Are Inhibited Oils Unnecessary ?
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THE use of detergent oils in a well' designed oil engine was unnecessary, said Mr. H. N. Tuff, general manager of the West Yorkshire Road Car Co., Ltd., in an address to the North-Eastern Centre of the Institution of Mechanical Engineers (Automobile Division), at Leeds, last week. Figures he • had obtained from a supplier of oil fuel showed that the sulphur content was from 0.4 per' cent. to 1 per cent.
It was evident, he said,that sulphur content had .not sofar reached proportions which warranted the additionof a corrosion inhibitor to lubricating oils. The only feature Which Mr. Tuff saw in such oils was that they kept the internal parts of an engine much cleaner.
He saw no Objection td-the deposition of sludge ,on the crankcase sides and on .titeueidersides.of pistons,
Mr Tuff's. view vas that ring sticking conneetedewkth .pisLon and ;cylinder
design. Freottenye, the „tronble...:.Was caused by incorrect tolerances: In 'the early stage of operation of an engine, a slight burr could " rub Over" the corner of the piston-ring slots and thus fix the rings. Gumming-up of the ring and the back of the ring kvas generally an effect rather than a cause.
He suggested that operators should insist on an engine design which did not call for the use of lubricating oils containing inhibitors.
In commenting on Mr. Tuff's paper. Mr. H. Stillman, of Edward Joy and Sons, Ltd., agreed that the sulphurcontent figures mentioned were about standard. But, he added, a figure above 0.5 per cent. caused a. tendency towards corrosion in certain engines, and this could be off-set by a heavy-duly oil. Mr. Stillman referred to oil engines which had failed because the carbon became So solid inThe oilways that oil circulation had beenprevented. This would not have happened had a detergent oil been used.
Mr. J. L. He'Pworth, of Hepworth and Grandage, Ltd., Said that '.he had evidence that not only did a high-grade heavai-duty oil keep engines cleaner, but
1-,:duced ring and cylinder wear. "I have not yet seen any Diesel that will run 50,000 miles on straight oil without the scraper rings becoming choked," he added.