What do the letters mean on spark plugs?
[YC] Firing End Design – The letters after the heat rating indicates a special spark plug construction feature called the firing end design. The letters refer to the center electrode material, projection dimension and ground material.
Is there a spark plug code?
The first letter of the NGK spark plug code (in this case a “D”) indicates the thread size of the spark plug. There are three spark plug thread sizes currently being used in motorcycles and ATVs. “B” indicates a 14 mm x 1.25 pitch size, “D” indicates a 12 mm x 1.25 size and “C” indicates a 10 mm x 1.0 size.
What does the 11 mean on NGK spark plugs?
An example of an NGK racing plug is R5671A-11. Here, R5671A represents the plug type and -11 represents the heat range.
How are the spark plugs numbered?
The terminals are numbered either clockwise or counterclockwise, depending on which engine you are working on. For example, on a Chevy, the No. 1 terminal is at approximately 5 o’clock, and the No. 2 terminal is to its left, then the No.
What does NGK R stand for?
you are correct it stands for resistor.
What sensor is used to detect engine misfire?
crankshaft position sensor
The OBD II system detects misfires on most vehicles by monitoring variations in the speed of the crankshaft through the crankshaft position sensor. A single misfire will cause a subtle change in the speed of the crank.
What do NGK part numbers 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.
What is the correct firing order?
Straight-four engines typically use a firing order of 1-3-4-2, however some British engines used a firing order of 1-2-4-3. Flat-four engines typically use a firing order of R1-R2-L1-L2. Straight-five engines typically use a firing order of 1-2-4-5-3, in order to minimise the primary vibration from the rocking couple.
What do the spark plug codes on a motorcycle mean?
Here are the most common spark plug codes by brand. NGK is the largest manufacturer of spark plugs for motorcycles and ATVs in the world, and come as original equipment on many vehicles. Here is an example of their basic spark plug code. The first letter of the NGK spark plug code (in this case a “D”) indicates the thread size of the spark plug.
What do the letters on spark plugs mean?
The “P” indicates a projected tip spark plug design (1.5 mm projection) that moves the spark deeper into the combustion chamber. The letter “S” in this location indicates it is a standard (non-projected tip) type, while the letter “X” indicates a 2.5 mm projected tip.
How do you read a spark plug code with no number?
If there is no number at the end of the spark plug code, it should be gapped to .7 mm or .028″ unless specified differently by the vehicle manufacturer. Here is an example of the Nippon Denso basic spark plug code. The first letter of the ND spark plug code (in this case an “X”) indicates the thread size of the spark plug.
What is the stock number for spark plugs?
The stock number is 6596. NGK lists a design symbols chart in the front of every spark plug catalog.