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  • Hatz Diesel 4H50TIC: Compact Performance

Hatz Diesel 4H50TIC: Compact Performance

Compact Performance

John Lehenbauer
Aug 7, 2017
Photographers: Courtesy of Manufacturer
The increasing demand for diesel engines to provide exceptional performance while meeting higher emissions standards is pushing engine development in new directions. Manufacturers must continually implement innovative designs and ideas in order to remain viable in the ever-evolving industry.
When Hatz Diesel started working on its H-Series engine, designers determined a new perspective was needed for the development. So they decided to take a new downsizing approach for building the powerplant. With this new strategy, the company’s goal was to produce an engine that makes good power, has high fuel efficiency, emits fewer emissions, and is smaller and lighter than other engines in its class. The first engine to come from this line of thinking is the 4H50TIC.
The turbocharged, common-rail, 2.0L I-4 industrial diesel engine is able to produce 75 hp and 177 lb-ft of torque while only weighing 381 pounds. The 4H50TIC’s power-to-weight ratio set a new standard for engines in its class.
Photo 2/3   |   Looking down on the Hatz Diesel 4H50TIC engine, the Bosch off-highway, common-rail fuel system sits prominently on top. The high-pressure fuel pump provides 1,800 bar of pressure to the injectors, which make three injections per power stroke.
Building a versatile engine that can accomplish many different tasks requires several qualities to work together. Of course, internal efficiency is a key to lower emissions and increased fuel economy. To achieve this, Hatz reduced the friction of internal components by using fewer, more specialized parts, like an aluminum cylinder head. With only two valves per cylinder, there are fewer springs, pushrods, and valve tappets to create internal drag and weight. Valvetrain friction is reduced further with hydraulic-roller tappets on a geardriven camshaft mounted low in the engine. The cam’s low position reduces installation space and makes the block more compact. Bearing materials chosen for the engine are high-quality, ensuring longevity and precise, smooth operation.
Fuel is delivered by a Bosch off-highway common-rail that maintains a pressure of 1,800 bar (a first for an industrial diesel) in three calculated injections. The pre-, main-, and post-injection events are delivered during the engine’s power stroke. Working with a matched Bosch high-pressure pump, injection control unit, and off-highway injectors, the common-rail makes precise fuel deliveries that provide a balance between durability, quiet combustion noise, and excellent emissions values. The ability to accurately control fuel allows optimum operation during a broad load and speed range.
The engineers at Hatz spent a great deal of time developing the 4H50TIC’s exhaust gas recirculation system . A pre-cooling unit is used to reduce the temperature of the exhaust gas upstream of the EGR. This protects the system from suffering thermal damage that might hinder its effectiveness. After it passes through the EGR, the exhaust enters a mixing nozzle that uniformly blends the gases with fresh combustion air; the mix is then evenly distributed to all four cylinders. Working in conjunction with the common-rail fuel system and the wastegate turbocharger, the system operates at a highly efficient level.
The combination of technologies allows the engine to meet EPA Tier IV final emissions standards with only an oxidation catalytic converter. With no need for a particulate filter, the engine’s size, weight, and complexity are reduced.
The 4H50TIC has a 500-hour service interval, and its innovative design makes the powerplant suitable for use in a broad range of applications.
Photo 3/3   |   A wastegated turbocharger mounts to the back of the aluminum cylinder head, which has an integrated exhaust manifold. The oxidation catalytic converter comes directly off the turbo.

SPECIFICATIONS

Engine: Hatz 4H50TIC
Displacement: 1.95L (119 ci)
Engine Layout: I-4
Valvetrain: 8 valves
Bore x Stroke: 3.31 x 3.46 inches (84 x 88 mm)
Compression Ratio: 17.5:1
Head material: Cast aluminum
Block material: Gray cast iron
Piston material: Aluminum
Power: 75 hp
Torque: 177 lb-ft
Emissions: EPA Tier IV
Induction: Single turbocharger
Exhaust: Integrated with the cylinder head
Intercooler: Air-to-air
Cooling System: Liquid-cooled
Fuel System: High-pressure, common-rail
Lubrication System: Wet sump
Lubrication Capacity: 7.4 quarts
Dry Weight: 381 pounds
Length: 29.25 inches
Width: 24.76 inches
Height: 25.63 inches

Sources

Hatz Diesel
hatz-diesel.com
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