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 a B.W.P. Variable Level Oil Intake used as an oil level indicator.
| Identifier | ExFiles\Box 6\6\ 06-page021 | |
| Date | 30th November 1934 | |
| 4109 60 To E/JNR.{Charles L. Jenner} From Hs{Lord Ernest Hives - Chair}/WB.{Mr Brazier/Mr Bell} Hs{Lord Ernest Hives - Chair}/WB.{Mr Brazier/Mr Bell}12/KW.30.11.34. EX.16078 B.W.P. Variable Level Oil Intake. Tested as an oil level indicator - fitted to B-4 Unit sump. In response to memo. E/JNR.{Charles L. Jenner}1/HP.12.11.34. The lower half was fixed horizontally, and after fitting an indicator finger to the B.W.P. intake, and attaching a "fixed" indicator to the inner wall of the lower half, both were calibrated in pints. Incidentally the standard R.R. indicator was checked, and, finding a slight discrepancy, the correct markings were delibly superimposed upon the standard indicator plate for convenience during the tests - there was a maximum error of 1 pint. The three indicators were calibrated when filling up, using Motorine "C" at 20°C. The B.W.P. then rose with the increasing oil level, but later, when the sump was emptied, and then refilled whilst the oil was circulating, it rose very sluggishly, taking approximately 3 minutes to attain its maximum level, and was then reading 1 pint low. When the motor was stopped, it regained its correct level. With cold oil (20°C.) the float returned to within 1 pint of its normal position when pushed down to minimum position, and then released, whether the oil was in circulation or not, although its action was very sluggish. With hot oil (75°C) it returned to its normal position fairly quickly, pumping or stationary. When the intake was lifted to its maximum position, it returned to its normal position in each case. Tested up to a pump speed of 1200 r.p.m., the three gauges tallied throughout the range, both at 20°C. and 75°C. oil temperature, the maximum inlet depressions registered being 4.7 lbs/sq.in. at 20°C., and 3.1 lbs/sq.in. at 75°C. | ||