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).
Proposal to standardise 45° angle seats on valves to prevent them from burning.
| Identifier | ExFiles\Box 48\4\ Scan114 | |
| Date | 1st September 1923 | |
| R.R. 755 (10M) (SL 72 18-7-23) MP 274954s. (11) /4226 COMPLETED 14.9.23 STANDARDISATION of CHASSIS PARTS. Date 1.9.23. Description of Parts: 45° angle seats on valves Origin: To avoid valves burning. Experimental Test Report. We have had a number of instances of valves burning on 20 HP. cars both on experimental and customer's cars. Tests prove 45° angle seats a definite improvement. See report Hs{Lord Ernest Hives - Chair}1/LG1. 9. 23. Road Test Report. Run on Test Bench for 24 hours. Fitted to 4-G-11 and 7-Gehawk-11. This follows the practice now adopted on 40 HP. Present valves can be modified. X No. 4226 Drawing No. Part List A Scrap and replace at all costs, including Chassis already delivered to customers. B Scrap and replace on Chassis in works. C Scrap present stock and 'replace' on all Chassis not yet handed to test. D Use existing stock Alteration effective on future Chassis. Weight of Old Part. Weight of New Part. Difference per Car. £ No Change in cost. Cost of Old Part. £ Cost of New Part. £ Difference per Car. £ Cost of Parts in Works which will be scrapped if commenced on:— Series......£...... Series......£...... Series......£...... Signature of Mr. De LOOZE that above is correct. My/JW 10.9.23 SIGNATURES | DATE | REMARKS MR. JOHNSON | 13.9 | agreed CJ MR. B. JOHNSON | 13.9.23 | agreed MR. ROYCE | 5.9.23 | Agreed. FHR. Uniformly believed the 45° seat is the best, but not yet conclusive why 40/50 needs one shape of valve, and 20 HP. another. MR. WORMALD | 12.9.23 | Agreed, Wor.{Arthur Wormald - General Works Manager} MR. ROWLEDGE | 3.9.23 | Agreed, Rg.{Mr Rowledge} MR. DAY | 5.9.23 | Agreed, Da.{Bernard Day - Chassis Design} MR. BAILEY | 3.9.23 | Agreed, BY.{R.W. Bailey - Chief Engineer} MR. PLATFORD | 3.9.23 | Agreed, EP.{G. Eric Platford - Chief Quality Engineer} What about retrospective action. Suggest column to this effect at 'A' MR. ELLIOTT | 5.9.23 | Agreed, E.{Mr Elliott - Chief Engineer} MR. NORTHEY | 4.9.23 | Agreed, FN. MR. HIVES | 12.9.23 | Agreed, E.Hives. | ||