What does the number mean on NGK Spark Plugs?

What does the number mean on NGK Spark Plugs?

The heat rating is a measure of the amount of heat dissipation. The heat rating of each NGK spark plug is indicated by a number; lower numbers indicate a hotter type, higher numbers indicate a colder type.

What do the letters mean on a spark plug?

The letter “P” indicates a platinum center electrode. The letter “S” indicates a copper center core. The letter “V” indicates a fine wire gold palladium center electrode. The letter “Y” indicates a V-grooved center electrode. The number after the – indicates the recommended spark plug gap in tenths of a millimeter.

What is the difference between NGK BKR5e and BKR6e?

Registered. the difference between a BKR6e and a BKR5e is that the 6 is a colder plug. On NGK the higher the number the colder the plug.

How can you tell what size a spark plug is?

The first letter of the ND spark plug code (in this case an “X”) indicates the thread size of the spark plug. There are three size spark plug threads currently being used in motorcycles and ATVs. “W” indicates a 14 mm x 1.25 pitch size, “X” indicates a 12 mm x 1.25 size and “U” indicates a 10 mm x 1.0 size.

Why use a hotter or colder spark plug?

Air/fuel mixture: Lean air/fuel ratios raise cylinder-head temperatures, requiring a colder plug. Rich air/fuel ratios require a hotter plug to prevent fouling. Mixtures that cause the plugs to read lean may contribute to pre-ignition or detonation.

When should a spark plug be hotter?

1. Air/Fuel Mixture: Lean air/fuel ratios raise cylinder-head temperatures, requiring a colder plug. Rich air/fuel ratios require a hotter plug to prevent fouling. Mixtures that cause the plugs to read lean might contribute to preignition or detonation.

What thread pitch is a spark plug?

Identifying NGK Spark Plugs

Letter Thread Pitch
A 18mm 1.50mm
B 14mm 1.25mm
C 10mm 1.00mm
D 12mm 1.25mm

What size thread is a NGK spark plug?

0.551″
Spark Plug, 0.551″ Thread Size, Ceramic.