if the second ring is installed upside down everything is fine for the first half hour
then you get exactly the problem you see...
don't ask......
ok i'll say anyway
in the early - mid 2000s Sealed power rings for 318s and similar came with comprehensive instructions. 2 full sides of tiny print and pictures, on a fold of A4, or sometimes very very tiny print-out of the same info on A5 paper
basic rings come either with or without dots to show top. It says if they don't have dots you are dependent on a visual cross section image to ID your ring and its orientation. the images show various styles of taper to inner and outer side of ring. some perpendicular, some not, some with corner cut to make a chamfer, some with both corners cut, some with opposing corners across the diagonal cut. but they are not particularly explicit about which is the inner and outer side of the ring in the image.
their basic rings come with dot for top ring and nothing on the second ring
however the instructions cover every ring, for every thing, they have ever made, Tanks, lawn mowers, race cars etc, every type of piston ring you can imagine.
All of the "special" stuff is discussed first, and yes you will see cross section images about 3/4 of the way through... which could be just what you need to identify type and orientation of your second ring... but its not.
You have worked you way through, dismissing numerous ring styles as "not my ring" until you get to this point...... and yes ...... they do appear to be Your rings.......WRONG. Your rings do not have the taper shown...they have similar but not the same.....
For a basic set of moly rings for a 318 340 360 225 265 whatever...
the detail you need is in the last sentence on the back of the sheet after all of the pictures, after all of the rings, you will never ever use.
its in the
"FOR EVERYTHING ELSE" section (two lines of text)
anything that isn't what we have discussed so far, do x for the top and y for the second ring...
if the installers head was turned by the images then i can understand how a second ring may be upside down.
basically the more rings you fit the less likely you are to read the instructions and get caught out.... even if they cost double there ain't nothing special about these rings... they are just moly faced standard rings....
i only discovered what i had done by buying rings from another unrelated company....their instructions were minimal, but to the point, and specific to what was in the box, they had dots on both top and second ring. A comparison of what came out with what needed to go in, with a magnifying glass illustrated my failure
its a long time ago.......but....I'm still embarrassed
motor exhibits good compression
everyone thinks its valve seals or a gasket problem
an hours use fouls the plugs
the smoke out the back is like something james bond would employ
performance, initially great, degrades quickly
you find oil in places where oil should not be.
because you second ring is acting like a dam or boom to pull oil up the bore....not what you need
Dave