A balanced engine is key to an efficient and sustainable operation

REDS, Aviso's engine measurement instrument, indicates whether an engine operates in a balanced state. The system signalizes imbalance and functional deviations and shows what the source of the problem is. When the imbalance in the engine is restored it can continue operating in its most efficient and effective state. By continuously monitoring and restoring the engine's balance, excessive wear and tear, component failure and engine breakdown are prevented. 

REDS measures three types of imbalance

1. Imbalance of moving parts, mechanical imbalance

Due to the presence of the number of reciprocating parts, like piston, connecting rod, etc. which move once in one direction and then in another direction, vibration develops during operation of the engine. Excessive vibration occurs if the engine is unbalanced. The vibration may be caused due to design factors or may result from poor maintenance of the engine.

2. Imbalance due to combustion and expanding gasses

An engine is powered by the power stroke (acceleration of the crankshaft). There are different moments in the revolution of the crankshaft that create de-acceleration, for example the compression stroke or delays created as a result of the intake stroke. The accelerations and de-accelerations should be the same for all cylinders. This way the power contribution of each individual cylinder is equal and the engine runs in a balanced state.

3. Imbalance of external components

The accelerations and de-accelerations of the crankshaft are also influenced by ‘external’ components, not located in the engine but connected to the crankshaft. For example, a damaged propeller blade or a not optimally functional torsional vibration damper.


The monitoring of reciprocal machinery such as combustion engines is difficult. Aviso Instruments developed a system that is non-invasive and gives detailed information about the status of the engine and its components. We monitor the torsional vibrations within the engine, whereas other engine monitoring systems only measure the engine's output like temperature, gas and pressure. When these output indicators change it means something already is defect. Whereas with REDS Maritime even the smallest deviations are detected up to 20 days in advance. This enables its users to take action to prevent damages and carry out condition based maintenance. 

Do you want to:

  • Optimize your maintenance operation?
  • Cut back significantly on fuel costs?
  • Reduce your carbon footprint?
  • Improve your ship availability?

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In this video Eric explains how REDS Maritime distinguishes itself from traditional engine monitoring systems.