M113 Engine

Specifications

The M113 engine is a 90-degree V8 powerplant produced between 1997 and 2007, widely regarded for its durability, mechanical simplicity, and strong performance characteristics. It features an aluminum alloy block and cylinder heads designed to reduce weight while maintaining structural integrity, along with a single overhead camshaft (SOHC) valvetrain per cylinder bank using a three-valve-per-cylinder configuration to optimize airflow and combustion efficiency. The engine incorporates a twin-spark ignition system that improves combustion stability, enhances fuel efficiency, and reduces emissions. 

Its naturally aspirated versions of the M113, with displacements ranging from 4.3 L to 5.0 L, typically produce between 275 and 306 horsepower, emphasizing strong low- and mid-range torque delivery. The 5.0 L variant employs a bore of 97 mm and a stroke of 84 mm, resulting in a near-square design that produces approximately 460 N·m of torque while maintaining long-term reliability through reduced internal stress. It offers up to 577 horsepower through reinforced internal components and enhanced cooling systems.   

Engine Variants

M113 E43 (4.3 L)

This engine was installed in several Mercedes-Benz models between 1997 and 2002, including the E 430, S 430, ML 430, and CLK 430. This variant emphasized smooth power delivery and durability, making it well suited for luxury sedans and SUVs. It provided balanced performance while maintaining the M113’s reputation for reliability and low maintenance requirements.

M113 E50 (5.0 L)

This variant was used in vehicles such as the W210 E 500 and W220 S 500 until 2002. With increased displacement compared to the E43, the E50 delivered higher torque output and improved acceleration while retaining a naturally aspirated configuration. This version represented a balance between performance and refinement in upper-tier Mercedes-Benz models.

M113 E55 (5.4 L naturally aspirated)

This engine was introduced around 2000 for AMG performance models. As a naturally aspirated powerplant, it produced significantly higher output than standard M113 variants while maintaining smooth throttle response. This engine marked AMG’s transition toward higher-performance V8 applications prior to widespread use of forced induction.

M113 K (5.5 L supercharged)

This variant is a high-performance AMG “compressor” engine featured in models such as the E55 AMG and SL55 AMG. Equipped with an Eaton supercharger and reinforced internal components, this variant achieved power outputs exceeding 500 horsepower. The combination of forced induction and robust construction made it one of the most powerful and durable V8 engines of its era.

M113.985 (6.3 L)

This variant is a rare, hand-built engine developed for early AMG prototypes. Featuring a significantly increased displacement, it served primarily as a test platform rather than a mass-produced engine. This version demonstrated the upper limits of the M113 architecture and influenced later high-performance AMG engine development.

Frequently Asked Questions