I have recently experienced the OS .46AX. It is by far the smoothest running, best transitioning, lowest idling, most powerful .46 I have personally flown. Its in a 65" GP cessna 182 and it flat screams. What a nice engine. I think you cant really go wrong with OS as long as it isnt an "LA"series engine. Even the LAs are ok, they just dont last very long..... I have seen a lot of the TT engines, they are tricky to tune but once you get it right they run like a top.


Mike