Spark Plug Cables

Something I have been pretty picky about is the routing/mounting of the ignition system. This process started a probably a year ago at this point but started finally coming together in December when I was finally able to securely fasten the coil packs in a position that was both secure and cleared the cowl. 

I have seen a lot of planes (or at least photos of planes) with people bundling the plug wires on their electronic ignitions. While I am not sure how important it still is in modern plug wires to separate cables by at least 1/4" I made the decision early on that I wanted to isolate individual plug wires. 


 

I did end up ordering a lot of spare hardware from Summit and Amazon that I ended up not using as I was trying different wire layouts. As a base, FlyEFII sends 2x Taylor 8mm Spiro-Pro cable kits along with their System 32. I stuck with those cables as they seemed to be pretty nice quality. I swapped out the coil pack ends from that kit with Taylor Cable 46051 90 degree low profile HEI boots. I ended up doing that for two reasons. First, FlyEFII sends enough hardware to do the 12 plug cables. I always like to have extras prior to starting so I was going to be ordering another set of plug boots anyways. Secondly, I centered the coil pack bracket on the engine mount cross bar. In doing this, the coil packs are a bit close to the baffle. While the standard locking boots still fit in this space, the low profiles make it just a little bit nicer to service the forward facing boots.

In order to secure the cables I used 2 packs of 42700 as well as 2 packs of 42502 cable separators. The 42502 have standoffs included with them.

  

Fly EFII ignition mount

I went with the FlyEFII System32 ignition (dual). They have a nice bracket for the coil pack, but this makes a pretty hefty assembly that needs to be mounted. There are various things people have done to mount this pack and most of them include standard adel clamps. I wanted something a little heavier duty, because this is a pretty heavy assembly. I ended up finding a light bar mounting bracket off of House Tuning that worked perfectly. This is the standard 7/8 tube rubber isolated light mount.

The coil pack holes accept AN-4s but the light bar mounts are 3/8s (or maybe even 5/16s). I placed a mcmaster order for some bushings (under bearings at mcmaster) to take the 3/8s holes and adapt them. The bushings didn't fit, so I reamed out the holes.

And then shortened up the bushings a bit.

This allowed me to install the front two mount points of the coil pack right behind the aft baffle on the main cross bar.

This looks like it is going to be perfect for the plug wire spacing (at least I hope so because anything other than this is going to be kind of a pain.

The last thing to do is make one hard mount point for the aft of the coil pack going down to the angled bar. I will do that another day. I am either going to come down the the angle bar, or I am going to install one of the bar mounts facing aft and flush mount a screw through the coil pack plate. For now though, it is pretty dang solid.