What is the heat range of Autolite spark plugs?
Within the Autolite family, this particular plug is toward the hotter side of the range that runs (cold-to-hot) 3922 – 3923 – 3924 – 3926. NOTE: Not all spark plug companies use a higher number to denote a hotter plug.
Which autolite plug is hotter?
Autolite indicates the heat range with the last digit of the part number. For example, 3923 has a heat range of 3. The higher the number, the hotter the plug. The lower the number, the colder the plug.
What heat range is autolite 25?
For instance, starting with part # 24 (heat range 4), if you want a colder plug you would use part # 23 (heat range 3), for a hotter plug you would use part # 25 (heat range 5). Once you have decided on a number, test to see if it exists by typing it into the search box.
How do I know what heat range my spark plugs are?
The heat range is determined by the insulator nose length and its ability to absorb and transfer combustion heat, the gas volume around the insulator nose, and the materials/construction of the center electrode and porcelain insulator.In identical spark plug types, the difference from one heat range to the next is the …
Will a hotter spark plug stop fouling?
Yes, if your engine is burning oil a hotter plug is designed to burn off the excess oil and keep the spark plug from fouling.
What do the letters and numbers mean on a spark plug?
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.
What happens if you run too hot of a spark plug?
If the tip of the spark plug is too hot it can cause pre-ignition leading to detonation/knocking and damage may occur. If it is too cold, electrically conductive deposits may form on the insulator causing a loss of spark energy or the actual shorting-out of the spark current.
How can you tell which spark plug is hotter?