SAE Standards Works
Ignition Standards Committee
J549 - Preignition Rating of Spark Plugs
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Preignition Rating of Spark Plugs
This SAE Recommended Practice describes the equipment and procedures used in obtaining preignition ratings of spark plugs. The spark plug preignition ratings obtained with the equipment and procedure specified herein are useful for comparative purposes and are not to be considered as absolute values since different numerical values may be obtained in different laboratories.