With the new IO-390-EXP119, Van's changed the diameter of the SCAT hose leading to the oil cooler from 4" to 5". Since I can run 210 degrees on a hot day, I thought it might be worthwhile to swap out to that new diameter tube. In October of last year, I bought the minimal number of parts to make the swap and reused everything I could. And I finally got to installing it.
It was fairly trivial to remove the back right corner pieces of the baffle.
First the old pieces to be reused had to come off...
Then the new CB-00015A Right Aft Baffle could be riveted together.
Then everything gets hooked back up (I cut the excess off of the hose clamps). I did have to grind away a small corner of the Ignition Wire Harness Seal since it would otherwise overlap a rivet along the CB-00037 5" Flanged Duct.
And here sits that big 5" SCAT.
So what differences have I noticed?
- I've noticed that the oil temp comes down significantly quicker when I nose over after a climb.
- I can do a protracted full power climb with 110 IAS in the summer and the oil temp doesn't exceed 210, whereas in the past it would exceed that and I would need to arrest my climb.
- CHTs don't seem to be adversely affected (e.g., perhaps the air going into the SCAT must be coming from somewhere and either doesn't affect the CHTs or the reduced oil temp helps any increase in CHTs from reduced airflow).
- Bottom line: In my case, this modification had a material impact on my oil temp, which was what I was hoping for.
