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850 pistons
Posted: Fri Nov 01, 2024 7:28 pm
by whistler
Back in the 60's when I was rebuilding a 997 engine (I think) I was advised to leave off the second oil ring, the one below the gudgeon pin on a 5 ring piston. Have I remembered correctly or was it in a dream?
Re: 850 pistons
Posted: Sat Nov 02, 2024 6:18 pm
by Spider
It depends on the ring design and bore (hone) finish, but yes, you usually can leave a ring off.
Re: 850 pistons
Posted: Sat Nov 02, 2024 7:01 pm
by whistler
Spider wrote: ↑Sat Nov 02, 2024 6:18 pm
It depends on the ring design and bore (hone) finish, but yes, you usually can leave a ring off.
Both oil rings are 1 piece ones.
Re: 850 pistons
Posted: Sun Nov 03, 2024 1:47 am
by Spider
whistler wrote: ↑Sat Nov 02, 2024 7:01 pm
Spider wrote: ↑Sat Nov 02, 2024 6:18 pm
It depends on the ring design and bore (hone) finish, but yes, you usually can leave a ring off.
Both oil rings are 1 piece ones.
Ah,,, OK,,, they aren't brilliant at all. I'd run a full set of rings with them. If you wanted to change to a set that had the 3 or 4 piece oil control rings, then sure, leave one off.