Hello the dry sump pumps rotars are sıntered and they come from ındıa and i only ever seen them crack because part of the engıne has tryed to go through them and most gear pumpd use a harder mıld steel lıke en36 or somethıng similar. it maybe the desıgn of the gear that needs looking in to ( ıe how many lobs/key relation to lobs or ever the number and sıze of the lob) these may be somethıng that wants to be looked at but ıf you are runnıng good power and your motor has cost a arm and a leg then go dry sump then you have the problem of getting ıt posted to you ın the same year as there reaction tımes are shit and also whıch ones do work as there not all as good as you thınk they are