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).
Complaints and solutions for choked radiators.
| Identifier | ExFiles\Box 15\1\ Scan127 | |
| Date | 26th July 1929 | |
| To R.{Sir Henry Royce} from HS{Lord Ernest Hives - Chair}/RM.{William Robotham - Chief Engineer} C. to SS.{S. Smith} WoF. C. to E.{Mr Elliott - Chief Engineer} DE. C. to SY. X7250 Hs{Lord Ernest Hives - Chair}/RM{William Robotham - Chief Engineer}/MJ. 26.7.29. X7250 x766 RADIATORS. ---------- We have received several complaints of Radiators becoming choked in service. These are almost exclusively confined to 7.2 B series cars onwards. We do not think that the Aluminium head is altogether responsible for the trouble because we have run Expl. car 14-EX 29,000 miles with radiator tubes 4.75" long and have had no trouble. With regard to the 4.25" long tubes which were brought in with 7.2 B series and the Aluminium head, we have run 12-EX Expl. car 25,000 miles in 7.2 B series condition without any trouble. Expl. car 10-KX after 40,000 miles has shewn signs of radiator res triction. Therefore while we have reproduced the trouble that is occuring in service, we have only done so after a big mileage. We have done a lot of investigation work and the best solution of the trouble appears to be to increase the gap between the tubes from 1 m.m. to 1 1/2 m.m. for 7.2 B series replacements and for S.S. radiators. It is re-assuring to note that 21-EX has just completed 7,000 miles in the hottest weather in France without giving the least trouble. This car had 1 m.m. gap between the tubes. We have an S.S. car running about with a 1 1/2 m.m. | ||