This SAE Standard specifies the minimum performance recommendation for spark plugs intended for use in various internal combustion engines including Automotive, Marine, Motorcycle and Utility engine applications. This standard is not intended to supply information for spark plugs used in aircraft applications of any type.
This standard will be an updated version of SAEJ548/1. It is intended to specify the design requirements and dimensions for spark plugs and their cylinder head mounting. This standard will cover automotive, light duty non-automotive and small engine spark plugs. It does not include aircraft and large industrial engine type spark plugs..
This SAE Recommended Practice specifies the design and/or evaluation with the specific equipment, conditions, and methods for distributorless battery ignition systems intended for use in various internal combustion engines including automotive, marine, motorcycle, and utility engine applications. The test procedures listed in this document are limited to measurements performed on a test bench only and do not include measurements made directly on engines or vehicles. This standard is not intended to supply information for battery ignition systems used in aircraft applications of any type.
This SAE Recommended Practice is intended to provide any technical person or group interested in ignition system design and/or evaluation with the specific equipment, conditions, and methods which will produce test results definitive and reproducible for his own work and yet sufficiently standardized to be acceptable to other groups working on battery ignition systems for automotive engines.
This SAE Standard applies only to spark plugs used for ground vehicles and stationary engines. This document is intended to serve as a guide to dimensions common to the majority of current production spark plugs and future applications. It is not the intent of this document to prohibit the manufacture of spark plugs having dimensions differing from those presented. Many applications exist which require specialized or nonstandard spark plugs. It is recommended that this document be used in spark plug design and engine applications wherever possible. Whenever design situations arise that prevent the use of one of these standard spark plugs, a spark plug manufacturer should be contacted for guidance. Figures 1 to 13 and Tables 1A to 6 show typical configurations of unshielded and shielded spark plug designs, their dimensional characteristics, installation, threaded hole, and spark plug thread sizes.