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Codigo bujias NGK (manual imprescindible)
1992-93 NGK catalog 


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"

Other notes:
There's more, such as for metal shell plugs, "V-Power" plugs
for North American made cars, and other stuff. I'm not typing it in.

Some Motorcycle-related comments...

Some bikes use the DR8ES-L plug. Theres's no indication what the 'L'
means; it does not appear in the symbol chart for field six.

Seeing as I specialize in Honda V4 info...

ST1100 (hey, it's a V4) : CR8EH-9
VF1100 : DPR8EA-9
VF1000 : DPR8EA-9
VF750, VF700 : DPR8EA-9
VFR750, VFR700 : DPR9EA-9
VF500 : DPR8EA-9
VFR750R (1990) : CR9EH-9
VFR750F (1990) : CR9EH-9
VFR750F (1991-92) : CR8EH-9

Extended-life platinum tip plugs replacing the CR9EH-9 are
available as CR9EHVX-9.

Resistor plugs are used for two reasons --

 1. They cut down electrostatic interference.

 2. They provide a sharper "edge" to the voltage spike, making for
    a stronger, shorter spark. On high RPM motors, this is important.

The projected insulator simply describes the shape of the plug head.
A projected insulator sticks out a little further into the combustion

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