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).
Investigation into the cause and remedy for excessive engine cooling water loss on the S.S. Chassis.
| Identifier | ExFiles\Box 15\1\ Scan092 | |
| Date | 17th April 1929 | |
| x7250 To R.{Sir Henry Royce} from Hs{Lord Ernest Hives - Chair}/AJL. c. to SG.{Arthur F. Sidgreaves - MD} Wor.{Arthur Wormald - General Works Manager} c. to E.{Mr Elliott - Chief Engineer} DA.{Bernard Day - Chassis Design} c. to BY.{R.W. Bailey - Chief Engineer} Hs{Lord Ernest Hives - Chair}/ AJL1/LG17.4.29. S.S. CHASSIS. LOSS OF ENGINE COOLING WATER. Reports have been received from France of excessive loss of engine cooling water during 10,000 miles test runs. Investigations and tests have indicated that the cause of this trouble is traceable to the position of the overflow pipes relative to the stream of water from the two horizontal slots in the radiator 'inflow' pipe. The overflow pipes as at present fitted (indicated by dotted lines on attached sketch) are positioned horizontally in line with the slots in the 'inflow' pipe. The water flowing from these slots at high engine speeds impinges against the overflow pipes and is deflected upwards into the radiator filler, striking the cap and a considerable quantity of it falling down the overflow pipes and so being lost. The larger size of the filler and cap relative to the Phantom radiator is an additional factor. The remedy is to alter the shaft of the overflow pipes so that they are well above a horizontal line joining the top of the slots in the 'inflow' pipe and extending across the radiator. This is more easily accomplished by fixing the overflow pipes to the rear of the filler instead of to the front as at present. In connection with the fitting of these pipes it is recommended that they should be fitted similarly contd :- | ||