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Pistons

We offer the best product range of Goetze LP7 Piston Rings, Goetze MoThermal Piston Rings, Piston Pins, Elastoval II Ultra-lightweight Pistons and Aluminum Gasoline Pistons.

Goetze LP7 Piston Rings

  • Brand Name Goetze
  • Product Category Large Bore Engine

Goetze LP7 Piston Rings for 4-Stroke Large Bore Engines The LP7 ring material is characterized by a predominatly lamellar and uniformly distributed graphite structure in a pearlitic matrix and has good conformability due to a relatively low modulus of elasticity. Non heat-treated grey cast iron Main applications: compression rings High break resistance DIN 34 109 Minimum bending strength: 420 MPa Modulus of elasticity: 90 - 120 GPa Ring diameter range: ≤ 700 mm

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Goetze MoThermal Piston Rings

  • Brand Name Goetze
  • Product Category Large Bore Engine

Goetze MoThermal Piston Rings for 4-Stroke Large Bore Engines All-molybdenum spray coatings have low adhesion tendency due to its proneness to form hard (ceramic) oxides during spraying and its high melting temperature. Applications include diesel engines subject to increased risk of scuffing. Main applications: compression rings High scuff resistance, low adhesion tendency Coating material: Molybdenum Coating application process: Flame spraying Hardness of coating: Average 900 - 1200 HV 0.1 (permitted variation ±60 HV 0.1) Strength: minimum 30Nmm² In order to improve the wear resistance and tribological properties of the rings, different coatings have been used on running surfaces for many years. Galvanic coatings, thermal coatings and PVD coatings are used. Spray coatings on piston rings in the top groove are preferred to hard chromium plated rings above all when engines - chiefly diesel engines - are subject to increased risk of scuffing. Materials deposited by a spray process can better withstand this adhesive wear caused by direct metal-to-metal frictional contact, as in some cases they have a very high ceramic content. All-molybdenum has a low adhesion tendency due to its proneness to form hard (ceramic) oxides during spraying and its high melting temperature.

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Piston Pins

  • Product Category Pins
  • Markets Light Vehicle Heavy-Duty

Piston pins perform reliably under the loads and stresses of their environment and feature: Strength and rigidity Durability and a high fatigue threshold Light weight to keep inertia forces to a minimum Superior surface finish for good bearing properties within the piston assembly Cost-effective production Materials used in Federal-Mogul Powertrain piston pins include: AE308 Boron steel for medium- and heavy-duty diesel applications AE527 Chromium steel for cold-extruded gasoline pins AE530 1 percent Chromium steel for cold-extruded diesel pins Piston pin fit and clearance must be carefully optimized and controlled to avoid noise and excessive axial movement at one extreme, and scuffing at the other. Federal-Mogul manufactures pins by creating an extruded blank with a finished internal form rather than machining from solid bar. This process reduces waste and gives a high-quality, consistent and internal form. Piston pins are case-hardened, which involves carburizing, heat treatment and tempering to increase wear-resistance, strength and fatigue strength

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Elastoval II Ultra-lightweight Pistons

  • Product Category Pistons - Aluminum
  • Markets Light Vehicle

Avanced Elastoval® II gasoline piston technology is based on Deep undercrown pockets Inclined side panels Lightweight pin support design Thin walls 2.5 mm Optimized skirt area and flexibility F-M S2N high performance alloy Features and benefits include: 15% weight reduction compared with the previous generation gasoline pistons Allows specific power up to 100 kWL Optimized noise and friction performance Compatible with alfin ring carrier option for increased peak cylinder pressure and robustness against knocking

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Aluminum Gasoline Pistons

  • Product Category Pistons - Aluminum
  • Markets Light Vehicle

Federal-Mogul Powertrain’s aluminum gasoline pistons provide innovative solutions today for tomorrow’s challenges in light-vehicle gasoline and high-end gasoline engines. Features and benefits include: A patented Elastoval™ skirt for the highest strength-to-weight ratio A range of proprietary high-temperature alloys including FMB2 EconoMiser™ piston technology with up to 20 percent lower friction

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Goetze Rectangular Piston Rings

