Re: FDE 11 Piston me Off Home › Forum › Ask A Member › FDE 11 Piston me Off › Re: FDE 11 Piston me Off frankrUS Member - 1 Year (includes $3 online payment fee)Replies: 6715Topics: 51 May 22, 2018 at 10:00 pm #76585 They went to two-ring pistons a long time ago. No problem. Actually, pressure back rings came later on.