E-MAG Auto Spark Plug Adapters Individual
Individual auto plug adapters for use with E-MAG electronic ignition systems. These single-unit adapters convert the 18mm aircraft cylinder thread to a 14mm automotive plug bore. Select the correct reach to match your cylinder: Short Reach (~1/2" thread depth), Long Reach (~3/4" thread depth), or Extra Long Reach for recessed-bore applications.
Adapters available:
To identify your cylinder thread depth:
Installation Note: Always install the spark plug into the adapter first (finger-tight and fully seated), then install the combined assembly into the engine. Torque to 18 ft/lb through the spark plug only, do NOT torque the adapter directly. Use anti-seize sparingly on the engine-side threads only.
| Adapter Part Number | Individual vs Kit | Reach | Engine | Copper Gasket |
|---|---|---|---|---|
Individual |
Short |
Yes |
||
Individual |
Short |
No |
||
Individual |
Long |
Yes |
||
Individual |
Long |
No |
||
Individual |
Extra Long |
Yes |
||
Individual |
Extra Long |
No |
||
Set of 4 |
Short |
4-Cylinder |
Yes |
|
Set of 6 |
Short |
6-Cylinder |
Yes |
|
Set of 4 |
Long |
4-Cylinder |
Yes |
|
Set of 6 |
Long |
6-Cylinder |
Yes |
|
Set of 6 |
Extra Long |
6-Cylinder |
Yes |
Note: LRX (Extra Long Reach) adapters feature an extended hex head to facilitate installation and removal in Continental 550-series and similar engines where the plug seat area is recessed.
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