  • Brand Name Goetze
  • Product Category Large Bore Engine

Goetze Rectangular Piston Rings for 4-Stroke Large Bore Engines Piston ring with rectangular cross section that performs necessary sealing functions under normal operating conditions. With peripheral coating and appropriate barrel face, use is mainly in the top groove in automobile gasoline and diesel engines. In order to secure a good oil film between ring and cylinder, rectangular rings with a symmetrical or asymmetrical-barreled running surface are used as pressure rings in the first groove, as shown below. The running surface is the contour of the ring facing the cylinder surface. The objective of this running surface profile is to create a lubrication slot with a hydrodynamic film which the piston ring can slide on without touching the other surface. An optimized asymmetrical-barreled running surface ensures low lubricant consumption even after a very long running time. The additional angle on the running surface prevents the upper edge of the ring from touching the cylinder and transporting oil upwards into the combustion chamber. A common feature of a piston ring is a slot with a non-circular design. This non-circular form is necessary so that the piston ring exerts an exactly defined pressure over the whole ring circumference when inserted in the circular cylinder. This pressure can be distributed evenly over the circumference; however, a negative oval form is generally aimed for. This means that the pressure in the area of the slot is lower than on the remaining circumference which avoids increased pressure on the slot during operation of the engine.

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Goetze Taper Faced Piston Rings

  • Brand Name Goetze
  • Product Category Large Bore Engine

Goetze Taper Faced Piston Rings for 4-Stroke Large Bore Engines Due to the tapered running face, the ring contacts the cylinder bore with its bottom outer edge, which shortens running-in and improves oil scraping. Taper faced rings are chiefly installed in the second groove in mainly natural gas engines. A common feature of a piston ring is a slot with a non-circular design. This non-circular form is necessary so that the piston ring exerts an exactly defined pressure over the whole ring circumference when inserted in the circular cylinder. This pressure can be distributed evenly over the circumference; however, a negative oval form is generally aimed for. This means that the pressure in the area of the slot is lower than on the remaining circumference which avoids increased pressure on the slot during operation of the engine.

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Goetze Internally Bevelled Piston Rings

  • Brand Name Goetze
  • Product Category Large Bore Engine

Goetze Internally Bevelled Piston Rings for 4-Stroke Large Bore Engines Edge relief on the top side of rectangulartaper faced rings creates a twist effect which, without gas pressure loading, brings the ring into bore contact only with its bottom outer edge while the inner edge contacts the bottom groove side. Compression rings Internally Bevelled or Stepped Ring in combination with rectangular or taper faced ring One common feature of all piston rings is a slot and that they are manufactured to be non-circular. This non-circular form is necessary so that the piston ring exerts an exactly defined pressure over the whole ring circumference when inserted in the circular cylinder. This pressure can be distributed evenly over the circumference; however, a negative oval form is generally aimed for. This means that the pressure in the area of the slot is lower than on the remaining circumference which avoids increased pressure on the slot during operation of the engine.

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Goetze Keystone Piston Rings

  • Brand Name Goetze
  • Product Category Large Bore Engine

Goetze Keystone Piston Rings for 4-Stroke Large Bore Engines Compression ring with a wedge cross section. Due to the tapered sides, radial movement of the ring in engine operation will cause the axial clearance in the groove to increase and decrease. This greatly reduces ring sticking. Keystone ring Compression ring In order to secure an effective oil film between ring and cylinder, rectangular rings with a symmetrical or asymmetrical barrelled running surface are used as pressure rings in the first groove, as shown below. The running surface is the contour of the ring facing the cylinder surface. The objective of this running surface profile is to create a lubrication slot with a hydrodynamic film which the piston ring can slide on without touching the other surface. An optimized asymmetrical-barreled running surface ensures low lubricant consumption even after a very long running time. The additional angle on the running surface prevents the upper edge of the ring from touching the cylinder and transporting oil upwards into the combustion chamber. A common feature of a piston ring is a slot with a non-circular design. This non-circular form is necessary so that the piston ring exerts an exactly defined pressure over the whole ring circumference when inserted in the circular cylinder. This pressure can be distributed evenly over the circumference; however, a negative oval form is generally aimed for. This means that the pressure in the area of the slot is lower than on the remaining circumference which avoids increased pressure on the slot during operation of the engine.

