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).
Letter from Harrison Radiator Corporation discussing radiator core configurations, oil cooler production, and test results.
| Identifier | ExFiles\Box 149a\3\ scan0180 | |
| Date | 18th August 1936 | |
| HARRISON RADIATOR CORPORATION LOCKPORT, NEW YORK August 18, 1936 - 5 - Enclosed please find a curve showing the heat output from the 3.3" radiator which we assume you are having built in England and dissipation results obtained by using two radiators of 2-1/8" thickness each with 1/2" space between them. A schematic drawing is also enclosed showing this arrangement and the method of obtaining waterflow through both cores. While it is true that the rear core will not dissipate as great an amount of heat as the front core, nevertheless the mixing of the water from both cores through the pump results in the same water temperature inlet to the block as if one core were used. This combination will increase the dissipation over the 3.3 radiators approximately 10 to 12% which is necessary in order to provide satisfactory cooling, and while it does increase the depth over that of a single 4" core, believe that this will be the most satisfactory manner for you to get production stock readily. We have recently supplied the Vauxhall Company of Luton, England, with machines of our latest design to manufacture .20 x .55 cores in depths of 2-1/8", 2-1/2" and 2-3/4" and believe the 2-1/8" cores will serve your purpose. We have run tests over here with 2 and 3 cores one behind the other and have conducted experiments to determine the best spacing between the first and second cores and 1/2" is the best position and if you build up such an assembly, suggest that you maintain this condition. The oil coolers which we have had in production are unfortunately not being manufactured at this time due to difficulties which we have had with our experimental furnace which we find is not suitable for mass production. We have other furnace designs under consideration, however, and expect to get going on this particular unit just as rapidly as possible. You question the use of the plate with a number of varying size holes used for water distribution on the Buick cooler and am enclosing copies of curves showing test results of these coolers with and without the distributing plates from which you may see that the distribution of the water by these plates has an advantage insofar as total dissipation is concerned. Referring again to the Phantom car, if there is any way at all in which you can supply us with critical air temperature obtained by running the car at 20, 40, 60 MPH or any one of these figures, together with the critical air temperature at the maximum speed of the car, believe we will be in a position to answer your questions more completely. HEAT TRANSFER PRODUCTS AVIATION . AUTOMOTIVE . MARINE . INDUSTRIAL RADIATORS . SHUTTERS . OIL TEMPERATURE REGULATORS . CAR HEATERS . THERMOSTATS . HEAT EXCHANGERS | ||