Table of Contents
What do NGK Spark Plug numbers mean?
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.
How do I know what spark plugs to get?
At the auto supply store, don’t just ask a salesperson which type of plug you should buy — you have a very good chance of getting the wrong one. First look up the specifications yourself, and then ask for the plug by number. If you’re unsure, have a salesperson double-check it for you.
What are the different types of NGK Spark Plugs?
Types of Spark Plugs
- Iridium spark plugs.
- Platinum spark plugs.
- Spark plugs with multiple ground electrodes.
- Spark plugs with V-groove in the center electrode.
- Spark plugs with supplementary spark gap.
- Semi-surface ignition type spark plugs.
- Hybrid spark plugs.
- Racing spark plugs.
Do NGK Spark Plugs make a difference?
This would be more accurately described as “less performance loss.” Spark plugs do not increase the performance of an engine — even spark plug manufacturers are fairly forthright about that. They won’t make the engine perform better than it did when it was new, but they will help it stay at that level longer.
What do NGK letters mean?
The first letter of the NGK spark plug code (in this case a “D”) indicates the thread size of the spark plug. The letter “J” indicates a 12 mm x 1.25 size with two ground electrodes. The “P” indicates a projected tip spark plug design that moves the spark deeper into the combustion chamber.
What does NGK 11 spark plug mean?
An example of an NGK racing plug is R5671A-11. Here, R5671A represents the plug type and -11 represents the heat range.
What’s better NGK iridium or platinum?
Iridium is said to be six times harder and eight times stronger than platinum with a 700° higher melting point. Iridium spark plugs have extremely fine electrodes while retaining excellent wear characteristics. Thanks to its strength, iridium spark plugs can last up to 25% longer than comparable platinum spark plugs.