One piece oil ring

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fiatfan

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Bought these rings for my -73 850 a while back, didn´t open the box when I got it so now I have these one piece oil rings. Is this an absolute "no-no" to put in an engine with very slightly used pistons and fine bores? I don´t really like them but now it´s too late to return them and I guess noone else will buy them if I try to sell them.....
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Not sure what you mean? Your photo looks 1 expander and 1 oil control rail
IE 2 parts of a 3 piece oil control ring?
 
The one piece oil ring and expander are quite common now. (I have the same AE piston in stock bore size but different paperwork)
Are they any good, probably but are a keen fit come time to fit them to the cylinder.

I think JC had mentioned them in the past.
 
Not sure what you mean? Your photo looks 1 expander and 1 oil control rail
IE 2 parts of a 3 piece oil control ring?
Maybe bad pic, but it´s one thick ring that fills out the whole piston groove with an expander inside. Not the "normal" 3-piece with two thin rings and the expander in between. I´ve read some posts here and it seems that this type is not very popular.
 
There were some one-piece oil scrapers back in the day, but unless they changed the design, I would avoid them. Due to their larger ring-to-bore interface, the old ones contributed to friction and were less effective at displacing oil.
 
this type of oil rings work very well ? never experienced ring to bore interface and the fact that this contributed to friction and less effective at displacing oil ?

AE introduced these type of rings to combat oil consumption issues the ring material and expander are designed to apply only the required amount of bore pressure to
prevent passing oil , as they are genuine NOS AE rings i would have no issues fitting them to AE pistons
 
this type of oil rings work very well ? never experienced ring to bore interface and the fact that this contributed to friction and less effective at displacing oil ?

AE introduced these type of rings to combat oil consumption issues the ring material and expander are designed to apply only the required amount of bore pressure to
prevent passing oil , as they are genuine NOS AE rings i would have no issues fitting them to AE pistons

The AE's I bought were advertised as NOS, they are a little finicky to get into the bore due to the expander but there seemed to be no excessive friction turning the engine over (I lightly oil the bore anyway)
The rings were installed on the pistons out of the box.

I just realised FiatFan has rings only ? where mine were a standard piston set with rings, cast internally with AE (So not another reboxed JCC ?)

Current replacement Moto Guzzi cylinder kits (Gilardoni) out of Italy come with the same type oil ring and someone commented on the difficulty to fit them into the bore on a FB page I follow.

That I recall these pistons looked the same as the stock bore items removed but can not remember what the ring packs looked like, but will assume/presume with optimism being one piece they might be a little more stable at scraping oil compared to a three piece with waffle expander as per a JCC / Emgo.

Barcodes seemed odd all the same. (First used 2 October 1979 in the UK Google says)

piston.jpg
 
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This picture above is about all you can close the ring up which I guess is one reason they take some work to get into the bore (I do not like ring compressor's )

Having pulled the engine out of the frame to change the push rods and piston circlips on the AE pistons I decided to reduce the inner expander to a length that ended up at a 4.5 mm end gap with a seated pressure by hand.
Closing the gap gives what feels like a more suitable pressure as far as installed cylinder wall pressure, especially to what it would have been.
 
I worked on someone else's freshly rebuilt Trident, it burned oil with those rings. 3-pc. oil ring solved it. I wouldn't use them for that reason..
 
I worked on someone else's freshly rebuilt Trident, it burned oil with those rings. 3-pc. oil ring solved it. I wouldn't use them for that reason..
Ditto. My experience with these on both the Norton and T140 is the same, oil consumption and smoking. Will stick with the 3 piece from here on out
 
:rolleyes:

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Update, replace the new push rods, new circlips and new rings.
Trojan had one set left and oddly enough now stock is 0 available 14 sold (in standard Hastings bore size)
 
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Time Warp if you have cut the expander you have just ruined a perfectly good set of rings , prepare your self for another strip and re build to replace the rings

the expander spring is designed compresses on fitment and apply a specific bore pressure cutting the ring reduces this one your motor has been hot and cold a few times bore pressure will reduce and the white smoke will appear to many posts giving bad advice telling you to cut the rings to ease insertion

I guess AE Automotive OEM suppliers to Norton / Triumph / BSA got it wrong ? this type of ring construction is industry standard and still used OE for many applications decades after conception ?
Early production Triumph / BSA three cylinders were subject to dealer recall as they burnt oil using one piece rings AE upgraded to this type of ring to combat the issue
the three piece Hastings rings are hated by triple specialists as they smoke like pigs , but having said that Hastings work well on Commandos and Triumph twins
 
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