Remarkable Tests of New Oil Additive
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1.-NN Monday, United Lubricants, Ltd.,
Comleys Wharf, Townmead Road, London, S.W.6, introduced a new product known as Carburol Super. When added to lubricating oil it gives it qualities which appear to be extraordinary.
The recommended addition is from 10-25 per cent., but from tests witnessed by the technical editor of The Commercial Motor it would seem that, in practice. the quantity could be safely reduced.
A hardened-steel wheel, driven by an electric motor was brought to bear on a bearing roller, pressure being manually applied through a lever fitted with a torque recorder. Tests carried out with numerous types of nonadditive lubricating oil produced somewhat similar results in that 80 p.s.i, pressure, sustained for 20 seconds, resulted in the roller bearing being badly Worn. Increasing the pressure to 100 p.s.i. caused seizure, the motor overrunning the roller shaft through belt slip.
Using an ammeter as a comparator only, and not for a true current reading, it showed 1.2 amp, when running light and 2 amp, just before the motor stalled.
With the addition of the tiniest portion of Carburol Super to a highgrade lubricant no wear could be produced on the bearing after 20 seconds at 100 p.s.i. pressure. A typical example of seizure pressure was 600 p.s.i., the running current, as recorded on the meter, showing a rise of only 0.1 amp. before seizure, as against 0.8 amp. without the additive.
After numerous tests with accepted lubricants, excellent results were obtained with water and even with tetraethylchloride, the proportions of Carburol Super being incredibly small A final test was made with a mixture of dilute sulphuric acid, a high-grade lubricant and a few drops of the addi live. The figures obtained were comparable with those recorded for the other additive tests. Some of the physical properties of the additive are that it resists acids, is miscible in water, benzine, ether, and most other liquids, and is non-corrosive.
Its freezing point is -28° C. and it is non-inflammable. The concentrate, which is entirely British, is known as Dextrol 905, which sells at 35s. per gal. The price of Carburol Super, containing Dextrol 905, is 22s. 11d. in 1-gal. tins.