Piston ring scuffing

[Dave Mann]

I finally stripped the engine removed from the car because of high oil consumption both leaking and burning, the leak was from the paper joint at the front right hand corner where the joint had become hard and a small piece had disappeared. The burning was as a result of extreme wear of the piston ring grooves and piston rings the corners of which were as sharp as razor blades a sure indication of ring scuffing. I've only seen one other example of ring scuffing on two 7000 BHP engines on a Royal Navy ship. The question is why, we know why the ship suffered from ring scuffing but I've never come across it on a Seven engine, could it be from running on E10 petrol which this car has run on since E10 became available?

[Alan]

I remember discussions about ring wear when E10 first appeared. I’ve not seen or heard anything recently.