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Plug Wires – Cylinder Assignments
As with any wasted-spark ignition, E-MAGs fire spark plugs in pairs. Cylinders 1&2, 3&4, 5&6 are
pairs
with plug leads connected to both ends of a double ended coil “Bank”. See Appendix 5 for
instructions on fabricating individual trim-to-fit plug wires.
.
Note 1: The Pull-Thru test [highly recommended] is the best way to verify the installation follows
correct bank (cylinder pair) firing order. This test uses encoder data at the lowest possible
resolution, i.e., pull-thru firing positions cannot be used to check tracking accuracy. During
normal operation, dynamic quadrature counters are used to increase tracking resolution and
accuracy.
Note 2: Ignition Bank firing sequence is A-B-C regardless of the direction of the engine/ignition drive
interface.
Note 3: * CW and CCW engine rotation reference
– as viewed from back of engine looking to prop
on the far side.
Note 4: If using strap (Adel) clamps to secure plug leads, make sure the clamps are properly sized.
Reusing clamps for smaller size (previous) wire may be too tight and crush/compromise the internal
silicone insulation layer of our 8mm wire.
Auto Plugs and Adapters
Aircraft engines are typically tapped for 18mm thread spark plugs. To use 14mm automotive style
plugs, we sell Auto Plug Adapters. There are numerous auto spark plug styles and temperature
ranges available through various outlets. E-MAG has NOT studied the relative durability or
performance of different plugs. Customers need to monitor plug condition and evaluate and adjust
as necessary. The plugs listed in Appendix A and have a history of good service. Set plug gaps at
0.030” to 0.035”.
Bank A
Bank B
Bank C
Continental
™ engines:
1) Always - route Bank A to cylinders 1&2.
2) Most installations will route Bank B to 5&6, Bank C to 3&4
as shown.
3)
In the event of a Left (CCW*) rotating engine
(i.e. for a twin)
you may need to swap Bank B and C assignments
Always verify proper firing with the Pull-Thru test.
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3
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