Piston Ring Types - Oil Control Rings

Oil control rings are located in the bottom piston groove and their function is to control the supply of oil to cylinder wall to lubricate the piston skirt– and keep excess oil out of the combustion chamber. There are a variety of oil control ring designs as detailed below that are suitable for different applications.

Drainage holes or slots are provided to prevent oil from accumulating between the two outer lands.

Single-Piece Oil Control Rings

Designed to prevent oil passing from the space between the face of the ring and the cylinder.

Slotted Oil Control Ring:

The slot in the radial centre of the ring allows the excess oil to flow back to the reservoir and control the amount of lubricating oil up or down the cylinder walls. The parallel lands width is smaller than the overall width creating a higher unit pressure.

Bevelled Edge Oil Control Ring:

The outer lands are bevelled (or chamfered) on this style of ring which increases the contact pressure between the ring and liner to a higher degree than the slotted oil control ring.

Double Bevelled Edge Oil Control Ring:

The lands on the edge connecting to the combustion champion are both bevelled on this type of ring. This reduces oil consumption due to improved scraping from the chamfered edge.

Two-Piece Oil Control Rings:

In modern engines multi-piece oil control rings are more frequently used than single piece control rings as the meet today’s higher performance requirements of ring flexibility. Two-piece oil control rings are produced with a heat-resistant spring steel around the ring circumference to maintaining greater pressure and contact with the liner whilst maintaining oil economy. The coil spring is positioned in semi-circular or V-shaped groove which reduces the moment of inertia.

Coil Spring Loaded Slotted Oil Control Ring:

As the slotted oil ring control – the coil spring loaded oil control ring has two parallel outer lands. This ring also has a grove running inside the diameter to house the coil spring. There a number of variations to the coil spring loaded oil control ring:

1. Coil Spring Loaded Slotted Oil Control Ring
2. Coil Spring Loaded Bevelled Edge Oil Control Ring
3. Coil Spring Loaded Double Bevelled Oil Control Ring
4. Coil Spring Loaded Bevelled Edge Oil Control Ring with Chromed, Profile Ground Lands
5. Nitrided Profiled Steel Ring

Licence Terms

You are free to: Share, copy & redistribute the material in original format for any purpose as long as you follow the license terms below:

• Attribution – you must give appropriate credit and provide a link to the original article in a reasonable and visible manner
• You may not in any way suggest that the licensor endorses you or your use.
• No Derivatives – The material must be distributed in full, including disclaimer, you may not distribute or share modified material.
• No additional restrictions – You may not apply legal terms that legally restrict others from doing anything the licence permits.
• No warranties are given. The license may not give you all of the permissions necessary for your intended use. For example other rights such as publicity, privacy, or moral rights may limit how you use the material.

Disclaimer

Anglo Agriparts nor any such reviewers or contributors of content provides any warranty or guarantee as to the accuracy of any information on this website and cannot accept liability for any errors or omissions. The information in this article are for general information purposes only. It does not constitute legal, technical and/or commercial advice and should not be relied upon as such. Specific advice should always be sought separately. Despite the authors best efforts the information provided in this article may not be accurate, up to date or applicable to the circumstances of any particular case. Anglo Agriparts nor the author of this article make no representations or warranties of any kind regarding the completeness or accuracy of the information contained herein and accepts no liability for loss or damage whatsoever and howsoever arising from reliance on it, regardless of whether such information originates from Anglo Agriparts, or our contributors. Anglo Agriparts has no control over the content on any other website accessed through this website and accepts no liability for any loss or damage whatsoever and howsoever arising from reliance upon the content of such websites. Neither Anglo Agriparts nor any reviewer or contributor of content on the website shall be liable to any person for any loss or damage which may arise from the use of the information contained in this article or on this website. These exclusions of liability will not apply to damages arising from death or personal injury caused by the negligence of Anglo Agriparts or any of its employees or agents or of a reviewer or contributor of content.