In the early 1900s, small planes flew with single ignition systems powered by adapted automobile engines using Champion-brand automotive spark plugs. By the 1920s, the company had developed innovative spark plugs designed specifically for the aviation industry.
Champion Aerospace designs and manufactures Champion-brand piston-engine ignition components for both OEM and aftermarket for general aviation aircraft applications. Every spark plug manufactured has built-in design advantages that assure longer life and greater reliability.
A typical spark plug number with symbol explanation
* Shielded barrel thread size. Check barrel size - 5/8x24 or 3/4x20 threads before ordering and select proper plug number, See page 236 for Sparkplug Application Table.
** The "Iridium S" sparkplugs replace the Platinum and "W" Iridium types. Increased bore diameter improves scavenging action. Greater clearance volume can accept more combustion deposits. Single Iridium electrode offers greater resistance to lead attack. Easy to clean Easy to gap
Spark plugs are shipped in factory sealed plastic cases. Opened spark plug cases make the spark plugs non-returnable. Please do not open any spark plug until you are sure you have received the correct spark plugs for your application.
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They do come with a new copper gasket, but no specific part number.
The 38 and 40 refer to the heat rating position of the plug. Champion does not provide specific temperatures, only that the higher number has a hotter heat rating and the lower the number the colder the rating. Which plug to use should be determined by the aircraft mechanic depending on conditions of operation and application.
The spark plugs are labeled with a gap of .016-.021. It is recommended to check the gap before installation to be sure it is set where you need it to be.