- MGB Spark Plugs, a product line from NGK, a Japanese company with a global presence, are known for their precision engineering and reliability. They are designed to ignite the air-fuel mixture inside the engine's combustion chamber, thereby starting the combustion process that propels the vehicle forward. This seemingly simple task is, in fact, a complex operation that requires precise timing and high voltage discharge, both of which NGK spark plugs excel at.
- On the other hand, Apache Spark is a popular distributed computing framework known for its speed, simplicity, and versatility. It supports a wide range of data processing tasks, including SQL queries, streaming, machine learning, and graph processing. Spark's ability to process data in memory makes it particularly well-suited for real-time data processing tasks that require fast response times.
The ignition spark plug is essentially a small device that is screwed into the cylinder head of the engine. It consists of a central electrode, an insulator, and a ground electrode. When the engine's piston compresses the air-fuel mixture in the cylinder, the spark plug creates a spark that ignites the mixture, causing combustion to occur.


In motor vehicles, spark plugs play a critical role in igniting the air-fuel mixture within the engine cylinders. High-quality iridium spark plugs are designed to provide reliable ignition, efficient combustion, and consistent performance, contributing to the overall efficiency and longevity of the vehicle. The use of iridium spark plugs in motor vehicles can lead to improved throttle response, smoother acceleration, and reduced emissions, enhancing the driving experience and environmental impact.
2) Special seal types and their features
Valve cover gaskets and head gaskets play pivotal roles in maintaining the proper functioning of the engine. The valve cover gasket prevents oil leaks and contaminants from compromising the lubrication and performance of the engine, while the head gasket ensures the proper sealing of the combustion chamber, allowing for efficient fuel combustion and preventing the mixing of oil and coolant. Both gaskets are critical for the overall efficiency, performance, and reliability of the engine.

NNK belongs to NOK-CN factory, we have more than 150 employees and strong delivery capacity. Our technicians are experienced, we have been committed to the sealing industry for decades, and have independent research and development capabilities. Our metal shells are produced by ourselves, and the quality is guaranteed. Our rubbers are all imported materials, and each product is strictly tested.If you need please contact us.
Requirements of the shaft
Even more important than a correct interference fit of the Oil Seal is a perfectly smooth shaft in the region of the seal, particularly if shaft surface speed is high and the medium to be sealed is under a certain amount of excess pressure. The surface roughness of the shaft depends on the average profile depth Ra of the tool marks caused by the machining process. Oil Seals made of PTFE require, independent of the surface speed, a surface roughness of between 0,1 to 0,2 mm, because PTFE has less wear resistance than rubber seals. For normal circumstances, the shaft in the region of the seal must have a surface roughness of approximately: To summarize, the surface of the shaft in the region of the seal should not have noticeable machining marks. For pivoting shafts and other difficult or critical sealing applications, it is recommended that Oil Seals with a helical groove hydrodynamic pattern, which has a pumping effect, be used. When grinding and polishing, an axial movement of the grindstone along the shaft must be avoided in order to prevent machine lay.
Above, are all the components of an oil seal and all its naming conventions. Beyond selecting the correct size, the three primary selection criteria are Material, Lip, and Case. If you have an oil seal you’d like custom designed and made, send us your specifications through our Oil Seal Design Form.
Table 2 a): Common types of oil seals (with spring)
Silicone
Wide temperature range
Commonly used in low temperature applications
Very prone to mechanical damage during fitting