Overview and Scope SAE J1312 provides a standardized test procedure for generating engine performance maps, which list fuel flow rates versus torque or power at specific engine speeds and loads. These maps are essential inputs for fuel economy simulation programs.…

This article summarizes the key information from SAE J775-2018, an information report that provides engineers with a comprehensive guide to engine poppet valves, including nomenclature, alloy designations (UNS), chemical compositions, metallurgy and heat treatments, properties, application guidance, valve design and…

Engine preheaters are essential for reliable cold-weather starting of internal combustion engines. SAE J226, a long-established standard, specifies performance and testing for these devices. This article reviews the standard’s stabilized status, key design considerations, and practical insights for engineers working…

Overview and Design Insights The SAE J1172-2012 recommended practice defines essential requirements for engine flywheel housings with sealed flanges. This standard is critical for ensuring leak-free operation, dimensional consistency, and component interchangeability across automotive and industrial powertrain systems. Stabilized in…

The SAE J2554-2021 standard provides a uniform test method for evaluating the water separation performance of engine intake air filtration systems. It is primarily intended for heavy-duty engines but also applies to automotive and industrial systems where water separation is…

The SAE J304™ information report, revised in March 2023, serves as a comprehensive reference for standardized engine oil testing. It describes test conditions and performance evaluation factors for both diesel and gasoline engines used to measure requirements defined by API…

SAE J1339:2024 is a recommended practice for testing and evaluating the approximate performance of engine-driven cooling fans. It provides a standardized method to measure airflow, pressure, and power consumption, enabling engineers to estimate cooling performance and net engine power. The…

SAE J1390-2022 provides a structured framework for structural analysis of engine cooling fans, emphasizing fatigue resistance and resonance avoidance. The practice covers three progressive levels: initial structural integrity assessment, in-vehicle strain gage testing, and laboratory durability validation. This article summarizes…

Overview of Dynamometer Driving Schedules This SAE Information Report (J1506) describes various dynamometer driving schedules used globally for measuring exhaust emissions and fuel economy of passenger cars and light trucks. The document includes descriptions and second-by-second speed-time sequences for schedules…

The SAE J1148-2010 standard provides essential nomenclature and terminology for engine charge air coolers (CACs), related components, and operational parameters. Though cancelled and now part of SAE J1726, this guide helps engineers communicate clearly throughout design and testing. Charge Air…

When designing automotive cooling systems, the reliability of the engine coolant pump seal is critical. For decades, the SAE J780 standard provided a common framework for seal sizes and terminology. Although cancelled in 2002, its definitions and envelope dimensions remain…

Understanding how cast irons behave at elevated temperatures is crucial for automotive and industrial applications where components must withstand high heat and stress over time. This article summarizes key data and insights from SAE Information Report J125-2018, which covers the…

As hydrogen and fuel cell vehicles become more common, first and second responders must be prepared to handle incidents involving compressed hydrogen systems and high-voltage electrical systems. SAE J2990-1 provides critical recommended practices for vehicle identification, system disabling, emergency documentation,…

Purpose and Scope of SAE J1849-2020 SAE J1849-2020 establishes laboratory test procedures, requirements, and guidelines for evaluating the performance of electronic siren systems with a single loudspeaker and electromechanical sirens used on authorized emergency vehicles. The standard aims to provide…

Developing a robust battery system for electric vehicles (EVs) and hybrid electric vehicles (HEVs) involves navigating a complex landscape of performance, safety, and integration challenges. SAE J2289, Electric-Drive Battery Pack System: Functional Guidelines, provides a foundational framework for engineers and…

SAE J1448-1984 provides a systematic approach for evaluating the electric-field susceptibility of electronic equipment using TEM cells in the frequency range from 14 kHz to 200 MHz. This Information Report is intended for diagnostic testing to identify frequencies of susceptibility,…

SAE J1837-2017 specifies physical and performance requirements for electrodeposited copper, nickel, and chromium coatings on zinc alloy die castings and wrought zinc strip used for exterior ornamentation. Designed for automotive, truck, marine, and farm environments, this standard ensures a bright,…