What are the different spark plug thread sizes?

What are the different spark plug thread sizes?

Metric threads spark plugs according ISO 28741.

Size Major Diameter (mm) Minor Diameter1) (mm)
M10 x 1.0 10.0 9.153 – 8.917
M12 x 1.25 12.0 10.912 – 10.647
M14 x 1.25 14.0 12.912 – 12.647
M18 x 1.5 18.0 16.676 – 16.376

What does the letters on spark plugs mean?

[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.

How do you measure spark plug threads?

A spark plugs reach is calculated by the length of the threads. It is measured from the seat of the plug to the end of the threads; it does not include the electrodes, or an extended metal shell.

Are all spark plugs 14mm?

Most plugs these days are 14mm thread; however, 18mm and 7/8-inch threads have been used on many earlier vehicles, and you will see some 10mm or 12mm threads on newer imported motorcycles and small engines. Another important factor with spark plugs is the type of seat or sealing edge where the plug mates to the head.

What size thread is a NGK spark plug?

NGK Spark Plugs

Heat Range 17
Hex Size 13/16″ (20.6mm)
Reach 9.5mm (3/8″)
Seat Gasket seat
Thread Size 14mm

What are the 2 types of spark plugs?

Spark plug types

  • Copper spark plugs. Copper spark plugs have a copper core and use a nickel alloy on the working end of the electrode–the part that generates a spark.
  • Platinum spark plugs.
  • Iridium spark plugs.
  • Pulstar spark plugs.
  • Reducing emissions with every spark plug.

What’s the difference in spark plug types?

A standard spark plug typically features a nickel-alloy outer material fused to the copper-core electrodes. Copper spark plugs run cooler and provide more power in performance driving situations. They are often installed as original equipment in turbocharged engines and engines with higher compression ratios.

What does NGK stand for?

NGK Spark Plugs was founded as a spin-off of the spark plug division of NGK Insulators. Originally, NGK supplied most of its products to Japanese automakers. In 2018 the company became a shareholder of aftermarket data firm TecAlliance. NGK stands for Nihon Gaishi kabushikigaisha, the Japanese name of NGK Insulators.

What is the standard spark plug size?

Most spark plugs require a 5/8″ (16mm) size spark plug socket. This refers to the size of the flats on the spark plug that are in contact with the socket.

What does MP mean on a spark plug?

SparkPlugs.com: Manufacturer’s Numbering Systems.

What are the symptoms of a bad spark plug?

Hard to Start. Since a strong spark from the plugs is necessary to start the engine,one of the most obvious indications of faulty spark plugs is that the

  • Engine Misfires. Because a bad spark plug can cause incomplete burning of fuel in the combustion chamber,engine misfires can be the result.
  • Bad Fuel Economy.
  • Rough Idle.
  • Poor Acceleration.
  • Why are my spark plugs wet with oil?

    Worn or damaged pistons or valve guides allow oil into the combustion chamber, which drips onto the spark plugs. This causes oil-fouled spark plugs and is characterized by dark, wet, thick deposits on the tip of the plug. Carbon-fouled spark plugs are usually caused by a too-rich air/fuel mixture.

    What size socket is used for spark plugs?

    The size of the socket to be used is determined by the hex of the spark plug. Most spark plug sockets come in 2 sizes. These are 13/16 inches or 21 mm sockets and 5/8 inch or 16mm sockets. Sockets of 18mm size are also available even though they are not as common as the other two spark plug sockets.

    What size tap for spark plug holes?

    They are 14mm. The make hole chaser for spark plug holes. Every parts store should have it for about $5. There is also something called a back tap. It inserts into the hole. Then you expand it and it taps on the way out, bringing all the shavings along with it.