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Hance hydraulic dynamometers cover a power testing range from 40 kW to 6,700 kW, making them suitable for testing both diesel and gasoline engines. Their unique operating principles and structural design enable high-power dynamometers to accurately test low-power engines—down to just 5% of their rated capacity—effectively allowing a single unit to perform the work of multiple machines. This makes them particularly well-suited to meet the specific needs of the engine repair industry and multi-variety production testing environments.
Hydraulic Dynamometers & Test Cell Auxiliary Equipment
Hance hydraulic dynamometers deliver 35 kW to 10,000 kW of power absorption across the HDX and HDL series. The HDX platform accurately tests engines down to 5% of rated capacity, while the HDL series handles high-torque, low-speed diesel engines up to 10,000 HP. Matched couplings, fuel coolers and exhaust silencers complete a durable test-cell package.
35–10,000 kW
Power testing range (HDX + HDL)
HDX / HDL
Series for every duty
1,000+
Units in global service
Heavy-duty components and a modular stator–rotor design support a legendary service life.
Why Hance hydraulic dynamometers?
One dynamometer, the working range of several machines
The HDX series shares a common structural design and scales power absorption by adding stator and rotor assemblies. The HDL series extends into very high torque territory with a through-shaft design that accepts either-end drive or tandem dynamometers. Both series deliver low-inertia, high-absorption performance for continuous-duty engine power verification, quality assurance, endurance and certification testing.
01 / WIDE TEST RANGE
Accurate testing down to 5% of rating
High-power HDX dynamometers can precisely test low-power engines without switching to a smaller absorber, reducing the number of units required on the floor.
02 / MODULAR CAPACITY
Add stator–rotor assemblies to scale
The HDX platform lets one structural design cover a wide power band by adding internal absorption elements, simplifying spares and service.
03 / THROUGH-SHAFT DESIGN
Drive from either end, or tandem up
HDL dynamometers feature a through-shaft design that allows either end to be driven, accepts tandem dynamometers and supports accessory mounting including starting systems.
04 / BI-DIRECTIONAL
Equal absorption in both directions
HDX and HDL series dynamometers operate in both clockwise and counter-clockwise directions with equal absorption capability, accommodating different engine orientations.
Hydraulic absorption principle
How a water-brake dynamometer absorbs engine power
A hydraulic dynamometer converts engine output into heat through the interaction of water and rotating elements. Water flows through the inlet manifold, is accelerated outward by the rotor and decelerated in stator pockets. This continuous acceleration/deceleration creates the load. The absorbed power is measured from reaction torque on the trunnion-mounted stator housing, while cooling water removes the generated heat.
01
Engine drives the rotor
The engine crankshaft is coupled to the dynamometer rotor. Rotational energy enters the water brake through the drive shaft and coupling assembly.
02
Water creates hydraulic resistance
Metered inlet manifolds direct water at the center of each rotor. Centrifugal force drives the water outward into stator pockets, where deceleration generates the absorption load.
03
Reaction torque is measured
The stator housing is mounted on trunnion bearings. The reaction torque it experiences is transmitted to a torque sensor with linkage and converted into horsepower. A speed sensor with gear assembly captures RPM.
04
Cooling water removes heat
Continuous water flow carries away the absorbed energy. Sufficient internal clearance eliminates the need for separate cooling water, and water flow requirement for loading is typically less than 6 GPM per 100 HP of applied load.
Product structure
HDX series dimensional layout
The HDX water-brake dynamometer features a trunnion-mounted, fixed-base design with cast iron rotors and stators. The dimensional drawing below shows the overall envelope (A), base footprint (B, C) and shaft centerline dimensions (D through J) for installation planning.
HDX Series — External Dimensions
Dimensions in inches
Refer to the dimensional table in the HDX power & torque curve document for complete A–J dimensions across HDX2000 through HDX4000 models. Other centerline heights available upon request.
Series overview — HDX
HDX hydraulic dynamometer models
The HDX series comprises 12 distinct models sharing a common structural design. Power absorption capacity is increased by adding stator and rotor assemblies. Designed for truck, off-highway, military and mining engine testing, HDX dynamometers operate in both clockwise and counter-clockwise directions.
