Hi Stone I am sorry for the long reply,
I have forgotten about this for a while
I got one 46FX and I did replace the liner and piston from asp, which I believe is chrome,
I havent fly the engine yet, right now preparing for an upcoming regional race here,
we have two kind of race here, one is a F3R indonesian rules for the main event (baby steps to the real F3R in near future)
the other one is F3R entry level rules.
in 2017 I won the entry level rules, and came second with the main, this december I will representing our city for the regional race.
i am not fast, but I am the only who can build the pylon racer here in town, so I have a some planes ready.
Now the props is not limited, however everyone else have been using APC 9x7.5 and a guy claimed he used 9x8 with fresh engine.
I tried the pylon race prop 8,75x8 or 8.25 I believe, it didn't go as fast, most likely wrong engine for the prop.
I haven't got a change to try bigger pitch yet as I must purchase it from Singapore.
I will have a look at the super tigre too.
THankss