![]() The deeper the insulator nose makes contact with the shell body, the hotter the heat range. The distance (depth) between the shell opening where the ground strap and center electrode are positioned to where the white insulator nose makes contact with the inner shell body determines the heat range of the spark plug. The insulator nose is the tapered portion of the ceramic insulator that projects to the shell opening. Not all companies use the same numbering convention, so it’s important to know when switching brands how each company’s heat range numbers are employed. In other words, a number 10 plug is much colder than a number 17 plug. With Brisk racing plugs, the heat range numbers run from cold to hot in ascending order. This refers to the plug’s ability to transfer heat from the white porcelain insulator to the cylinder head through the spark plug body.Īll spark plug companies, including Brisk, assign a number to the plug to represent its heat range. This is a good place to define what a spark plug’s heat range means. Once you have established the proper thread diameter, thread reach, and seat sealing type your engine requires, the heat range is the next important step. This leads us to the next topic of spark plug heat range. These two plugs are from the Brisk Premium LGS line. There are many subtle differences in thread reach that can present application problems if the proper specification is not used. Thread reach comparison between a Vortec head 0.708-inch reach spark plug (left) and an earlier GM iron -head 0.460-inch reach spark plug (right). This absolutely kills power and efficiency. This effectively shrouds the spark and does not allow the spark discharge of the spark plug good access to the air/fuel mixture. This spec is critical because if the plug’s reach is too short, the business end of the spark plug - the center electrode and ground strap - will be retracted from the cylinder inside the cylinder head threads. The thread reach numbers can vary widely based on the specific cylinder head in which the plugs will be used. The thread reach on a spark plug is defined as the length of the threads measured from the sealing portion of the plug body to the end of the threads. The two most common types are tapered seat (conical) or one that uses a metal crush gasket called a gasket seat.Īnother important specification when identifying the correct spark plug is the thread reach. The only disparity with thread pitch is with 10mm diameter plugs which have 1.0mm thread pitch (M10x1.0).The next area deals with the type of sealing surface to the cylinder head, commonly referred to as the spark plug seat. The next critical measurement is thread pitch, which is normally a 1.25mm thread pitch on both 12mm (M12x1.25) and 14mm (M14x1.25) plugs for most popular performance engines. A 14mm thread diameter will not thread into a cylinder head that requires a 12mm thread diameter spark plug and vice versa. Thread diameter is the overall measurement of the width of the threads on a bolt, it is important to make sure you are using the correct thread diameter for the cylinder head to ensure the plug is installed properly. The next important spec is the thread diameter. The most common hex size for today’s engines is a 5/8-inch or 16mm socket size. Let’s start with the spark plug main body configuration. Spark Plug Basicsīefore we break into that, let’s cover some generic spark plug designs that will help you understand the references. This will make it easier to understand how Brisk part numbers describe its line of spark plugs. The best place to start may be to take a common application and break down each of the letters and numbers to explain what they mean. This can seem complex until you understand how these letters and numbers are used. The focus of this story will be to break down many of the confusing terms into some simple facts that can lead you to make the right decision for your specific engine application.Įvery spark plug manufacturer has its own set of numbers and letters which identify its product features and usage. Brisk USA is a name that some may not have heard before, but the company has been around for many years, building a wide variety of performance spark plugs. A spark plug is one of those internal combustion engine components often surrounded by sometimes confusing nomenclature tied in with plenty of hearsay and lack of understanding.
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