The resistor in the spark plug reduces this energy before it causes interference with other electrical components.įouling: Fouling occurs when a plug becomes contaminated with fuel, oil, or other contaminates that prevent the plug from generating a spark. If this energy was to travel through the ignition wires, it could cause interference with other sensitive electronic devices, such as the radio or electronic control units. Radio Frequency Interference (RFI): When the spark plug creates a spark, a high frequency burst of energy is created. For some newer cars, resistor plugs are required for effective communication between the plugs and the electronic ignition. These pulses can cause Radio Frequency Interference (RFI) with electrical components in the car. This seal acts as a resistor in the plug which reduces the transmission of pulses of energy to the ignition cables. Resistor (The "R" printed on the insulator) Many spark plugs have a special conductive glass seal between the center electrode and the terminal stud. Pre-ignition can, and usually does, eventually lead to knocking. This can happen only a couple of degrees before the spark plug fires, so it is possible to have pre-ignition and not know it. Preigntion occurs when the spark plug (or somthing else in the cylinder) gets too hot and ignites the air/fuel mixture before the spark does. Knocking occurs when the combustion flame happens much too early, causing the flame front to "slap" the piston. Knocking and Preignition: These are SEPERATE events. However, they can have a decrease in igniteability, reducing performance slightly. Multi Ground strap plugs: Ever wonder what good the multiple ground strap plugs, such as bosch platinum +4, are good for? These plugs have a bit longer life and a higher fouling resistance.
The corrugations essentially increase the surface distance from the tip to the ground of the plug.
The high voltages of modern ignition systems could cause an arc, known as flash-over, from the terminal of the plug to the metal shell of the plug. Can your ignition system handle the increased load? Good question.Ĭorrugations: Ever wonder why those ribs are on a spark plug? They serve to increase the di-electric strength of the spark plug. This is due to the fact that higher cylinder pressures make it harder for the plug to fire, therby increasing voltage requirments (this is why 2.5L NA is 0.044" gap and the 2.5L turbo is 0.030" gap). With a turbo charged motor, the gap is usually smaller. The bigger gap requires MORE voltage to spark, puting a much higher strain on your ignition system. The bigger the gap, the better combustion. Gap: Gap has a lot to do with igniteability. We typically only care about the temperature of insulator, as that is what gets hot enough to pre-ignite, and consequently, that's what gets measured. Heat Range: Heat range deals ONLY with the temperature of the insulator of the plug (the white part). Platinum or iridium can be used as a thin pad which is laser welded on the ground electrode (the "J" strap), this serves to increase the life of the plug. It's not a huge gain, but cylinder pressures are measurably higher. This increases ignitability, therefore increasing HP. These finer electrodes do not quench the flame core as much as a conventional style plug. The use of Platinum and Iridium, which are stronger, allow for much finer CENTER electrodes (the ground electrode is still Nickel). Copper can be used in the core all plugs.Īll ground electrodes are made of nickel. Materials: The three main types of spark plug materials are nickel alloy, iridium, and platinum. What's some good background spark plug information? Platinum or iridium can last, depending on manufacturer specifications, up to seven years. Conventional spark plugs generally last one year. Which type should I use? That depends on how often you are interested in changing the spark plugs. conventional nickel alloy (commonly referred to as "copper") What types are there? There are really three main types:Ī. Beru (specifically the Silverstones found here) They are listed for advanced users or those with interest.ī. Who are the specialty spark plug manufacturers? These manufacturers make specialty plugs that have unique compositions or designs that claim increases over traditional plugs. Alternately, you can visit an auto parts store or online retailer for recommendations on suitable spark plugs designed for your vehicle.
Are autolite spark plugs pre gapped manual#
What type of spark plugs should I run in my car? Refer to your owners manual for recommendations.
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