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Re: Deves Piston Rings - Swedecar Opionion Needed
Posted by Dean [Email] (more from Dean) on Tue, 26 Apr 2005 07:45:18
In Reply to: Deves Piston Rings - Swedecar Opionion Needed, Steve H., Tue, 26 Apr 2005 05:48:44
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There used to be an old rule of thumb about putting new rings on old pistons. The old rings were wearing the bottom of the lands and as the ring wore against the cylinder walls, the ring moved out. This combination can create a non flat land for the new rings which was thought to contribute to new rings breaking. Some replacement rings have a relief on the back corner to reduce this issue. Maybe some of the folks with Saab engine experience can comment. Perhaps with modern oils, this is less of an issue.
Sometimes a compression top ring is a different material.
When the new rings come out, you can see if the old rings are stuck with sludge that has coked to a hard material. In some cases the rings only come out in pieces as the coked oil is so hard. If you were not buring oil, perhaps things are not so bad.
You have new oil control rings as well?
New rings may come with some oil consumption until they are seated ir have worn in.
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