The fact it only happens when going around right hand corners sounds more like oil starvation. I'd expect main bearing/big end wear to show up on the straight and left hand corners too
Abarth seems difficult to view dip stick level so are you SURE you're not simply low on oil because that would usually be the reason
I agree, but he seemed very confident that the oil level was fine. I used to get it on left corners with my Uno when a bit low on oil. It is basically a pressure drop though, and is not a very good sign.