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Elastothermic Piston

  • Product Category Pistons - Aluminum

Gallery cooled piston improves power and fuel consumption of downsized gasoline engines Elastothermic cooling gallery reduces the piston crown temperature by about 30°C Decreased temperature of the first ring groove by about 50°C, consequently reducing carbon deposition and groove & ring wear for long life low oil consumption and blow by Reduced risk of uncontrolled combustion such as low speed pre-ignition

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Aluminum Diesel Pistons

  • Product Category Pistons - Aluminum
  • Markets Light Vehicle Heavy-Duty

Federal-Mogul Powertains's aluminum diesel pistons are designed with the latest technology and best-in-class architecture for both light and heavy-duty vehicles, including gallery cooling where necessary. Features and benefits include: Optimized gallery locations for maximum cooling can result in up to a 10 percent lower bowl rim temperature Advanced side-casting techniques significantly improve structural stability (even with thin wall designs) Restructuring of the combustion-bowl rim and bowl base can provide up to a 100 percent increase in fatigue life

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UNIPISTON Bonded Clutch Piston

  • Product Category Bonded Transmission Piston
  • Markets Light Vehicle Heavy-Duty

This one-piece, rubber-to-metal bonded piston is designed to hydraulically engage clutches to activate the gearshift. It features a compact, one-piece design that: Reduces the number of leak paths Simplifies assembly Improves reliability Enables more compact design and configuration Our Unipiston® replaced the multi-component pistons and seals used in automatic transmission units with a single-piece bonded, sealed piston, delivering more reliable performance with lower in-place cost. The single-piece construction simplifies assembly and reduces potential leak paths.

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Scraper Piston Rings

  • Product Category Piston Rings
  • Markets Light Vehicle Heavy-Duty

Federal-Mogul Powertrain’s scraper rings are available with a comprehensive range of materials, technical designs and running face coatings. Form Optimized (FO) scraper rings provide maximum protection against oil consumption and blowby. Semi-inlaid type running faces utilize a sharp lower edge that’s optimal for oil control. Napier and interrupted Napier designs provide additional options for scraper ring oil control. Oil scraping effect can be increased with the addition of a “step” or twist feature. Most Federal-Mogul Powertrain scraper rings have a step recessed into the bottom outer face, which assures extremely effective oil scraping and increases the unit pressure. Additionally, the step relief causes a positive twist that, without gas pressure, brings the periphery into bore contact with only the very edge of the step. The volume created by the step is beneficial in allowing large amounts of oil to be stored.

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EcoTough Coated Pistons

  • Product Category Pistons - Aluminum
  • Markets Light Vehicle Heavy-Duty

The EcoTough® coated piston provides important benefits that help meet customer demands for more efficient engine designs, including reduced fuel consumption and CO2 emissions. It combines low wear and low friction in a single application and reduces fuel consumption by 0.8 percent as compared to conventional piston coatings. Key benefits include: Compatible with existing and advanced cylinder bore finishes and can be introduced seamlessly in volume engine production as a running change Composition provides greater thickness than pistons with conventional coatings, providing additional protection Fulfills stringent environmental standards; contains no toxic solvents Proprietary, advanced piston skirt coating with solid lubricants and carbon fibers reinforcement, especially designed for challenging gasoline applications 10% friction reduction in Power Cylinder Unit (piston+rings) vs. standard coatings, up to 0.4% fuel economy improvementCO2 reduction in european drive cycle tests 40% less wear than standard gasoline coatings, increased robustness in state-of-art boosted gasoline DI engines EcoTough® is a patented F-M coating

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EcoTough-D Pistons

  • Product Category Pistons - Steel
  • Markets Light Vehicle Heavy-Duty

EcoTough®-D has been developed for diesel pistons in both aluminum and steel, used in passenger cars and commercial vehicles. A polymer-based coating reinforced with short carbon fibers and containing graphite embedded as a solid lubricant, EcoTough®-D reduces piston friction by as much as 35% compared to conventional coatings in the market and improves wear resistance by up to 30%.

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Goetze PVD-Coated Piston Rings