HDX Series — Dimensions, Weight & Inertia
Scroll horizontally on small screens
Model
Part #
Dimensions (inches)
Weight (lbs)
Inertia (lb-ft²)
A
B
C
HDX2000
5232 1/2
35 1/4
—
—
2,690
195.4
HDX2300
5535 1/2
38 1/4
—
—
2,960
227.8
HDX2700
5838 1/2
41 1/4
12 1/2
15
3,230
260.1
HDX3000
6141 1/4
44 1/4
—
—
3,500
292.4
HDX4000
6444 1/4
47 1/4
—
—
3,770
324.7
HDX Series — Rated Power & Peak Torque
Power at 2,000–4,000 RPM
Model
Rated Power (HP)
Peak Torque (ft-lbs)
Peak Torque RPM
HDX2000
2,700
9,265
1,500
HDX2300
3,150
10,809
1,500
HDX2700
3,600
12,353
1,500
HDX3000
4,050
13,897
1,500
HDX4000
4,500
15,000
1,500
Power rises with engine speed and becomes constant from approximately 2,000 RPM through 4,000 RPM. Torque peaks around 1,200–1,500 RPM and decreases at higher speeds, consistent with constant-power absorption.
Series overview — HDL
HDL high-torque dynamometer models
The HDL series is designed for testing high-torque, low-speed diesel engines in mining, marine, construction and power generation. Application power ranges through 8,000 HP (5,968 kW) at speeds up to 2,500 RPM and torque up to 45,000 lb-ft (61,011 Nm). These trunnion-mounted, fixed-base dynamometers feature a through-shaft design and fabricated steel sub-base.
HDL Series — Dimensions, Weight & Inertia
Scroll horizontally on small screens
Model
Dimensions (inches)
Weight (lbs)
Inertia (lb-ft²)
A
B
C
HDL1200
56 1/4
49
43 1/4
8,750
411
HDL2400
62 7/8
57 3/4
52
10,500
799
HDL3600
69 1/2
66 1/2
60 3/4
12,250
1,187
HDL4800
76 1/8
75 1/4
69 1/2
14,000
1,575
HDL6000
84 3/4
84
78 1/4
15,750
1,963
HDL10000
84 3/4
84
78 1/4
15,750
1,963
HDL Series — Rated Power & Peak Torque
HP (kW) and lb-ft (Nm)
Model
Rated Power
Peak Torque
Peak Torque RPM
HDL1200
1,600 HP (1,194 kW)
9,337 lb-ft (12,664 Nm)
900
HDL2400
3,200 HP (2,387 kW)
18,674 lb-ft (25,329 Nm)
900
HDL3600
4,800 HP (3,581 kW)
28,011 lb-ft (37,993 Nm)
900
HDL4800
6,400 HP (4,774 kW)
37,348 lb-ft (50,658 Nm)
900
HDL6000
8,000 HP (5,968 kW)
46,684 lb-ft (63,322 Nm)
900
HDL10000
13,404 HP (10,000 kW)
67,050 lb-ft (90,900 Nm)
1,200
HDL6000 and HDL10000 share the same physical envelope but differ in absorption capacity. HDL10000 reaches its rated power at 1,400 RPM and maintains it through 2,500 RPM.
Engine-to-shaft connection
Coupling and flywheel adapter specifications
Accurate alignment between the engine and dynamometer is critical for vibration control and test repeatability. Hance supplies SAE-matched coupling assemblies that bolt directly to common engine flywheel patterns. HDL models include a 315 series drive shaft companion flange as standard.
Coupling assemblies include the flywheel adapter plate and drive coupler. Proper pilot engagement ensures concentric alignment without trial-and-error shimming. Confirm your engine flywheel housing SAE size before ordering.
Fuel system thermal control
Diesel fuel return coolers
During dynamometer testing, returning diesel fuel carries heat from the injection system. A dedicated return cooler stabilises fuel temperature, protects the fuel system and helps maintain consistent combustion conditions across the test cycle.
Diesel Fuel Return Cooler Selection
Matched to QST and QSK engine families
Model
Technical Specifications
Application
Remark
786500
Diameter 3/4 inch, cooling area 3 m²
QST30, QSK23
786501
Diameter 1 inch, cooling area 5 m²
QSK50, QSK60
786502
Diameter 1.5 inch, cooling area 8 m²
QSK78, QSK95
Cooler selection should account for fuel flow rate, return fuel temperature and the available cooling-water temperature.
Exhaust management
Muffler and exhaust system specifications
Engine test cells require controlled exhaust routing for operator safety, acoustic comfort and consistent back-pressure. Hance mufflers are sized by inlet diameter and provide approximately 25 dB of noise reduction across the QSK and Cat engine range.
