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Standard

Internal Combustion Engines - Piston Vocabulary

2019-08-15
WIP
J2612
This SAE Standard defines the most commonly used terms for pistons. These terms designate either types of pistons or certain characteristics and phenomena of pistons. The terms and definitions apply to pistons for reciprocating internal combustion engines and compressors working under analogous conditions.
Standard

Power Cylinder Oil Consumption: Transport Mechanisms

2018-07-27
CURRENT
J2794_201807
This document covers oil transport mechanisms from the power cylinder system which might affect oil consumption. It will not discuss in detail the oil consumption mechanisms from other systems or engine components.
Standard

Power Cylinder Friction: Mechanisms

2018-05-16
CURRENT
J2904_201805
This document covers the mechanisms from the power cylinder which contribute to the mechanical friction of an internal combustion engine. It will not discuss in detail the influence of other engine components or engine driven accessories on friction.
Standard

Internal Combustion Engines - Piston Ring-Grooves

2018-05-16
CURRENT
J2275_201805
There is no ISO standard equivalent to this SAE Standard. This SAE standard identifies and defines the most commonly used terms for piston ring-groove characteristics, specifies dimensioning for groove widths, and demonstrates the methodology for calculation of piston groove root diameter. The requirements of this document apply to pistons and rings of reciprocating internal combustion engines and compressors working under analogous conditions, up to and including 200 mm diameter and 4.5 mm width for compression rings and 8.0 mm width for oil rings. The specifications in this document assume that components are measured at an ambient temperature of 20 °C (68 °F). Tolerances specified in this document represent practical functional limits and do not imply process capabilities.
Standard

Power Cylinder Blow-By: Blow-By Mechanisms

2014-08-28
CURRENT
J2797_201408
This document covers the mechanisms associated with the power cylinder system which might affect blow-by. It will not discuss in detail the blow-by mechanisms from other systems or engine subsystems.
Standard

Power Cylinder Scuffing: Mechanisms

2014-04-29
WIP
J3070
This document describes the various scuffing failure modes of the power cylinder system in an internal combustion engine. The causes and preventative measures for each failure mode are discussed. It should be noted that many remedies for scuff can lead to NVH (Noise Vibration and Harshness) issues. However NVH is not considered in this document.
Standard

Internal Combustion Engines—Piston Ring-Grooves

2010-01-19
HISTORICAL
J2275_201001
There is no ISO standard equivalent to this SAE Standard. This SAE standard identifies and defines the most commonly used terms for piston ring-groove characteristics, specifies dimensioning for groove widths, and demonstrates the methodology for calculation of piston groove root diameter. The requirements of this document apply to pistons and rings of reciprocating internal combustion engines and compressors working under analogous conditions, up to and including 200 mm diameter and 4.5 mm width for compression rings and 8.0 mm width for oil rings. The specifications in this document assume that components are measured at an ambient temperature of 20 °C (68 °F). Tolerances specified in this document represent practical functional limits and do not imply process capabilities.
Standard

Power Cylinder Friction: Mechanisms

2010-01-14
HISTORICAL
J2904_201001
This document covers the mechanisms from the power cylinder which contribute to the mechanical friction of an internal combustion engine. It will not discuss in detail the influence of other engine components or engine driven accessories on friction.
Standard

Internal Combustion Engines--Piston Rings--Expander/Segment Oil Control Rings

2008-06-30
CURRENT
J2004_200806
This SAE Standard is equivalent to ISO Standard 6627 TR. Differences, where they exist, are shown in Appendix A with associated rationale. This SAE Standard specifies the dimensional features of commonly used oil control rings having two steel segments (rails) separated and expanded by one steel expander/spacer. The segments vary in width from 0.4 to 0.6 mm. The assembly width ranges from 2.5 to 4.75 mm. The 4.75 mm width is equivalent to existing 3/16 in applications. Expander design will vary considerably with piston ring manufacturer. The total circumferential deflection and the piston groove depth should be considered when designing these oil rings to optimize the fit of the ring assembly into the piston groove. This document applies to oil control rings up through 125 mm for reciprocating internal combustion engines. It may also be used for piston rings of compressors working under similar conditions.
Standard

Internal Combustion Engines--Piston Rings--Rectangular Rings

2008-06-30
CURRENT
J1997_200806
This SAE Standard specifies the essential dimensional features of R, b, and M rectangular piston ring types. Dimensional tables 8 and 9 offer the choice of two radial wall thicknesses: a. radial wall thickness "regular" (table 8); b. radial wall thickness "D/22" (table 9). The requirements of this document apply to rectangular rings for reciprocating internal combustion piston engines up to and including 200 mm diameter. They may also be used for piston rings of compressors working under similar conditions.
Standard

