From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Test report on Wakefield's Special E.P. oil, specifically manufactured for use on American cars.
| Identifier | ExFiles\Box 145\3\ scan0133 | |
| Date | 15th April 1937 | |
| REPORT ON TEST No. 763.B. TEST ON WAKEFIELD'S SPECIAL E.P. OIL SPECIALLY MANUFACTURED FOR USE ON AMERICAN CARS: OBJECT OF TEST: To try out this particular extreme pressure lubricant and note the effect on the test bearing. Refer to Test Reports Nos. 753.B. 1 - 8 inclusive, on other E.P. oils, and particularly Supplementary Report No. 753.B. (3). BEARING: SMJS.1.7/8". LOAD: 700 lbs. Journal. 1420 lbs. Thrust. SPEED: 4500 r.p.m. DURATION: 250 hours. LUBRICATION: Wakefield's Special E.P. oil specially manufactured for use on American cars. Drip feed - rate of feed 6 to 8 drops per minute - oil level to centre of bottom ball. MAX. TEMP. RISE: 92°F.{Mr Friese} NORMAL TEMP. RISE: 87°F.{Mr Friese} SHOP TEMP: 71°F.{Mr Friese} GENERAL REMARKS: Referring to Supplementary Report on Test No. 753.B.(3) it will be seen that this oil has been submitted to a bearing submersion test and found to be satisfactory from the point of view of staining. Later it was decided to give a running test, but as we had not sufficient oil to use in the pump system a drip feed lubricator was used in connection with the loading bearing on the E.P. oil test rig. (T.R.15.B.) The combined loads as applied were on the high side for the speed of 4500 r.p.m. but no evidence of overload was apparent on the balls or tracks. There were however considerable signs of staining on the balls, inner, outer and cage, this having the appearance of a black gunmetal covering. The temperatures encountered were not considered to be unduly high but in spite of this fact the oil had carbonised, and a thick deposit of soft carbonaceous matter was to be seen over the component parts of the bearing, particularly the outer race. This carbon, had the run continued, would undoubtedly have had a deleterious effect on the bearing. The oil after use had thickened up slightly and contained particles of carbon but no chemical analysis has been made. CONCLUSIONS: In view of the tendency of this oil to carbonise we could not make any recommendations for its use as a lubricant where our products are concerned. | ||