  • Brand Name Goetze
  • Product Category Large Bore Engine

Goetze PVD-Coated Piston Rings for 4-Stroke Large Bore Engines PVD coated piston rings are exceptionally scuff and wear resistant with preferred coatings based on the CrN system. Alternative material systems like DLC (Diamond-Like Carbon) are being increasingly used with a view to reducing friction. Main applications: compression rings High wear resistance Coating material: PVD - coating (CrN) Coating application process: Physical Vapor Deposition (PVD) Chemical composition of the coating (% by weight): Expressed in crystal structure: CrN predominant (200) orientated, measured by x-ray diffractometer Hardness of the coating: 800 - 1400 HV 0.1 PVD technology (Physical Vapor Deposition) is a method of depositing hard coatings reactively from the vapor phase onto the surface of piston rings. This involves vaporizing and ionizing a metal by means of an arc or an inert gas ion bombardment. The metal ions are accelerated to the surface of the component, discharged and deposited. In the reactive process, the metal atoms combine with gas atoms, forming nitrides, carbides, oxides, etc. This causes thin and dense coatings to form true to contour on the surface of the component. Owing to the ceramic character of these coatings, PVD coated piston rings are exceptionally scuff resistant and extremely wear resistant. The PVD coatings preferred for piston rings are based on the CrN system. Alternative material systems like DLC (Diamond-Like Carbon) are being increasingly used with a view to reducing friction. DLC coated piston rings in gasoline engine applications demonstrate a significantly improved early life behaviour and reduced cylinder wear especially in combination with Al cylinder surfaces. Given the ceramic structure of PVD coatings, they are characterized by high residual stresses, placing restrictions on the usable coating thickness and the ring design (O.D. edge). However, it is anticipated that further improvement of the coating systems (multi-layer, multi-component, graduated hard coatings) compared to the CrN systems mostly in service today will enable more widespread use in the future. However, due to the very complex manufacturing process involved, for most applications it is too expensive. In addition, the limited coating thickness of up to around 50 μm is not sufficient for diesel operation in order to satisfy current requirements for the service life of rings.

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DuraBowl Aluminum Diesel Pistons

  • Product Category Pistons - Aluminum
  • Markets Light Vehicle Heavy-Duty

DuraBowl® Piston Reinforcement Partial Bowl-Edge Re-melting features: Extreme refinement of aluminum material structure created by localized re-melting using TIG technology Up to 4 times improved durability in high specific power engines compared to pistons without bowl re-melting. Allows higly stressed combustion bowl shapes F-M DuraBowl® process extends aluminum piston limits in the most challenging applications by increasing the fatigue strength (cycles) of the piston

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Magnum Monosteel Pistons

  • Product Category Pistons - Steel

The next-generation of the award-winning Monosteel® piston, Magnum Monosteel®, reduces piston mass by up to seven percent and includes key design features that reduce friction for improved fuel economy and lower emissions. Key features include: Double-band piston skirt design, a first for modern diesel pistons Dual friction-welded construction, enabling large cooling galleries for high temperature resistance and strength Friction reduction of 17 percent, when compared to conventional steel piston designs Evolution of Monosteel® with improved fuel economy for On-highway and industrial diesel engines. One percent (1%) fuel economy achieved through reduced reciprocating mass (up to 7%) and up to 40% reduction in skirt area. 17% average friction reduction over conventional pistons in engine tests Lower temperatures due to Monosteel® design of cooling gallery leading to increased durability Patents pending

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Goetze Diamond Coating Piston Rings

  • Brand Name Goetze
  • Product Category Large Bore Engine

Goetze Diamond Coating (GDC®) Piston Rings for 4-Stroke Large Bore Engines A refinement of chrome ceramic coatings, Goetze Diamond Coating (GDC® 50) has proved its excellent wear-resistance in large bore engines. It is a hard chromium coating reinforced with minute diamond particles embedded in the extremely fine crack network. Goetze Diamond Coating (GDC®) galvanic coating Main applications: compression rings Extremely high wear resistance, low cylinder wear, high thermal loading capacity Coating material: Chromium and diamond Coating application process: Electrochemical deposition Coating structure: Chromium coating with diamond (C) Hardness of coating: 900 - 1200 HV 0.1 In order to improve the wear resistance and tribological properties of the rings, different coatings have been used on running surfaces for many years. Galvanic coatings, thermal coatings and PVD coatings are used. With demands on the load levels of modern internal combustion engines ever increasing, there is often a need to improve the thermal andor mechanical load carrying capacity of piston ring coatings beyond early life. The patented coating system "Hard Chromium Matrix with Hard Particles Embedded in the Microcrack Network" meets such requirements for the whole life (thickness) of the coating. The variants resulting from the development effort, namely CKS® (chromium with aluminium oxide ceramic) and GDC® (chromium with microdiamond), have a crack network that extends either part-way or all the way through the thickness of the coating, depending on requirements, and is reinforced with embedded hard particles. As a refinement of the chrome ceramic coating, the Goetze Diamond Coating (GDC® 50) has proved its excellent wear-resistance in large bore engines. Instead of aluminium oxide particles which are embedded in the micro fissure network of the CKS layer, small diamond particles are used. This is a hard chromium coating reinforced with minute diamond particles embedded in the extremely fine crack network with substructure. Compared to CKS®, the coating wear was halved and scuff resistance further improved without significantly increasing cylinder wear. These diamond particles have both higher wear-resistance and offer the advantage that they turn into carbon at high local temperature peaks. This produces a self-lubricating effect (like graphite inclusions) and hence gives the coating higher scuff resistance.

