Federal-Mogul Corporation

United States

Goetze Keystone Piston Rings


Goetze Keystone Piston Rings

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.


  • BRAND : Goetze
  • Product Category : Large Bore Engine


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Southfield, MI 48033, , United States

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