What do numbers on spark plugs mean?

The heat rating is a measure of the amount of heat dissipation. The heat range of a spark plug is the range in which the plug works well thermally. 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.

Click to read in-depth answer. In this regard, what do the numbers mean on NGK Spark Plugs?

Typically the heat range for NGK Spark Plugs varies from 2-11. This number indicates the thermal characteristics of a spark plug, or how ‘hot’ or ‘cold’ a spark plug is. This means the spark plug will heat up easily and reach its optimal operating temperature.

Furthermore, how do you read NGK plugs? How you crack the NGK code

Considering this, what do the letters and numbers on spark plugs mean?

What does R mean in NGK Spark Plugs?

resistor spark plugs

What size socket do I need for NGK Spark Plugs?

A plugs hex size determines the socket required for installation. While 5/8″ (16mm) and 13/16″ are the two most common plug hex sizes, plugs can have a hex as small as 8mm or larger than 1″.

Are NGK good spark plugs?

NGK (5464) BKR5EIX-11 Iridium IX Spark Plug

Here is another really good spark plug from NGK. They are specifically made to install very easily on today’s higher performance type engines. The other is that they are made to be used in high-performance engines and they work really well in them.

What size is a NGK Spark Plug?

NGK Spark Plugs Spark Plugs – 14mm Spark Plug Thread Size – 19mm Spark Plug Reach – Free Shipping on Orders Over $99 at Summit Racing.

What does the Q stand for in Champion spark plugs?

The recommnded plugs are Champion QL77JC4 (Q is copper core, I think) and L78V. These plugs are almost the same heat range.

What does running a hotter spark plug do?

A projected plugs longer core nose provides a hotter plug at low speed to help prevent fouling. As engine speed increases, the incoming air/fuel mixture flows across the core nose tip, providing charge cooling that effectively reduces the heat range for increased top-end detonation resistance.

How do you tighten spark plugs?

Tapered-seat spark plugs should be installed by hand until finger-tight. Then use an additional 1/16th turn applied with a spark plug wrench to ensure the spark plug has been tightened to the manufacturer’s recommendation for a 14mm thread.

What is the tip of a spark plug called?

A spark plug is made of a center electrode, an insulator, a metal casing or shell, and a side electrode (also called a ground electrode). The tips of the side and center electrodes are about 0.020 – 0.080 inch apart from each other (depending on the type of engine), creating the gap for the spark to jump across.

What do fouled spark plugs look like?


Normal spark plug deposits are typically light tan or brown in color. Black deposits or heavy ash deposits usually indicates trouble. Some common causes of spark plug fouling include: Worn or damaged valve guides or valve guide seals.

Can bad spark plugs cause smoke?

Spark plugs will not cause the motor to smoke, good or bad. Whitish gray smoke sounds like a fueling problem.

What is the heat range number on a spark plug?

Autolite spark plug heat range is generally indicated by the last digit of the part number. Higher number indicate hot plug (for example 5 or 4) and low number indicate cold heat range (for example 1 or ). Spark plug heat range is the measure of how fast the spark plug tip dissipates combustion heat.

What color should the spark be on a spark plug?

The strength of the spark is revealed in the color. A red or yellow spark is weak and probably will not spark in the cylinder. A blue or white spark is strong and has enough voltage to fight across the spark plug gap even under pressure within the cylinder.

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