Engine-Parts_Spark-Plugs_Champion
All Champion Aviation Spark Plugs are identified by type designations selected by virtue of the plug design as applied to the following Spark Plug Number and Symbol Chart. The symbol is composed of a rating position number together with prefix and suffix numbers to indicate major plug design characteristics.
R -- Push-wire--90° to Center
1. Resistor
None--No Resistor
R--Mil-Spec. Resistor-Erosion protection
2. Barrel Style
None -- Unshielded
E -- Shielded 5/8"-24 Thread
H -- Shielded 3/4"-20 Thread (All Weather Plug)
3. Mounting Thread -- Reach -- Hex Size
B-18mm 13/16" / 2.06cm 7/8" / 2.22cm
M--18mm 1/2"/1.27cm 7/8"/2.22cm
L-14mm 1/2"/1.27cm 13/16/2.06cm
U18mm 1-1/8"/2.85cm 13/16/2.06cm
J -- 14mm 3/8"/0.95cm 13/16/2.06cm
4. Heat Rating Position
Low number--cold
High number--hot
5. Electrode Design
None-Conventional single
E -- Two prong massive
N -- 4 prong massive
W -- Fine wire (Iridium)
B --2 prong massive, Tangent to Center
P--Fine wire (Platinum)
Download Champion Aerospace Aviation Catalog PDF
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