Table of Contents
When should a spark plug be hotter?
The spark plug tip temperature must remain between 930°F to 1560°F , regardless of the type of engine the plug is fitted in. If the tip temperature is lower than 930°F, the insulator area surrounding the center electrode will not be hot enough to burn off carbon and combustion chamber deposits.
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. Heat from the combustion chamber escapes through the exhaust gases, the side walls of the cylinder and the spark plug itself.
What is the heat range on a spark plug 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.
What is a hotter or colder spark plug?
The term colder plug and hotter plug refers to how fast or slow the plugs transfers the heat from the tip. A colder plug transfers heat faster while a hotter plug is slower. This temperature range is cool enough to prevent knock and not melt the plug tip, but still hot enough to burn off the carbon and prevent fouling.
What will a colder spark plug do?
The colder type removes heat more quickly, and will reduce the chance of pre-ignition/detonation and melting or damage to the firing end. (Engine temperature can affect the spark plug’s operating temperature, but not the spark plug’s heat range).
How do I know if my spark plug is too hot?
Blisters on the insulator tip, melted electrodes, or white deposits are signs of a burned spark plug that is running too hot. Causes can include the engine overheating, incorrect spark plug heat range, a loose spark plug, incorrect ignition timing or too lean of an air/fuel mixture.
How do I choose a hotter spark plug?
The higher the number, the hotter the plug. The lower the number, the colder the plug. 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).
How do spark plugs get hotter?
How do I know if my spark plugs are too hot?
Will a hotter spark plug burn fuel better?
A “hot” spark plug has a longer insulator that prevents heat transfer into the water jackets. It keeps more heat in the tip of the spark plug, which helps burn off combustion chamber deposits.
Is a 7 or 8 spark plug hotter?
(The 6 at the end of this part indicates the gap setting.) Champion plugs are hotter the higher the number, colder the lower the number. Starting with part # RCJ7Y (heat range 7), a colder plug would be # RCJ6Y (heat range 6), a hotter plug would be # RCJ8Y (heat range 8).