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).
Experiment No. 472 regarding the testing of valve springs tempered in an oil bath.
| Identifier | ExFiles\Box 80\3\ scan0160 | |
| Date | 31th July 1913 | |
| From Exp. Dept. Copies for: Mr Johnson. Mr Royce. Mr Elliott. Mr Nadin. 7290 Wor{Arthur Wormald - General Works Manager}/WH12/LS1713. July 31st 1913. Report on Experiment No.472 Valve Springs tempered in oil bath at Derby. These springs ran 100 hours at 2000 engine revs. with no breakages. We then ran them at 2200 engine revs., the valves were just not leaving their seats. After 10 hours of this No.7 spring broke. They ran for a further 30 hours with no more breakages. On Mr Radley's Austrian Trials car they had 3 valve springs break going from London to Vienna, it must have been the high engine speeds across France that broke them. There are a number of other makes of valve springs to test yet. | ||