International announces EPA 2027 compliant S13 diesel engine
12 January 2026
International Motors announced its 2027 S13® Integrated Powertrain meets the US Environmental Protection Agency’s (EPA) emission requirements for model year 2027 heavy-duty engines. Developed from a clean sheet design starting in 2017, the current platform of the S13 Integrated Powertrain was launched for the 2024 model year.
The 2027 S13 Integrated Powertrain carries over 90% of hardware from the current platform. The updated powertrain will provide similar fuel economy, driving experience, and powertrain weight as today’s S13 Integrated Powertrain, according to International.
The 2027 S13 engine features a less complex design, while meeting more stringent NOx emission standards: the 2027 NOx limit (FTP) is 0.035 g/hp-hr, compared to the current limit of 0.2 g/bhp-hr. The 2027 engine uses a dual-stage SCR aftertreatment without exhaust heaters, while exhaust gas recirculation (EGR) has been entirely eliminated. The current S13 engine uses a dual SCR system in combination with un-cooled EGR.
Several technologies remain unchanged from the current S13 platform, including:
- Fixed-geometry turbocharger with “smart DEF dosing” (presumably Scania turbo dosing), dual overhead cam design, and 23:1 compression ratio.
- T14® 14-speed transmission with planetary gearset, electronic clutch actuator, integrated PTO options, and advanced oil lubrication system.
- Same size, packaging, and service intervals of the dual-stage aftertreatment system.
New technologies for 2027 include:
- Variable Valve Timing (VVT), which enables Variable Valve Braking (VVB) for improved braking performance, closed crankcase breather, and oil centrifuge.
- T14 Transmission: 24V Transmission Control Module with predictive shifting using GPS and topography data.
- A standardized 24V electrical architecture across the entire powertrain platform (alternator, starter, and engine controllers). A 12V electrical system is retained for the cab and chassis, battery accessories, and body controls.
The S13 powertrain is approved for use with R100 renewable diesel. Trials for B100 biodiesel compatibility are underway.
The International S13 Integrated Powertrain is a collaboration with Scania, which together with International is part of the Volkswagen-owned Traton Group.
Source: International Motors