I remembered there used to be such an animal.
Rings were not as accurately made way back in the dark ages.
Occasionally when checking ring gap one may be too wide & a single oversize standard ring [the ring cross-section was exactly the same] would be selected so one could get or establish the correct ring gap in the unworn portion of the bore.
Rings could be bought singly, not necessarily in kits.
Could have fooled me? That's precisely what has been going on, when trying unsuccessfully to rubbish other folks constructive input.Luc wrote:Am not saying that re-ring a worn cylinder can't be done right...so the mentor set you straight?
This 0.002" [comes from nowhere] & 0.005" taper stuff is a crock....0.005" out of true in TM 10 1513 refers to ovality not taper. Stating & restating stuff over & over that doesn't exist or is misinterpreted from TM's & publications helps absolutely no-one
All this stuff about service rings etc. is also a crock & no reason not to deglaze & re-ring a slightly worn engine to get superb performance. It is definitely not a reason the engine being talked about pumped oil....something was assembled incorrectly or wrong parts used end of story.John wrote:1. The pistons are 0.060" O/S so what size rings were fitted & what was the ring gap @ the bottom of the bore?
2. What was the taper & ovality of these bores?
3. Were the right [type] rings put in the correct grooves & were the DOT or TOP marks UP I don't think so! That is why the rings in both grooves show the rapid top wear from tilting the wrong way. This will pump oil see in the Mopar article.
4. The bores don't look like they were deglazed properly. If this engine was bored & final honed, it was not done well or properly.
Rings....soft & hard.
Hard are usually used in new engines & full rebores, They have chrome or other metallic faces & usually have ribbing to hold oil & wear quickly creating a good seal.
Soft are what some are referring to as service rings are more porous [cast iron face] to help wear in quickly & conform to the shape of the worn cylinder.
No one said all rings are equal & frankly using genuine NOS Willys parts is definitely not necessary.
They will not get as good a result as using more modern designs. Aftermarket's like Perfect Circle [including 3 piece oil control rings] are a real good bet.
As far as piston slap goes even with wear these low compression long stroke, long skirt piston, slow revving engines are not any worry, unlike new high compression, short stroke, high revving engines are, where piston pins are offset to counter this potential issue.