Originally Posted by
Sport_Pilot
Sorry but aluminum expands faster than brass and ABC liners keep or nearly keep their clearance as they expand. Iron sleeves and pistons get looser as they expand not ABC.
You are correct that aluminum expands faster than brass. That is why high silicon aluminum is used for pistons, often over 22%. It provides better wear resistance than steel too because of that, and the coefficient of expansion is lowered from standard aluminum alloys. I am not sure what grade of brass or bronze is used on liners.