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).
Water flow, overheating issues, and capacities of different radiator types.
| Identifier | ExFiles\Box 66a\4\ scan0264 | |
| Date | 17th January 1928 | |
| 48250 17-1-28. Water Flow Through Radiators. Attached are curves showing the water flow through various types of radiator (R.R.). The curve (A) for the standard radiator was obtained from 44.P.H some little time ago. The remaining curves were taken on 10EX, the radiators being those made for the E.A.C.XIV sports cars. The flow was measured by using a venturi-meter in the bottom water pipe. The curve D is for the radiator which was on 10EX and which has caused over-heating trouble recently. The obstruction in the radiator comprised of cylinder scale etc combined with oil or other fatty substance to form a thick slime in the upper rows of radiator tubes. This trouble is met with by the Repair Dep't. fairly frequently, and a special substance is used to remove the obstruction without corroding the tubes. This trouble of course will be more apparent if the 6.25 mm dia: tubes are used instead of 7mm tubes, the water space between the tubes being slightly less. Water capacities of the three types of radiator are as below:- A.{Mr Adams} Standard Radiator - 4 Galls 2.5 pints B. Radiator with 6.25 mm tubes 4.250" long - 3 Galls 3.75" C. " " 7 mm " 4.250" long - 4 Galls 1 pint. N.B. Radiator C is .500" higher than A or B is/ S.ffidney | ||