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).
Recommended anti-freezing solutions and application procedures for the 40/50 and 20 HP models.
| Identifier | ExFiles\Box 151\3\ scan0121 | |
| Date | 21th December 1929 | |
| X1435 To: Wm. For Depot Sheet. From Hs{Lord Ernest Hives - Chair}/m.{Mr Moon / Mr Moore} Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}1/MJ.21.12.29. ANTI-FREEZING SOLUTIONS. At the present time the only anti-freezing solution recommended in the instruction book is de-natured alcohol. The disadvantage of this liquid is that it evaporates and so the protection is neither permanent nor constant. Two liquids that are not subject to this disadvantage are Glycerine and Ethylene Glycol. Attached is a chart shewing the protection which various percentages of these solutions give against frost. The water capacity of the 40/50 is approx 7½ galls. the 20 HP. 4 galls. Therefore a 30% solution for the 40/50 is 2¼ galls of anti-freezing added to the system and 1¼ for the 20 HP. and this should give immunity from freezing under all normal conditions in England. We recommend that when the solution the water system should be drained. The Glycerine or Glycol should then be thoroughly mixed with an equal quantity of water before being introduced into the radiator. The reason for this is that the undiluted liquids are likely to loosen scale from the inside of the cyl. blocks which may eventually cause obstruction in the radiator. The rubber joints should be carefully examined before filling with anti-freezing solution and if perished replaced, as Glycerine has a searching action which is likely to open cracks in perished rubber. | ||