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Federal-Mogul has announced the availability of its two-piece oil-ring design for direct-injection gasoline engines, previously developed for demanding diesel applications.

The patented LKZ oil-control ring reduces oil consumption by up to 50 per cent and friction by up to 15 per cent, compared with the best conventional two-piece oil rings, according to the company.

The additional benefits of this improved engine performance are fuel economy, CO2 reduction and longer oil life.

Widely used in light- and heavy-duty diesel applications, LKZ rings are ideal for the highly loaded conditions seen in gasoline engines – particularly more sophisticated units with direct injection.

Federal-Mogul’s LKZ ring combines a stepped surface and taper on its contacting edge, which provides a well-defined pressure to the cylinder wall on the downstroke and a significantly lesser effect on the upstroke.

The downstroke pressure more effectively returns the oil that lubricates the cylinder to the oil pan – as opposed to allowing oil to enter the combustion chamber where it may create carbon on the spark plug or on the cylinder head and increase oil consumption.

‘The LKZ ring is so effective in pulling oil away from the combustion chamber and in reducing oil consumption that we are able to improve ring tension and reduce friction,’ said Johannes Esser, Federal-Mogul’s director of engineering, Rings and Liners.

‘The LKZ ring, unlike conventional oil rings, also provides consistent low oil consumption over the life of the engine by reducing carbon build-up on critical parts of the piston, such as just above the compression ring,’ Esser continued.

Depending upon the level of wear resistance required by engine manufacturers, Federal-Mogul can apply a variety of surface treatments to piston rings, such as chrome, CKS (chrome ceramic coating) and GDC (Goetze diamond coating), which protect the ring periphery from scuffing – minimising wear and enabling the oil ring to function properly over the life of the engine.

The LKZ ring also can be coated with Federal-Mogul’s DLC (diamond-like carbon) coating to further reduce engine friction.


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