Muffler and Exhaust System Selection
25 dB nominal attenuation
Model
Technical Specifications
Application
Remark
4350.00
Diameter 150 mm, noise reduction 25 dB
QSK19/23, QST30
4351.00
Diameter 250 mm, noise reduction 25 dB
QSK50, QSK60
4352.00
Diameter 300 mm, noise reduction 25 dB
QSK78, Cat 3516
4353.00
Diameter 350 mm, noise reduction 25 dB
QSK95, Cat 3516C
4354.00
Diameter 400 mm, noise reduction 25 dB
16PA6
4354.00
Diameter 450 mm, noise reduction 25 dB
16PA6
Muffler inlet diameter should match or exceed the engine exhaust outlet. For test cells with stringent acoustic requirements, additional attenuation may be required.
Selection inputs
What determines the right dynamometer and auxiliary package?
Power rating alone does not define a complete test-cell system. These factors determine the dynamometer series, coupling arrangement, fuel cooling capacity and exhaust hardware.
Engine power and torque curve
Peak power, peak torque and the shape of the torque curve determine the minimum absorber capacity and low-speed absorption requirement.
Engine family and flywheel housing
The SAE flywheel housing size dictates which coupling adapter is required. QST and QSK families have established Hance adapter references.
Test duration and duty cycle
Continuous endurance testing demands more cooling capacity and water retention than short performance pulls. Duty cycle affects cooler and recirculation sizing.
Cooling-water availability
Once-through or recirculated cooling, inlet temperature and allowable temperature rise determine the required flow rate and heat-rejection method.
Exhaust routing and acoustic limits
Cell layout, stack height and local noise regulations influence muffler selection and whether secondary silencing is needed.
Fuel system configuration
Return fuel flow and temperature, tank location and fuel conditioning requirements determine fuel cooler model and placement.
Where Hance systems work
Engine testing applications
Hance hydraulic dynamometers and auxiliary equipment are used across engine manufacturing, remanufacturing, research and field service operations in mining, marine, construction, power generation and propulsion industries.
Typical use cases
Heavy-duty diesel engine remanufacturing
Truck, off-highway and mining engine testing
Military engine overhaul and acceptance testing
Multi-variety production test lines
Marine and power-generation engine testing
Engine repair shops with mixed engine fleets
Buyer questions
Hydraulic dynamometer FAQ
Practical answers for selecting a hydraulic dynamometer and planning the supporting test-cell systems.
What is the advantage of a hydraulic dynamometer over an eddy-current dynamometer?
Hydraulic (water-brake) dynamometers typically offer higher power density, lower inertia and greater tolerance for high-torque, low-speed operation. They are well suited to large diesel engines and applications where a compact absorber is needed.
Can one Hance dynamometer test both large and small engines?
Yes. The HDX series can accurately test engines down to approximately 5% of its rated capacity. That wide turndown allows a single dynamometer to cover a mixed engine population without switching to a smaller absorber.
How do I choose between the HDX and HDL series?
Choose HDX for medium-to-high power diesel and gasoline engines from 35 kW to 3,300 kW, especially where mixed engine populations require wide turndown. Choose HDL for high-torque, low-speed diesel engines up to 10,000 HP (7,457 kW) and 50,000 lb-ft (67,820 Nm), typical of mining, marine and power generation applications.
How do I choose the right coupling model?
Identify the engine flywheel housing SAE size. Hance coupling models are referenced to SAE1 through SAE5, with specific recommendations for QST30, QSK23, QSK50, Cat 3512 and Cat 3516 engines. Confirm the flywheel housing size before ordering.
Is a fuel return cooler always required?
It depends on the fuel system and test duration. Long-duration tests and engines with high return-fuel flow benefit from active cooling to keep fuel temperature stable. The cooler also protects fuel system components from heat-related wear.
How much noise reduction do the mufflers provide?
The standard Hance muffler range provides approximately 25 dB of attenuation. If the test cell has stricter acoustic limits, additional silencing or acoustic treatment may be required.
What water flow does a hydraulic dynamometer require?
Water flow depends on the absorbed power and allowable temperature rise. As a reference, large dynamometer cooling systems are often sized in the range of 3.5 GPM per 100 HP (approximately 19 L/min per 100 kW). Hance provides the specific flow requirement for each model.
Build a complete test cell
Related dynamometer equipment
Explore compatible Hance systems for cooling-water recirculation, engine cooling control and test-cell data acquisition.
Match the dynamometer and auxiliary package to your engine test programme
Share your engine model, flywheel housing, power rating and test-cell conditions with Hance for model selection, coupling confirmation and accessory sizing.
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