What is the cause of so-called piston tippers?????

Hello friends, there would be a question for you. You can now read at VW especially with the 1.4l gasoline engines, no matter if now with or without charging a lot of these piston tippers. But now I have at MT-Talk in the engine forum of VW-Motors gelsen that it hits also Audi. And there seems to be especially the 3 and 4 l engines….that I mean the displacement now. I would like to know why it comes to the piston tipper with these engines. Is this now because of the quality of these engines, that is to say, was saved on the material. There are all the full aluminium engines. But with other manufacturers the Alu engines produce this phenomenon does not seem to occur so often. Or are there distortion faults??? If one of you can say anything about this, I would be happy if he writes his opinion here. Thank you for your answers.