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).
Engine cooling system tests, including radiator temperature, water circulation, and the American Phantom II.
| Identifier | ExFiles\Box 24\5\ Scan236 | |
| Date | 25th June 1930 | |
| -6- the tests, and ascertained that it was subjected to the correct tension. We compared the radiator temperature in this condition with the fan belt tightened choc a bloc and were surprised to note a drop in temperature of 40°C. with the greater tension (Graph (5)). The Americans use a special canvas rubber fan belt and manual tensioning, which may give them an advantage. Water Circulation. In parallel with the Brooklands tests we carried out some circulation experiments on the test bed, with the complete engine and cooling system. These tests indicate that with the present radiator we have adequate circulation until the top water temperature reaches 93°C. after which point at maximum engine speeds the delivery of the pump falls below that required for the best results. In our previous report Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}3/MJ10.1.30 we shewed that we were on the border line for this trouble, but we still consider that under ordinary road conditions, unless the matrix becomes obstructed, we are not handicapped by circulation we can undoubtedly improve matters by attention to the radiator outlet and possibly by modifying the pump. We are doing some tests on this. American Phantom II. We have carried out careful comparative tests on this car at Derby against a production chassis and find that it is normal. It is possible that while in France, it was not running under 100% conditions with regard to ignition | ||