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NGK Sparkplug Codes

The document provides information about the coding system used for NGK spark plugs. It breaks down the six fields of a typical NGK spark plug code. Field one indicates thread diameter, field two is construction type, field three is heat range, field four is thread reach, field five is firing end construction, and field six after the dash indicates the spark plug's gap width.

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Wesdi D
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284 views2 pages

NGK Sparkplug Codes

The document provides information about the coding system used for NGK spark plugs. It breaks down the six fields of a typical NGK spark plug code. Field one indicates thread diameter, field two is construction type, field three is heat range, field four is thread reach, field five is firing end construction, and field six after the dash indicates the spark plug's gap width.

Uploaded by

Wesdi D
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as DOCX, PDF, TXT or read online on Scribd
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NGK SPARKPLUG CODES

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Here is the table of values for NGK spark plug names.

The breakdown is like this: [B] [CPR] [6] [E] [S] - [11]

Six fields. Some, e.g. the second field, are optional.

Some fields may have multiple letters.

Field one: Thread diameter.

A = 18mm B = 14mm C = 10mm D = 12mm

Field two: Construction.

C = hex size 5/8" K = hex size 5/8 with projected tip (ISO)

M = compact type P = projected insulator type

R = resistor SD = surface discharge for rotary engines

U = semi-surface discharge Z = inductive suppressor

Field three: Heat Range.

2 = hot, up to 10 = cold. There's no 1, I guess.

Field four: Thread reach.

E = 19mm F = tapered seat

H = 12.7mm (1.5") L = 11.2mm (7/16")

If this field is blank, an 18mm diameter plug has 12mm reach,

and a 14mm plug has a 9.5mm (3/8") reach.

Field Five: Firing end construction.

A, B = special design (no details given)

C = special ground electrode

G = racing use
GV = racing use V type

H = half thread

K = 2 ground electrodes for certain Toyotas

L = half heat range

LM = compact lawn mower type

M = 2 ground electrodes for Mazda rotary engine

N = special ground electrode

P = platinum tip (premium)

Q = 4 ground electrodes

R = delta ground electrode for BMW

S = standard 2.6mm centre electrode

T = 3 ground electrodes

V = fine-wire centre electrode, gold palladium

VX = platinum tip (high performance)

W = tungsten electrode

X = booster gap

Y = v-groove centre electrode

Field Six: (after the dash) Wide gap.

8 = .032" 9 = .036" 10 = .040"

11 = .044" there is no 12 13 = .050"

14 = .055" 15 = .060" 20 = .080"

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