4")	16mm (5/8")
Reach	Hex size
Gasket	Threaded Stud
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 (1)

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

IU24

Copper-Iridium

4.3/ 5

.035"19mm, ⌀10x1HR 24

Deep reference (8)

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

DIMR8A10

Iridium-Platinum

4.7/ 5

.039"19mm, ⌀10x1HR 8

CR8EIX

Copper-Iridium

3.8/ 5

.031"19mm, ⌀10x1HR 8

PMR8A

Platinum

3.8/ 5

.028"19mm, ⌀10x1HR 8

PMR8B

Platinum

3.8/ 5

.028"19mm, ⌀10x1HR 8

RG6YC

Copper

3.3/ 5

.030"19mm, ⌀10x1HR 6

C8E

Copper

2.9/ 5

.031"19mm, ⌀10x1HR 8

CR8E

Copper

2.9/ 5

.031"19mm, ⌀10x1HR 8

CR8EB

Copper

2.9/ 5

.031"19mm, ⌀10x1HR 8

Same specs (1)

Products that have identical characteristics that impact interchangability

IMR8E-9HES

Iridium-Platinum

4.4/ 5

.035"19mm, ⌀10x1HR 8

One step colder (1)

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

IMR9E-9HES

Iridium-Platinum

4.4/ 5

.035"19mm, ⌀10x1HR 9