What sort of breather system has the motor got?
(edit) just read the post about open breathers and fumes coming out the breathers.
It needs rings.

No Doc it wasn't .....I can assure you or anyone of that

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what make and type of pistons did you fit. hepolites have a slot in the piston to lubricate the cylinder wall. this has to be on the thrust side of the piston. if it is the other way around then you get excess oil on cylinder wall.
the only other thing is that the thin scraper rings on the oil rings have jambed back into the expander ring

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have you overheated the engine,and possibly taken the spring tension out of the rings???

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From memory (i could be mistaken) they are Hyprtech flat tops with hastings cast rings.

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I have found with the hypertec pistons there is a difference between the std dish and the flat tops in the width of the oil ring groove.
When I have used the flat tops I use the hastings chrome ring set. the oil ring is a 4 piece type. the 3piece ones the scraper is a little thiner and when you assemble them onto the piston they have a little too much side clearance. I found this out when I fitted some and when I was pressing the rings and turning them to check one of the scrapers popped over the lip on the center expander.

When I measured the two types of pistons there was just over .020" difference with the ring groove. The dished ones take the 3 ring oil set and the flat tops take the chrome 4 ring oil set set.

It is strange that the eng did over 2000k's then started burning oil. I think that the oil ring scraper may have slid over the expander ring.
It's a bit of a trap with the cross reference No's that hastings have for their ring sets as the book says that they are inter-changable.
In one of their books they give the ring set No for the cast type rings for a small bore and also list them for a 1275 morris 1100 S eng. I would like to see them fit them

I was lucky as the bloke that gets me my parts is an ex BMC mechanic and can just about rattle off every part no and changes for the after market stuff around today

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Research is the difference between speculation and investment. Anyone who copys some one else will always be second
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