Jetjr, "Many of the current problems have developed with newer hydraulic lifters implemented and points to pre ignition to me.
Jabiru will still sell you a zero time solid lifter type now so will Camit, trouble is the LSA rules prevent it in 24 aircraft"
The hydraulic lifters are a bit suspect, I have seen dings in the tops of pistons from what I can only suspect to be "pump up" or incorrect preload on the lifter.
I was told by camit and I quote " yeah the hydraulic lifter engines haven't been very good".
Having said that the roller cam engine now in my J230 seems to be going well, but its early days yet.