September 2, 2005

One of the challenges I decided to take on today was the FADEC engine harness. I was having a spot of trouble trying to figure out how this thing was routed. It seemed to be a bit of a stretch between all the sensors. After much trial and error, I think I finally may have something!

I started by putting everything that had no leeway into position. One of those items was the fuel pressure sensor wires. There’s absolutely no slack in these at all. The fuel sensors are so long. I hope it will clear the cowling. I might have to clock the fuel distribution block around so the senders miss.

The other difficult ones were the manifold pressure sensors. Not enough cable here, and the intake runners are a bit of a squeeze.

After sorting this, I ended up with this mess at the back of the engine. It’s no good, as the manifold pressure wires are too tight against the sump in multiple places, and the wires up to the top of the engine aren’t going to work with baffles.

This won’t do.

Or this….

So, I tried to move stuff around a bit. My main aim here is to give the wires some slack. Here’s a shot of the rear on the engine with a routing that seems like it’ll work. I’ll take some more pics of the other areas as I tidy it all up some.

I messed about with trying to find a place for the hefty FADEC ECU’s. They’re humungous! Here’s a likely place.

I think I need to hang the engine again… I put the info for this on the Firewall Forward page.

So, now we have our engine mounted, and some idea of where the cable runs are, we might be able to figure out the ECU locations a little more precisely. Remember when you do this, you need to allow room to remove the High Tension leads. It looks like my oil cooler will be going on the baffles. There’s not much room left back here. Hmmm… These things will make great mass dampers for the firewall! I’m going to have to put some structure on the firewall to support all this.