ENGINE COLD TEST

Cold Test Bench for Engines

Test every engine without firing it. An active dynamometer drives the engine through a defined speed profile while torque, oil pressure, temperatures and fuel injection are measured, and the TRex software turns every run into an automatic engine condition report.

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What the cold test measures

A cold test runs the engine without combustion. Because no fuel is burned, faults that would normally only show up on a firing test bench, or later in the vehicle, are found in a short, clean and safe test cycle.

The same bench serves overhaul lines and end-of-line testing. Each engine is compared against reference runs, so the result is a clear pass or fail with the reason behind it.

-Compression balance between cylinders, read from the torque signal
-Friction: drag torque at each speed step
-Oil pressure build-up time and oil pump regulation
-Fuel injection test with test fluid: injection pressure and injector function
-Run-in behaviour and repeatability between runs
-Leak, temperature and limit checks throughout the test

What a Cold Test Bench from GT General Test includes

We design and build the dynamometer, the conditioning units and the control software ourselves, and we deliver the bench under single-source responsibility. The bench is adapted to your engine family with an intermediate frame and fixtures for each engine type, for all engine types and sizes.

-Active dynamometer with drive, shafts and rotating accessories
-Main frame, intermediate frame and fixtures for each engine type
-Oil heating and automatic filling unit
-Engine coolant conditioning unit
-Fuel supply unit for the injection test (test fluid)
-Sensor set: torque, speed, oil pressure, temperatures, injection pressure
-Emergency stop system with watchdog
-TRex control unit: automatic test run, limit monitoring and reporting

Cold Test Bench for Engines — GT General Test

Why cold test

No combustion, no exhaust

No fuel is burned and no exhaust extraction or fuel-rated test cell is needed. The bench can stand on the production or overhaul floor.

Short cycle

A full speed profile with measurements takes minutes, which suits every engine on a line, not only samples.

Faults found early

Assembly and overhaul faults are caught before the engine is fitted, when fixing them is cheapest.

Automatic report

Every run ends with a report that states the engine condition: compression, friction, oil pump and injection.

Frequently asked questions — engine cold test

What is an engine cold test?

An engine cold test (motored test) drives the engine with an external machine instead of running it on its own fuel. Torque, pressures and temperatures measured at defined speeds reveal the mechanical condition of the engine without combustion.

Which engines can be tested?

All engine types and sizes. The dynamometer is sized to the engine and each engine type gets its own intermediate frame and fixtures, so one bench can serve a whole engine family.

Can the fuel injection system be tested without combustion?

Yes. The fuel system is supplied with test fluid instead of fuel, and injection pressure and injector function are measured during the cold test.

What does the test report contain?

The measured values at each speed step and an engine condition assessment: compression balance, friction, oil pump behaviour and injection, each compared with the reference runs and limits.