Table of Contents
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.
What does the 11 on the spark plug mean?
11 – Plug gap is 1.1mm.
What is the spark plug number?
The plug number is used to decode the spark plug and the stock number is used by our sales associates to aid in stock management, as alphanumeric numbers are harder to inventory. The stock number is a random 3-, 4- or 5-digit number and has no relation to heat range or plug type. An example is: DPR5EA-9; 2887.
How do you read a spark plug code?
“A” indicates a 12 mm x 1.25 with a 3/4″ reach. “Z” indicates a 10 mm x 1.0 with a 1/2″ reach. “G” indicates a 10 mm x 1.0 with a 3/4″ reach. The number (82 in this case) indicates the heat range of the spark plug, the higher the number the hotter the heat range (opposite of NGK and ND spark plugs).
What does R mean on a spark plug?
[R] Resistor – If an R is present, this indicates a resistor type spark plug. Resistor type spark plugs reduce the amount of radio frequency interference (RFI) that can cause ignition misfires and static on the radio. [V] Shell Design – This refers to the thread size and reach of the spark plug.
How do I know if my spark plug is lean or rich?
Good running conditions: If everything is good, the spark plug should have a tan/light brown color. Rich running conditions: If your engine is running too rich, the spark plug will be black and sooty. Lean running conditions: If your engine is running too lean, the spark plug will be white.
What does a white tip spark plug mean?
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. The spark plug should be replaced.
What spark plug is hotter 8 or 9?
On NGK spark plugs, the lower the number the hotter the plug (higher numbers are colder). It should be noted that the terms “hot” and “cold” do not refer to the temperature of the plug’s actual spark but the speed at which the plug transfers heat from the combustion chamber to the engine head.
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.
How do I choose a spark plug heat range?
According to Champion Spark Plugs, for normally aspirated, gasoline-fueled engines, a good rule of thumb is to go about one heat range colder for each full point in compression ratio increase from 9:1 through about 12.5:1, and two heat ranges colder for each point increase between 12.5:1 and 14.5:1.
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.
What does a brown spark plug mean?
Normal Condition If the firing end of a spark plug is brown or light gray, the condition can be judged to be good and the spark plug is functioning optimally.
What are the symptoms of a bad spark plug?
What are the signs your Spark Plugs are failing? Engine has a rough idle. If your Spark Plugs are failing your engine will sound rough and jittery when running at idle. Trouble starting. Car won’t start and you’re late for work… Flat battery? Engine misfiring. Engine surging. High fuel consumption. Lack of acceleration.
What do spark plugs look like when burning coolant?
The burned coolant leaves deposits on the electrodes and insulator, creating hot spots that could cause pre-ignition and a misfire code being set. When the plug is pulled, it might have a chalky appearance on the ground strap and center electrode.
Why do spark plugs get wet with oil?
Worn Piston Rings Each piston inside of your car’s engine has two compression rings and an oil control ring. If the rings are worn or stuck, oil will be able to enter the combustion chamber, resulting in wet oil and/or ash deposits on the tip of the spark plug.
What is the difference between NGK and NGK R?
Not sure if this has been answered but the only difference between the NGK and NGK-R is the R stand for resistor. It will supress electrical interference with electronics.
What does MP mean on a spark plug?
SparkPlugs.com: Manufacturer’s Numbering Systems.
What does the Q mean on a Champion spark plug?
“Q” Type: Uses a wire wound inductive coil (or electromagnetic suppression) to reduce RFI without negatively affecting ignition performance. “Q” type suppressor plugs are specified for most Evinrude and Johnson outboard engines with CDI. “X” Type: Have a special resistor to meet more stringent RFI requirements.
