Brand New Left Exhaust Camshaft for Mercedes-Benz M278 4.6L/4.7L (4663cc) V8 Engine (Part No. 2780509301)
The Mercedes-Benz M278 engine (a 4.6L/4.7L twin-turbocharged V8) features a double overhead camshaft (DOHC) layout for each cylinder bank and is equipped with a continuously variable valve timing (VVT) system on both the intake and exhaust sides.
Description
Camshaft Core Specifications
Engine Code: M278 (4.6L/4.7L twin-turbocharged)
Layout: 4 camshafts total (2 per cylinder bank)
Material: Precision-machined cast iron or forged steel/alloy
Valvetrain: Double Overhead Camshaft (DOHC), 4 valves per cylinder
Valvetrain Key Characteristics
Variable Valve Timing (VVT): Utilizes a hydraulic vane-type adjuster; compared to the older M273 engine, it offers a wider adjustment range, thereby optimizing performance and efficiency across the entire RPM range.
High-Pressure Pump Operation: The high-pressure fuel pump (supplying 120–200 bar of pressure to the piezo injectors) is mounted at the rear of the right-side intake camshaft and is driven by four additional cam lobes.
Adjuster Components: When replacing or upgrading, specific OEM components are typically categorized by cylinder bank (left/right) and function (intake/exhaust).
OEM part numbers include 278-050-93-01 (left exhaust) and 278-050-94-01 (right exhaust).












