The mistake with increasing your engine speed

Posted on September 12, 2017 in Highlighted, Knowledge Base, News | Comments Off on The mistake with increasing your engine speed

Last week one of our engineers returned from a site, having finished a service on a Cummins driven generator.

And whilst he was there, he was asked to assist with some monthly tests on the Dorman driven fire pumps.

There was a problem.

One of the pump engines was shutting off before it got to full speed.

Our engineer asked a few questions about the history of the engine, and it turned out that the speed had been raised from 1,500RPM to 1,550RPM.

Raising the speed of an engine without a full understanding of the engine set-up is a dangerous thing.

Whilst the electric overspeed device’s limit had been increased to take into account the latest engine speed, this hadn’t happened with the mechanical/hydraulic trip.

The result?  The air flaps were engaging before the engine could get to full speed, and that was starving the engine of air.

Once we’d worked that out, it was a relatively simple adjustment that meant the engine could run at its new speed, whilst still being protected if it started overspeeding.

If you ever want to adjust the speed of your engine, it’s vital to take all the elements into account before you do.

And if you go ahead and do it, please ensure that all the supporting devices are altered to – it’ll save you some time and money!

In light of this experience, we’re currently in the process of putting together a recommended testing procedure to help people test their overspeed devices.

If you would be interested in this, please let us know on 01206 791552 or email us

Don't miss out, fill in your details below to receive our latest news as it's posted directly to your inbox. No spam, our content is written by our engineers for engineers.

* indicates required field

By using and browsing the Bartech Marine Engineering website, you consent to cookies being used in accordance with our policy. If you do not consent, you must disable cookies or refrain from using the site.