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).
The investigation of the engine oiling system and cooling efficiency after testing a Pott's oil cooler.
| Identifier | ExFiles\Box 1\4\ B001_X 100a-page221 | |
| Date | 16th February 1933 | |
| Y4057 E R9 To Hs.{Lord Ernest Hives - Chair} From GWH.{George W. Hancock - Head Chateauroux} Hotel de France, Chateauroux, France. 16.2.33. 3 PER. 11. We fitted the Pott's oil cooler to obtain data only and with no intention of keeping it on. We kept on for two days to obtain reliable figures. It has since been taken off. We have done a tremendous amont of investigation work on the oiling system. In the first place we satisfied ourselves on the height of the baffle plates in the bottom half to prevent the oil swishing forward and coming out of the front. The baffles had to be increased in height, the measurement being 2 1/8" from the face of the bottom half. The feed holes in the baffles to let the oil return are, rear baffle 3/4, front baffle approximately 1 1/16". Having satisfied ourselves upon this point the next problem was the pump was taking the oil out of the rear compartment faster than it could return. We found that the release oil was greater in quantity than what the present conduits could deal with, i.e. camshaft casing and the front drive. The release hole in the camshaft drains the oil into the front compartment, which is wrong. To keep the rear compartment full of oil and release some of the quantity of excess oil we fitted a pipe in the pump drive housing which is connected to the release from the pump. We found that this pipe was not releasing sufficient. We therefore have discontinued its use and have fitted a pipe to the bottom of the release unit and taken it to the rear compartment. With this we are obtaining more satisfactory results. The rear compartment is being maintained 3/4 full of oil, that is we are now maintaining 3/4 of our oil in the bottom half. There is still sufficient oil going to the camshaft etc. Having obtained this result it means now we get at the efficiency of the bottom half as a cooler. The pump is circulating 1/3 round the engine and the remaining 2/3 is being circulated through the bottom half. We find that the cooling efficiency of the bottom half is not sufficient, our temperatures still reaches 107°c air temp. -1°c. therefore it remains now to get a better efficiency of cooling from the design of the lower half. We shall try the effect of reducing the oil pressure. We have received your telegram. "rlease arrange to send Daily Reports on 19 EX similar to peregrine. hives" We will do so in future. GWH.{George W. Hancock - Head Chateauroux} | ||