Federal-Mogul has developed the latest sealing technology with Goetze’s CarboGlide piston ring coating.
Manufacturers are turning to piston ring coatings to enhance engine efficiency, as strives towards engine performance increase and emissions regulations become increasingly stringent.
Goetze, used as OE-standard by the world’s major vehicle manufacturers, now brings its innovative technology to the aftermarket. Goetze CarboGlide reduces piston ring friction by up to 20%.
Piston Ring Friction
Reducing friction from piston rings results in higher efficiency, lower fuel consumption and reduced emissions. It is a difficult balance to reduce friction, to maintain heat transfer from piston to cylinder bore and to maintain a pressure-tight seal. With metal-to-metal contact, wear will always occur. Coatings are therefore essential in protecting the materials by reducing wear-rate.
All engines can benefit but the unique, multi-layer microstructure of the coating is optimised for highly-rated petrol engines. The coating cuts friction by up to 20% and provides superior scuffing and wear resistance. Low-friction piston rings improve engine efficiency, without adversely affecting oil consumption, blowby, wear, or cost.
Goetze’s new piston ring coating, CarboGlide, supports vehicle manufacturers’ efforts to make gasoline engines more fuel-efficient.
Due to its high chemical and physical stability CarboGlide protects the cylinder bore surface from scuffing and scoring, especially under the most critical lubrication conditions.
The high wear resistance makes CarboGlide suitable for the latest generation of high-output petrol engines with turbocharging or direct injection, while the low friction improves fuel economy by up to 1.5%.
To minimise friction wear within the piston, the specially formulated coating is resistant to high temperatures, high pressures and very high forces. Due to new engine designs, CarboGlide lasts longer than ever before despite working with less lubrication.
The coating’s superior properties are achieved by a multi-layer microstructure and a special coating composition that contains carbon, deposited in diamond-like form, as well as hydrogen and tungsten. The unique structure can be produced in coating thickness up to 10 microns, more than three times that of the industry’s latest state-of-the-art DLC (diamond-like carbon) coatings. CarboGlide is Goetze’s third and most advanced generation of DLC coated ring technology.
A specialised advanced process based on the combination of Physical Vapour Deposition and Plasma-Assisted Chemical Vapour Deposition, specifically developed for piston ring application, is used in applying CarboGlide. The coating’s multi-layer architecture, together with Goetze’s surface machining and finishing expertise, ensure the integrity of the coating structure, optimal adhesion of the coating and high coating stability on both steel and cast iron rings.
Extensive testing, on both cast iron and high-silicon aluminium cylinder bores, showed that CarboGlide-coated rings minimise friction and scuffing over the full life of an engine, even in the challenging environment typical of GDI turbo engines.