Internal Combustion Engines--Piston Rings--Quality Requirements

2008-06-30
CURRENT
J1996_200806
This SAE Standard specifies the quality aspects that are capable of definition but not normally found on a drawing specification. The difficulty of trying to define in absolute terms the quality attainable in normal commercial manufacture of piston rings is well known. In this document the commonly encountered aspects of quality in terms of casting defects and other departures from ideal are quantified. Many minor defects are clearly quite acceptable; other defects because of size or numbers are inadmissible. This document covers the following: a) Single piece piston rings of grey, carbidic, malleable, spheroidal graphite cast iron or steel; b) Multipiece pistong rings (oil control rings) consisting of cast iron parts and spring components; c) Single piece and multipiece rings of steel, i.e., oil control rings in the form of strip steel components or steel segments (rails) with spring expander components.
Standard

Internal Combustion Engines--Piston Rings--Scraper Rings

2008-06-30
CURRENT
J1999_200806
This SAE Standard specifies the essential dimensional features of N, NM, E, and EM scraper piston ring types. Dimensional Tables 7 and 8 offer the choice of two radial wall thicknesses: Radial wall thickness 'regular' (Table 7) Radial wall thickness 'D/22' (Table 8) The requirements of this document apply to scraper rings for reciprocating internal combustion piston engines up to and including 200 mm diameter. They may also be used for piston rings of compressors working under similar conditions.
Standard

Internal Combustion Engines--Piston Rings--Rectangular Rings With Narrow Ring Width

2008-06-30
CURRENT
J1998_200806
This SAE Standard specifies the essential dimensional features of R, B, and M rectangular piston ring types with narrow ring width. Dimensional tables 8 and 9 allow for the use of cast iron (table 8) or steel (table 9). Since the modulus of elasticity of steel rings is higher than that of cast iron rings, the fluctuation in the surface pressure will become greater if the free gap is set as the reference for force. Therefore, forces are set using the surface pressure as the reference, in order to minimize the effect of the fluctuation. The requirements of this document apply to rectangular rings for reciprocating internal combustion engines up to and including 90 mm diameter for cast iron rings and up to and including 100 mm diameter for steel. They may also be used for piston rings of compressors working under similar conditions.
Standard

Internal Combustion Engines--Piston Rings Coil Spring Loaded Oil Control Rings

2008-06-30
CURRENT
J2003_200806
This SAE Standard is equivalent to ISO Standard 6626. Differences, where they exist, are shown in the appendix with associated rationale. This document specifies the essential dimensions of piston ring types DSF-C, DSF-CNP, SSF, GSF, DSF, DSF-NG, and SSF-L coil spring loaded oil control rings. For the cast iron part the recommended material is class 10 according to SAE J1590. For special applications material classes 20 to 50 may be used. Variation in face design and spring groove from these may be used, as recommended by individual manufacturers, in plain or chromed versions. The tangential forces of coil spring loaded oil control rings can be varied over a wide range. Explanations and recommendations are given in Section 6. The normal range for axial width of coil spring loaded oil control rings (3 to 8 mm inclusive) is divided into 0.5 or 1.0 mm steps.
Standard

Internal Combustion Engines--Piston Rings--Oil Control Rings

2008-06-30
CURRENT
J2002_200806
This SAE Standard is equivalent to ISO Standard 6625. Differences, where they exist, are shown in Appendix A. This SAE Standard specifies the dimensional features of S, G, D, and DV oil control piston ring types. The normal range for the axial width of oil control rings (2.5 to 8 m inclusive) is divided into 0.5 or 1.0 increments. In Table 7, dimensions in inch units are given for oil control rings with axial width 4.75 m (equal to 3/16 in) for existing applications. The requirements of this document apply to oil control rings for reciprocating internal combustion piston engines up to and including 200 mm in diameter. They may also be used for piston rings of compressors working under similar conditions.
Standard

Internal Combustion Engines--Piston Rings--Half Keystone Rings

2008-06-30
CURRENT
J2001_200806
This SAE Standard is equivalent to ISO Standard 6624/2 TR. Differences, where they exist, are shown in Appendix A. This SAE Standard specifies the essential dimensional features of HK- and HKB- half keystone rings with narrow ring width types. Dimensional and allow for the use of cast iron (Table 6) or steel (Table 7). Since the modulus of elasticity of steel rings is higher than that of cast iron rings, the fluctuation in the surface pressure will become greater if the free gap is set as the reference for forces. Therefore, forces are set using the surface pressure as the reference in order to minimize the effect of the fluctuation. The requirements of this document apply to half keystone rings of reciprocating internal combustion engines up to and including 70 mm diameter for cast iron rings and up to and including 100 mm diameter for steel rings.
Standard

Internal Combustion Engines--Piston Rings--Keystone Rings

2008-06-30
CURRENT
J2000_200806
This SAE Standard is equivalent to ISO Standard 6624/1. Differences, where they exist, are shown in Appendix A. This SAE Standard specifies the essential dimensional features of T, TB, TM, K, KB, and KM keystone piston ring types. The requirements of this document apply to compression rings for reciprocating internal combustion engines up to and including 200 mm diameter.
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