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).
Standardisation of 45° angle valve seats to avoid valves burning on 20 HP cars.
| Identifier | ExFiles\Box 172\1\ img040 | |
| Date | 1st September 1923 | |
| R.R. 755 (10M) (SL 72 18-7-23) MP 274954s. COMPLETED 14.9.23. STANDARDISATION of CHASSIS PARTS. Date 1.9.23. Description of Parts: 45° angle seats [STAMPED: ORIGINAL] Origin: To avoid valves burning. [BOX] 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. [/BOX] Experimental Test Report: We have had a number of instances of valves burning on 20 HP. cars both on experimental and customers cars. Tests prove 45° angle seats a definite improvement. See report Hs{Lord Ernest Hives - Chair}1/LGL.9.23. Road Test Report: Run on Test Bench for 24 hours. Fitted to 4-G-11 and 7-G-11. This follows the practice now adopted on 40/50 H.P. Present valves can be modified. Weight of Old Part: --- Cost of Old Part: £ --- Weight of New Part: --- Cost of New Part: £ --- Difference per Car: --- Difference per Car: £ No change in cost. 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 | 13.9.23 | Agreed. CJ. MR. B. JOHNSON | 13.9.23 | Agreed. BJ. MR. ROYCE | 5.9.23 | FHR. agreed. Uniformly believed the 45° seat is the best but not yet conclusive why 40/50 needs one shape of valve & 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 QE. MR. NORTHEY | 4.9.23 | Agreed. PN.{Mr Northey} MR. HIVES | 12.9.23 | Agreed. E.Hives. [LARGE GREEN STAMP: HP CHASSIS] | ||