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Products  |  Thermal Engineering and HVAC  |  Internal Combustion Engines  |  CT 400
CT 400 Load Unit, 75kW, for 4-Cylinder Engines Show data sheet (pdf file) Print page
Technical Description

  This test stand measures the power output of internal combustion engines delivering up to 75kW. The complete test stand consists of two main elements: The CT 400 as the control and load unit and a choice of engine: CT 400.01 petrol engine or CT 400.02 diesel engine. The engine to be investigated is connected to the CT 400 using a coupling with jointed shaft.

  The main function of the CT 400 is to provide the required braking power. The brake unit is an air-cooled eddy current brake. The braking torque can be precisely adjusted using the exciting current. The braking torque is measured by means of a suspended brake unit and force sensor. Due to the air cooling of the brake, the engine test stand does not require cooling water inlet or outlet. A quietening vessel with an intake air duct for the combustion air is mounted on the frame. The quantity of air taken in is measured in the duct.

  The switch cabinet contains digital displays for the speed, torque, volumetric intake airflow and temperatures (exhaust gas, engine oil, engine cooling water (inlet and outlet), fuel and intake air). The switch cabinet pivots, enabling the operator to adjust it to the optimum viewing angle.

  Data is transferred between the CT 400 load unit and the engine via a data cable connecting the switch cabinets of the two units. The measured values can be read on digital displays. At the same time, the measured values can also be transmitted directly to a PC via USB. The data acquisition software is included.

  In addition to the standard safety features (e.g. oil pressure, temperature limiter), the load unit contains a limit switch to monitor whether the brake and the engine are correctly connected.

  The well-structured instructional material sets out the fundamentals and provides a step-by-step guide through the experiments.


Learning Objectives / Experiments

In conjunction with an engine (CT 400.01 / CT 400.02)
- Plotting of torque and power curves
- Determination of specific fuel consumption
- Determination of volumetric efficiency and lambda

  (fuel-air ratio)
- Energy balances
  * overall engine efficiency



* Control and load unit for four-cylinder diesel and
  petrol engines up to 75kW1
* Air-cooled eddy current brake with precise torque
  adjustment for use as load unit for engine1
* Easy connection of engine1
* Complete test stand set-up in conjunction with an

Available accessories
CT 159.02 -- Exhaust Gas Analysing Unit
CT 400.01 -- 4-Cylinder Petrol Engine
CT 400.02 -- 4-Cylinder Diesel Engine
CT 400.09 -- Electronic Engine Indicating System for CT 400
CT 400.16 -- Pressure Transducer and TDC Sensor for CT 400.01
CT 400.17 -- Pressure Transducer and TDC Sensor for CT 400.02
Alternative products
CT 110 -- Test Stand for Single Cylinder Engines, 7,5kW
CT 159 -- Modular Test Stand for Single Cylinder Engines, 2,2kW
CT 300 -- Engine Test Stand, 11kW
CT 400 Test Stand for 4-Cylinder Engines
[1] Load unit for prepared four-stroke diesel or petrol engines with a maximum power output of 75kW
[2] Air-cooled eddy current brake for applying load to the CT 400.01 and CT 400.02 engines
[3] Force transmission from engine to brake via rotationally elastic coupling and jointed shaft
[4] Quietening vessel for intake air approx. 220L
[5] Potentiometer for continuous adjustment of brake
[6] Potentiometer to "accelerate" engine
[7] Recording of braking power via speed and braking torque
[8] Measurement and display of engine load, air temperature, intake air consumption, speed
[9] Measured value displays for engine: temperatures (oil, exhaust gas, cooling water, fuel), oil pressure, fuel consumption (using precision scale)
[10] LabVIEW software for data acquisition via USB under Windows XP or Windows Vista
Technical Data

Eddy current brake
- max. braking torque: 200Nm
- max. speed: 6000min-1
Measuring ranges (sensors on CT 400 and engine)
- speed: 0...6000min-1
- torque: 0...240Nm
- volumetric flow 
  intake air: 0...6m/min

  cooling water: 0...50L/min
- Temperatures:  -50...200C
  Exhaust gas: 0...1200C

Dimensions and Weight
LxWxH: 1200x950x1900mm
Weight: approx. 250kg
Required for Operation
230V, 50/60Hz, 1 phase
Scope of Delivery

1 load unit
1 LabVIEW software CD + USB cable
accessories (including tools, battery charger, cables

  (data, USB), precision scales, exhaust gas hose

1 set of instructional material

Order Details

063.40000  CT 400  Load Unit, 75kW, for

                                 4-Cylinder Engines

© 2005 G.U.N.T. Gerätebau GmbH