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Goetze KV1 Piston Rings

  • Brand Name Goetze
  • Product Category Large Bore Engine

Goetze KV1 Piston Rings for 4-Stroke Large Bore Engines KV1, a low-alloyed heat-treated nodular cast iron, is a preferred material for compression rings. It is characterized by a bending strength >1300 MPa and high modulus of elasticity due to its martensitic microstructure and spherulitic graphite structure. Spheroidal graphite cast iron Main applications: compression rings High bending strength, high modulus of elasticity ISO 6621-3, subclass 52 Minimum bending strength: 1300 MPa Modulus of elasticity: min. 150 GPa Ring diameter range: ≤ 600 mm

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Goetze CR4 Piston Rings

  • Brand Name Goetze
  • Product Category Large Bore Engine

Goetze CR4 Piston Rings for 4-Stroke Large Bore EnginesHard chromium coatings are used on compression rings where the mechanicalthermal loads are greatest and on oil control rings with particularly high unit pressure. Special lapping improves oil film formation and the scuff threshold loads. CR4 Chrome coating Main applications: compression rings, oil control rings High wear resistance, low cylinder wear Coating material: chromium Coating application process: electrochemical deposition Hardness of coating: 900 - 1200 HV 0.1 In order to improve the wear resistance and tribological properties of the rings, different coatings have been used on running surfaces for many years. Galvanic coatings, thermal coatings and PVD coatings are used. Coatings can suffer damage in early life or after lengthy operating times. Adhesive wear (scuffing) andor fatigue-related peeling (the "peel and polish" phenomenon) can occur. For these reasons we developed a special surface topography, the special lap finish, as an addition to the standard lapping process used for hard chromium coatings. Special lapping improves oil film formation in early life and shifts the scuff threshold of hard chromed rings towards higher tolerable loads. The surface structure - plateaus alternating with valleys - eliminates roughness peaks, creates good bearing surfaces for a tight seal and contains oil pockets with the result that critical early-life conditions are better controlled.

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Goetze CKS Piston Rings

  • Brand Name Goetze
  • Product Category Large Bore Engine

Goetze CKS® Piston Rings for 4-Stroke Large Bore Engines CKS® was developed specifically for piston rings in the top groove in highly rated diesel engines. CKS has a crack network filled with aluminum oxide ceramic particles, giving significantly lower wear rate and scuff resistance compared to hard chromium. Chrome ceramic coating (CKS®) galvanic coating Main applications: compression rings High wear resistance, low cylinder wear, high thermal loading capacity Coating material: Chromium and aluminium oxide Coating application process: Electrochemical deposition Coating structure: Chromium coating with aluminium oxide (Al203) Hardness of coating: 900 - 1200 HV 0.1 In order to improve the wear resistance and tribological properties of the rings, different coatings have been used on running surfaces for many years. Galvanic coatings, thermal coatings and PVD coatings are used. With demands on the load levels of modern internal combustion engines ever increasing, there is often a need to improve the thermal andor mechanical load carrying capacity of piston ring coatings beyond early life. The patented coating system "Hard Chromium Matrix with Hard Particles Embedded in the Microcrack Network" meets such requirements for the whole life (thickness) of the coating. The variants resulting from the development effort, namely CKS® (chromium with aluminium oxide ceramic) and GDC® (chromium with microdiamond), have a crack network that extends either part-way or all the way through the thickness of the coating, depending on requirements, and is reinforced with embedded hard particles.

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Goetze F14 Piston Rings

  • Brand Name Goetze
  • Product Category Large Bore Engine

Goetze F14 Piston Rings for 4-Stroke Large Bore Engines Alloyed grey cast irons are used in a heat-treated condition (F14). Besides having a high bending strength and modulus of elasticity, an increased hardness of 320 to 470HB is produced to meet the required wear resistance in the uncoated condition. Carbidic cast iron Main applications: compression rings High bending strength, high modulus of elasticity, high wear resistance ISO 6621-3, subclass 32 Minimum bending strength: 650 MPa Modulus of elasticity: 130 - 160 GPa Ring diameter range: ≤ 700 mm

