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 valves to overcome exhaust valve failures.
| Identifier | ExFiles\Box 35\3\ scan 050 | |
| Date | 16th August 1923 | |
| R.R. 755 (10M) (SL 72 18-7-23) MP 274954s. STANDARDISATION of CHASSIS PARTS. Description of Parts. VALVES Origin To overcome exhaust valve failures. Experimental Test Report See report Hal/LG15.8.23. Our recommendation is to revert to the pre-war shape of valve and angle of seating but to retain present material. Road Test Report. All pre-war cars fitted with these valves. X No. 2764 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. Cost of Old Part. £ - - - - Cost of New Part. £ - - - - Difference per Car. Made in production quantities there will be no difference in cost. Cost of Parts in Works which will be scrapped if commenced on:- see memo. attc. Series.........£......... Series.........£......... Series.........£......... Signature of Mr. De LOOZE that above is correct. My/JW 23.8.23. SIGNATURES MR. JOHNSON MR. B. JOHNSON MR. ROYCE MR. WORMALD MR. ROWLEDGE MR. DAY MR. BAILEY MR. PLATFORD MR. ELLIOTT MR. NORTHEY MR. HIVES DATE 6 Sept 30.8.23 27.8.23 16.8.23 20.8.23 18.8.23 16.8.23 16/9/23 27.8.23 20.8.23 29.8.23 REMARKS agreed to Johnson Agreed. BJ. No scrap - see Hal/LG31.8.23. Agreed. MHR.{M. H. Rigby} Valve heads should be modified to agree to recent improved standard practice i.e. head only slightly larger than seat and less sharp. Edge to valve. Agreed. Wor.{Arthur Wormald - General Works Manager} Agreed. Rg.{Mr Rowledge} Agreed. Da.{Bernard Day - Chassis Design} Agreed. BY.{R.W. Bailey - Chief Engineer} Agreed. Note the point re allowance for tuning when regrinding. EP{G. Eric Platford - Chief Quality Engineer} Agreed. E.{Mr Elliott - Chief Engineer} Agreed - but am not aware of any cases of failure arising from this. PN.{Mr Northey} Agreed. E.Hives. | ||