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).
Radiator core developments, comparing efficiencies and design modifications between different manufacturers.
| Identifier | ExFiles\Box 173\1\ img226 | |
| Date | 19th January 1934 guessed | |
| 2 They are making over 4000 Chevrolet radiators a day. On this production saving a cent per radiator represents 10,000 dollars a year. RADIATOR CORES: The radiator matrices that Marstons are now producing for us are today 20% less efficient than the existing standard Harrison core. The core is of the same type, but the efficiency has been stepped up in two ways: (1) Instead of dents in the indirect cooling strips they now put louvres. These are more effective in dissipating the stagnant layer of air than the dents increasing the efficiency 10%. We should be able to get Marstons to modify their tools to produce this alteration. (2) They have increased the density of the matrix from 8 indirect fins /1" to 10 fins/1" i.e. Old Matrix - [Drawing of 'Old Matrix' with dimensions 40 and 25] [Drawing of 'New Matrix' with dimensions 55, 20 and a count of 4] This improves matters a further 10%. They have various other developments in hand, particulars of which they showed me, but these have not yet reached a production stage. We can have the Harrison water passage strip in any thickness we like up to .009 so we ought to be far better for leaks than previously. The indirect strip, of course, remains at .004 for lightness. Their new water-way is .085 wide, giving almost certain immunity from any form of choking up, and reducing the possibility of cavitation on the suction side of the pump. They have developed a vibration test for radiators. Four years ago no radiator made by G.M., would last more than 5 mins 7 | ||