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Goetze K4 Piston Rings

  • Brand Name Goetze
  • Product Category Large Bore Engine

Goetze K4 Piston Rings for 4-Stroke Large Bore Engines KV4, a low-alloyed heat-treated nodular cast iron, is a preferred material for compression rings. For increased stresses a higher hardness is created by varying the martensite morphology. Bending strength > 1300 MPa with a high modulus of elasticity. Spheroidal graphite cast iron Main applications: compression rings High bending strength, high modulus of elasticity ISO 6621-3, subclass 56 Minimum bending strength: 1300 MPa Modulus of elasticity: min. 150GPa Ring diameter range: ≤ 1000 mm

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Daros GP50 Piston Rings

  • Brand Name Daros
  • Product Category Large Bore Engine

Daros GP50 Piston Rings for 2-Stroke Large Bore Engines The GP50 (CGI) high strength cast iron ring material is characterized by a vermicular graphite structure with pearlitic matrix and special carbides for LBE applications. Compression rings Technological properties: high strength above 145 mm nominal diameter ISO 6621-3, subclass 50 Minimum bending strength: 900 MPa Modulus of elasticity: minimum 140 GPa Ring diameter range: ≤ 1000 mm In order to satisfy the high requirements for piston rings, the basic material used in Federal-Mogul Powertrain piston rings comprises high-quality lamellar or spherolithic cast materials. The basic material is selected from a wide range according to application and fuel quality.

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Goetze STD Piston Rings

  • Brand Name Goetze
  • Product Category Large Bore Engine

Goetze STD Piston Rings for 4-Stroke Large Bore Engines The STD ring material is characterized by a fine-lamellar graphite structure in a pearlitic matrix and has good conformability due to a relatively low modulus of elasticity. Non heat-treated grey cast iron Main applications: compression rings, oil control rings Good conformability ISO 6621-3, subclass 12 Minimum bending strength: 350 MPa Modulus of elasticity: 85 - 115 GPa Ring diameter range: ≤ 700 mm

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Goetze Ni/C Piston Rings

  • Brand Name Goetze
  • Product Category Large Bore Engine

Goetze NiC Piston Rings for 4-Stroke Large Bore Engines NiC is a thermal sprayed coating which is mainly used on top of a wear resistant coating to achieve a smooth running in of ring and liner. NiC thermal coating Main applications: compression rings Running-in coating Coating material: NiC powder material Coating application process: Plasma spraying Chemical composition of the coating (% by weight): Ni: 68-87, C: 18-31, O: < 3

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Goetze AlBz Piston Rings

  • Brand Name Goetze
  • Product Category Large Bore Engine

Goetze AlBz Piston Rings for 4-Stroke Large Bore Engines AlBz is a thermal sprayed coating which is mainly used on top of a wear resistant coating to achieve a smooth running in of ring and liner. Main applications: compression rings Running-in coating Coating material: AlCuFe Coating application process: Arc wire spraying Chemical composition of the coating (% by weight): Al: 5-7, Fe 1-3, Others: max. 0.5, Rest: Cu Hardness of the coating: Average 105-158 HV 0.1

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Goetze MKP 81A Piston Rings

  • Brand Name Goetze
  • Product Category Large Bore Engine

Goetze MKP 81A Piston Rings for 4-Stroke Large Bore Engines Metal-ceramic composite coatings today predominate in most diesel engine applications as armoring for the running face of piston rings. The MKP 81A coating is used particularly successfully in different applications subject to increased risk of scuffing. MKP 81A thermal coating Main applications: compression rings High wear resistance, low cylinder wear and enhanced thermal loading capacity Coating material: Powder composed of molybdenum and hard material Coating application process: Plasma spraying Chemical composition of the coating (% by weight): Mo: 67-77, Ni: 16-24, Cr: 3.0-7.0, C: 0.5-2.0 Hardness of the coating: Average 370 - 860 HV 0.1 Strength: minimum 35Nmm² In order to improve the wear resistance and tribological properties of the rings, different coatings have been used on running surfaces for many years. Galvanic coatings, thermal coatings and PVD coatings are used. Spray coatings on piston rings in the top groove are preferred to hard chromium plated rings above all when engines - chiefly diesel engines - are subject to increased risk of scuffing. Materials deposited by a spray process can better withstand this adhesive wear caused by direct metal-to-metal frictional contact, as in some cases they have a very high ceramic content. Metal-ceramic composite coatings today predominate in most applications as armoring for the running face of piston rings in diesel engines, while molybdenum coatings are now only used occasionally because of their comparatively low wear resistance. For the manufacture of metal-ceramic composite coatings the plasma spraying process is still largely used. The coating known by the name MKP 81A is used particularly successfully in different applications.

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