Standard Preignition Rating of Spark Plugs 1999-11-15 HISTORICAL J549_199911 This SAE Recommended Practice describes the equipment and procedures used in obtaining preignition ratings of spark plugs.
Standard Preignition Rating of Spark Plugs 2013-03-11 HISTORICAL J549_201303 This SAE Recommended Practice describes the equipment and procedures used in obtaining preignition ratings of spark plugs.
Standard PREIGNITION RATING OF SPARK PLUGS 1990-06-01 HISTORICAL J549_199006 This SAE Recommended Practice describes the equipment and procedures used in obtaining preignition ratings of spark plugs.
Standard Preignition Rating of Spark Plugs 2020-06-15 CURRENT J549_202006 This SAE Recommended Practice describes the equipment and procedures used in obtaining preignition ratings of spark plugs.