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 under-bonnet temperatures for model 19-G-IV on the road with a plain bonnet fitted.
| Identifier | ExFiles\Box 102\6\ scan0142 | |
| Date | 11th October 1932 | |
| To HS{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer} X5260. 11.10.32. Tests to ascertain temperature under the bonnet on 19-G-IV on road. Plain bonnet fitted. ---------- 1st Test. Thermometer placed under bonnet on O.S. of engine between the two S.U. carburetters. Also a second thermometer fitted into the top water pipe from the cylinder head to the radiator. Average road speed 31.4 m.p.h. Time. Water Temp oC. Air Temp. oC Under bonnet. Atmos. Temp oC. 1 min. 27 16 10 2 " 26 17 10 3 " 30 17 10 4 " 34 18 10 5 " 40 20 10 6 " 46 22 9.5 7 " 54 25 9.5 8 " 60 28 9.5 9 " 65 30 10 10 " 70 32 10 11 " 74 34 10 12 " 73 36 10.5 13 " 69 34 10.5 14 " 67 35 10.5 15 " 68 36 10.5 16 " 70 38 10.5 17 " 71 39 10.5 18 " 69 39 11 | ||