40
Coilpack numbering
For systems controlling ignition, coilpacks will almost always be supplied with the kit and numbered for
your particular engine. Most 4 cylinder engines use default numbering scheme cast into the coilpack
except for VW air cooled or inline 4 cylinder engines, which must be renumbered. Be careful if you
change to a different engine or you buy a used system and have a different engine than the system was
sold for, because coils may need to be renumbered.
Lycoming 6cyl be aware that Top mount and Mag mount coilpacks are numbered differently. Top Mount
Coilpacks may be numbered and wired like the Mag mount.
These are fired in a waste spark configuration, which means two plugs are fired at the same time. One
plug is fired on compression, the other on exhaust when no mixture is present. For convenience of
connecting plug wires you can swap sides with numbering too if this helps with routing plug wires, for
example on the inline 4cyl configuration you could run cyl #1 plug wire off the right side (#4 in diagram
below), and run the #4 cyl plug wire off the left side (#1 in diagram) because these are the same coil so
both fire simultaneously, which is called the waste spark system. So you could swap the numbers side to
side in all the coils in the diagram below.
Spark Plug Wires, Boots and Terminals
We can supply MSD 8.5mm Superconductor wires, MSD plug/coil boots and MSD terminals to properly
fit your coil packs. If you don’t use these components, be sure to always use quality EMI/ Magnetic
Suppression wires. Never use solid core, non-suppression wires with SDS. You must always use
resistor type plugs as well. Keep the wires away from exhaust pipes or anything which could chaff
through the insulation. Be sure to properly crimp the terminals as shown here:
https://www.youtube.com/watch?v=8kQDSlpKrCw and see the file at the end of this manual. Make your
longest wire first and add 1 inch in case the insulation pulls away some of the conductor with it when
stripped. Lubricate the terminal and ID of boots with glycerin based hand sanitizer before trying to slide
boot over terminal. We recommend you purchase MSD crimping tool PN 35051 or if you have a similar
crimper, you can buy just the jaw set PN 2048. This does an excellent job.
If you are running twin coil packs, you should run a plug wire from each coil pack to each plug on a
cylinder. This provides maximum redundancy in the event that one coil pack fails.
To Next Page
Loading...
