Pump action

Excell, Jon
December 2004
Engineer (00137758);12/10/2004, Vol. 293 Issue 7665, p31
This article reports that an innovative power pump designed by the British engineers that could lead to major improvements in the energy-efficiency of the oil systems used in diesel engines. Developed by Birmingham's Concentric, the new variable flow oil pump is said to use significantly less power than conventional fixed flow pumps. Indeed, the pump has demonstrated savings for heavy-duty engines of between 3 and 4hp at rated speed and more than lhp at cruise speed. Concentric's design office manager Kevin Johanson explained that the problem with the kind of positive displacement pumps typically used is that they are completely linear. He said that the faster one run them the more one gets out of them. With the amount of oil coming out of the pump limited either by a safety release valve or pressure regulator, and the rest of the oil either recirculated within the pump or dumped straight into a pump, there's clearly room for improvement.


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