| Series 50 Engine |
| Evolution of a Winner |
| The new Series 50 evolved from the Series 60 engine for the truck market with the same excellent fuel consumption, durability, and low emissions. The Series 50 is a four cylinder version of the six cylinder 12.7L Series 60. It incorporates many of the same parts: |
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- Electronic controls
- Cylinder kits
- Bearings
- Gear train
- Rocker arms
- Valves
- Water pump
- Fuel pump
- Electronic unit injectors
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| Using the same proven Series 60 design philosophy, components of the Series 50 were modified to accommodate two less cylinders. As a result, the Series 50 is an lly controlled, overhead cam, turbocharged, air-to-air intercooled engine. The counter-rotating balance shafts allow the Series 50 to offer the same smooth performance as the Series 60. |
| The Series 50 has (6) ratings emission certified which meet the 1998 U.S. on-highway trucks emission standards. |
| Horsepower ratings at 2100 RPM provide maximum performance and work well with automatic transmissions. Properly operated and geared, they can be as economical on fuel as the 1800 RPM models, and they possess greater performance potential. |
| Features |
| Overhead Camshaft Design |
| The overhead cam design allowed DDC engineers to optimize the intake and exhaust air passages in the cylinder head for easier breathing. By eliminating the pushrods and lifters, the fuel injection and valve operating system are stiffened and simple. This results in precise control of injection and valve events. The injector plunger is mechanically actuated by the cam/rocker arm mechanism and generate up to 28,000 PSI injection pressure. |
| Short Port Configuration |
| The intake and exhaust port configuration of the Series 50 provide very short unobstructed intake and exhaust ports for efficient air flow, low pumping losses, and reduced heat transfer, allowing the engine to breathe more freely and run cooler. The four valves per cylinder are located 90 degrees from what is seen on traditional engines. |
| Air-to Air Charge Cooling System |
| To assist fuel economy and exhaust emissions, the Series 50 has been designed to use air-to-air charge cooling. Air-to-air offers fuel economy gains of 2-5% over traditional air intake cooling systems. Incoming air is compressed by the turbocharger and directed to a finned heat exchanger in front of the vehicle's radiator. The heat exchanger uses no liquid coolant but relies on ram air flow for cooling the charge air. This results in lowering air intake temperatures from approximately 300F (149C) to below 100F (38C). This air cooler aids in combustion and thereby increasing fuel economy. |
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| New Technology |
| Top Liner Cooling |
| The Series 50 features the patented top liner cooling. This has been accomplished by machining a coolant channel high up in the block, so that the top of the liner is surrounded by coolant, resulting in longer ring life. |
| Ceramic Injector Rollers |
| The cam follower roller in the Series 50 injector rocker arm is made of silicon nitride. The low wear properties of this ceramic makes it possible to operate at very high injection pressures while maintaining long life of the roller. High injection pressure is one way Detroit Diesel is able to meet the stringent particulate and smoke emission standards without exhaust after treatments. |
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| Counter Rotating Balance Shafts |
| The Series 50 engine has counterrotating balance shafts which make it run smooth. The balance mechanism is gear driven and is attached to the underside of the engine inside the oil pan. With the balance shafts, the Series 50 runs as smooth as the six cylinder Series 60 engine. |
| Turbocharger With Ceramic Turbine Wheel and Pulse Recovery Exhaust Manifold |
| The Series 50 engine has a pulse recovery exhaust manifold which improves turbocharger efficiency at low engine speeds. Pressure waves are generated in the manifold by the exhaust gas rushing past the valves as they open. The length of these passages are tuned to create a response within the manifold. This directs the pressure waves to the turbine wheel where some of the kinetic energy is recovered. The lower inertia ceramic turbine wheel is used to provide a more responsive turbocharger for faster response and higher performance. |
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