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Autolite engineers have developed plugs in many heat ranges to suit all engine applications. They range from COLD through MEDIUM; and HOT to EXTREMELY HOT. Rules for selecting the correct plug are to follow manufacturer’s specifications. COLD MEDIUM HOT
In order to gather this information you must know the thread diameter, length and seat type required by your cylinder head. Do not use a removed spark plug as a guide for determining proper shell dimensions. Failure to get accurate information can result in decreased performance and damaged engines.
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A spark plug is a device installed at the top of an engine cylinder that generates sparks at the tip of its electrode when a high voltage is applied across its terminal ends, thus igniting the compressed air-fuel mixture in the cylinder.
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2019 NGK spark plug catalog featuring a wide range of products for automotive applications.
High-tech spark plugs provide low-emission combustion and optimum fuel effi-ciency – without misfiring, which can cause unburnt fuel to get into the catalytic converter, and destroying it. A modern spark plug must meet the following requirements: BERU spark plugs are designed and manufactured using high-
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The AC Delco Spark Plug Decoder Table. Prefix and suffix letters are used to identify a specific type plus the numbers relate to thread size and heat range. For example, the R45TS spark plug shown is: R - Resistor. 4 - 14 mm Thread. 5 - Heat Range (range 1-5 start with a 3)
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Our spark plug cross-reference chart is an easy-to-use and comprehensive guide that allows you to quickly find the spark plug you need. Unlike other charts, our chart includes up-to-date information from the leading spark plug manufacturers.