As fuel economy and emissions regulations become more stringent, accurately quantifying component-level parasitic losses is critical for vehicle-level modeling. The SAE J3039-2020 recommended practice addresses this need specifically for power transfer units (PTUs) in all-wheel-drive (AWD) passenger cars and SUVs.…

Radial lip oil seals are critical components for retaining lubricants and excluding contaminants in rotating machinery. The interference fit between the sealing lip and the shaft generates the necessary radial force for sealing, but it also produces frictional torque. This…

Rolling resistance is a critical parameter for truck and bus tires, directly affecting fuel efficiency and vehicle operating costs. SAE J1380-2020, The Measurement of Highway Truck and Bus Tire Rolling Resistance, is an information report that provides detailed background and…

Scope and Key Definitions The SAE J1203-1999 standard specifies a test procedure for determining the luminous transmittance of automotive windshield safety glazing materials. The test is performed with the glazing positioned at its actual installation angle to reflect real-world performance.…

This recommended practice establishes a comprehensive method for measuring total motorcycle sound pressure levels under full throttle acceleration and closed throttle deceleration. Unlike standards focusing solely on exhaust noise, SAE J331 captures contributions from exhaust, intake, mechanical components, tires, and…

SAE J160-2013 provides a comprehensive method for evaluating how friction materials and noise insulators behave when exposed to high temperatures. Dimensional stability is critical for brake performance—uncontrolled swelling or growth can lead to brake drag, rotor thickness variation, and altered…

SAE J2725 provides a standardized method for determining the elastic constants of friction materials using precise ultrasonic velocity measurements. This standard is essential for engineers working with brake pad characterization and system modeling, as it accounts for the non-linear behavior…

The SAE J2572-2024 recommended practice provides uniform chassis dynamometer test procedures for determining fuel consumption and range of fuel cell and hybrid fuel cell vehicles fueled by compressed gaseous hydrogen. Focused on light-duty vehicles, it uses the Urban Dynamometer Driving…

The SAE J1752/3-2017 standard provides a robust and reproducible method for measuring electromagnetic radiation from integrated circuits (ICs). By integrating the IC test board into the wall of a TEM or wideband TEM (GTEM) cell, this approach eliminates the influence…

🛠️ Accurate measurement of brake fluid temperature is essential for evaluating brake system performance, fluid stability, and vehicle safety. SAE J291 is a stabilized recommended practice that specifies procedures for measuring brake fluid temperature during road tests. First published in…

The SAE J1075–2021 standard provides a consistent, repeatable approach for measuring sound levels at construction site boundaries. It offers two validated methods—manual sampling with a sound level meter and integrating-averaging with an integrating sound level meter—to determine a representative sound…

SAE J1096 (APR2021) is a recommended practice that outlines a standardized method for measuring the maximum exterior sound level of heavy-duty trucks and tractors with a GVWR over 4540 kg, equipped with governed engines, under stationary conditions. This test is…

The SAE J2889-1 standard defines an engineering method for measuring the sound emitted by M and N category road vehicles at standstill and low speed conditions. This measurement is essential for pedestrian safety, helping to ensure that quiet vehicles produce…

SAE J1752-2 defines a standardized approach for evaluating near-field electric or magnetic components at the surface of an integrated circuit (IC). Using loop probes and precision scanning, this method identifies internal RF sources and produces color-enhanced field strength maps. It…

This article covers the SAE J177 recommended practice for analyzing carbon dioxide, carbon monoxide, and oxides of nitrogen in diesel engine exhaust under steady-state conditions. The standard relies on nondispersive infrared (NDIR) techniques for CO2, CO, and NO, and chemiluminescence…

Why Underlayer Distribution Matters The underlayer, also known as the backing layer, is the material between the friction compound and the shoe plate. Its distribution across the pad directly influences brake performance, lining life, and wear uniformity. Measuring this distribution…

Snowmobile noise regulation is critical for environmental and community standards. The SAE J192-2021 standard provides a comprehensive method for determining the maximum exterior sound level of snowmobiles. This article breaks down the key aspects of the standard, including instrumentation requirements,…