The original Reductions redrive motor mount bushings were due for a replacement. (they are shown in the bottom right corner of the photo)Easier said than solved as the bushings were custom units that could not be replaced. I opted to rework the metal hardpoints and use new isolator bushings from Barry Isolators. The units I selected had slightly different diameters but the same face to face measurements as the old ones which allowed the engine to sit in exactly the same position. I selected isolators that will support the load in all axis with a safety factor of 100%. The bushing are fail safe when you use the proper large diameter washers that Barry Isolators supplies. I used the 44001-13 isolators for this application.

I also had to enlarge the lightening holes on the top hard points to make room for the new fuel injectors and their electrical connectors. This took several file and test fit sessions to get a good fit with minimal metal removal.

Mar 2014 UPDATE: I have found that the 44001-13 isolators to be too soft in both the axial and radial loading conditions. After a few months the lower bushings which are under compression were squishing down way too much. My first flight this year was very interesting as the engine was moving to the right by a few degrees under load and hands off flight was not possible. Once power was reduced on final, the effects of this increased off set went away allowing a controlled final and landing.

I have ordered 4 new 22001-15 bushings from Black Diamond Industries. They have a 300# axial and 60# radial load capacity and the deflection VS load rating is 2.5 times better than the 44001-13.

I also ordered 4 22002-15 isolators which I may use for the bottom mounting points if the 22001-15 are still too squishy.