G80/18 Piston Rings Radial Width

[Joker_Bones]

Hepolite pistons 1963 extract.JPG

Hepolite piston rings G80-edit-20230704161208.jpg

Does anyone know the meaning of the headings 'Original Regular' and 'Replacement Regular'.
Why are there two different radial widths of the piston rings

[g80csp11]

I wonder if its the depth of the ring to help compensate for liner wear on a used engine . Im guessing the width is the same between both ring sets as wear on the groove under normal circumstances is minimal

Maybe the replacement set gets TAN load back to standard on a used bore (force required to close the ring to nominal gap) , helps control wear and oil consumption

is it possible to get a copy of the matchless / Ajs section of the second book . is it available online to download ? its not in the Helpote book i have !

[Joker_Bones]

I am working on a G80 engine, it came with a piston but no rings.
I bought a set of Wellworthy rings 0.116 radial width.
Talking to Steve at AMC he said to make sure I had the right rings as they came in two radial widths and fitting the wrong ones could damage the bore.
That's what set me off looking for information.
The first catalogue, which is from Christian's Archive, lists two different ring sets but not different individual rings.
The second catalogue extract was attached to a set of 0.116 rings on ebay. The vendor said they were the 'earlier' ones 'later ones being wider'.
All a bit puzzling to me.

[Joker_Bones]

I don't have the full sections, just what was attached to the ebay item I saw...

Hepolite piston rings G80.png

Hepolite piston rings 18.png

[g80csp11]

then id recommend talking to cox and turner , they will know the answer

[Joker_Bones]

Good suggestion...
I'll wait a while first and see if anyone else here has any information.