The Mercedes Benz Om606 engine has quietly become a legend among diesel performance enthusiasts. For those in the know, this inline-6 cylinder diesel represents an incredible platform for power and reliability, often exceeding what’s achievable with comparable gasoline engines, especially when considering fuel economy. Let’s delve into why the OM606 is hailed as a “superstar” and a prime choice for engine swaps and high-performance builds.
Why the OM606 Earns its “Superstar” Status
The OM606 engine, part of the OM60X family (which also includes the OM602 and OM603), stands out for several key reasons. Its robust, mechanically-driven design means durability and ease of maintenance. Unlike more complex modern engines, the OM606, in its original mechanical injection form, can be readily installed and operated in virtually any vehicle without the need for intricate electronic controls. This makes it a favorite for engine swaps into cars, trucks, and even off-road vehicles.
Moreover, the OM606 boasts impressive power potential even with stock internals. Enthusiasts routinely push these engines to produce 400-500 wheel horsepower (WHP) with relatively straightforward modifications. And remarkably, even when tuned for significant power gains, the OM606 can still deliver around 30 miles per gallon, a feat rarely matched by high-performance gasoline counterparts.
Unlocking Performance: Key OM606 Modifications
Achieving substantial power from an OM606 typically involves a focused set of upgrades, primarily centered around fuel and air management. Here are the common modifications:
- Injection Pump Upgrade: This is often the first and most impactful modification. Swapping the stock pump for a larger capacity unit, such as a 7.5mm pump for street performance or an 8mm pump for more extreme builds (600+ HP), provides the necessary fuel to support higher power levels. E injection pumps, paired with a DSL1 computer, offer even greater tunability.
- Turbocharger Upgrade: A larger, performance-oriented turbocharger is essential to force more air into the engine, complementing the increased fuel delivery.
- Exhaust Header: A custom exhaust header improves exhaust flow, reducing backpressure and further enhancing turbocharger efficiency and engine breathing.
- Intercooler: A larger intercooler is crucial to cool the intake air charge, increasing air density and preventing power-robbing heat buildup.
For transmission options, the Mercedes 722.6 5-speed automatic is a popular choice, known for its robustness. It can be further enhanced with AMG V8 specification rebuilds or by sourcing an AMG transmission directly. For those seeking manual control, BMW manual transmissions can be adapted to the OM606 with relative ease. Electronic transmission controllers like OFGear further refine automatic transmission performance, allowing for adjustments to shift firmness and shift points, especially when paired with engine management systems like the DSL1.
Community and Expertise Supporting OM606 Builds
The OM606’s rising popularity is supported by a growing community and specialized businesses. Companies like Dieselmeken and DieselpumpUK in Europe, and BenzForce in the US, are key players in providing performance parts and expertise. These specialists offer everything from high-performance injection pumps and turbo kits to complete engine building services and dyno tuning. Figures like Dale at DieselpumpUK and the team at FTune are frequently mentioned within the OM606 performance community, showcasing their hands-on experience and continuous development of OM606 platforms in various vehicles, from Mercedes G-Wagens and classic sedans to American trucks like the Ford F-250.
Enthusiast communities and forums, such as SuperTurboDiesel.com, serve as valuable resources for sharing build information, tuning tips, and showcasing impressive OM606 projects. Examples range from classic Mercedes chassis to more unconventional swaps like a ’32 Ford, ’56 Cadillac, and even a ’34 Volvo, demonstrating the engine’s versatility.
Pushing the Limits: For Extreme OM606 Power
For those aiming beyond the 500 WHP mark and seeking truly extreme performance, the OM606 platform can be further strengthened. Upgrades like beefy connecting rods, main bearing cradles, and performance valve spring kits allow the engine to reliably handle significantly increased power and higher RPM ranges, potentially reaching 6000-8000 RPM. These modifications cater to those looking to maximize the OM606’s potential for racing or demanding performance applications.
In conclusion, the Mercedes Benz OM606 engine has rightfully earned its reputation as a “superstar” diesel. Its blend of mechanical simplicity, inherent robustness, impressive power ceiling, and surprising fuel efficiency makes it an exceptional choice for both straightforward performance upgrades and ambitious engine swap projects. Whether you are looking for a reliable daily driver with a performance edge or a unique and powerful platform for a custom build, the OM606 deserves serious consideration.
