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Claims for Centrifugal Filters

31st October 1958
Page 56
Page 56, 31st October 1958 — Claims for Centrifugal Filters
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LIVE times the life between services for I the Glacier GF.1 centrifugal oil filter as compared with pack-type paper and felt-element filters is indicated by tests carried out by the Glacier Metal Co., Ltd., Alperton, Middx, and detailed in a report by R. T. Beazley, B.Sc.(Eng.), A.M.I.Mech.E., filter development manager.

The filter was subjected to a number of comparative tests on a 100 b.h.p. oil engine with paperand felt-element filters. A special contaminant used for the testing procedure was supplied by the Motor Industry Research Association. It was prepared from actual sump drainings and filter washings and is said to be typical of the type of oil-contaminating dirt found in Great Britain.

On test, contaminant was added at a set rate to the engine oii until the packtype filters had accumulated so much dirt that oil flow was sufficiently restricted to open the by-pass valve. It is stated that at this point the centrifugal filter contained substantially more dirt than the pack filters and had about four. fifths of its dirt capacity still available.

The centrifugal model, which works on a reaction-turbine principle, was found to have removed more of the large and damaging particles of dirt from the oil than the other types, whilst it is claimed from the tests that the centrifuge removes more than 10 times the amount of dirt between services that the pack types remove in their running life.

It is also reported that centrifugal filters in service are less damaging than pack types to the additives in modern heavy-duty oils. As the dirt in the centrifuge packs on the wall of the bowl, the oil does not have to pass through a bed of dirt containing reactive metallic matter as in a pack filter.

Users have reported running periods increased by up to 50 per cent, before an oil change became imperative because of a serious drop in the additive contained in the oil.


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