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 proposal for a longer skirt piston to safeguard against piston knocks.
| Identifier | ExFiles\Box 15\3\ Scan058 | |
| Date | 17th April 1931 | |
| RR 755 (10H) (8459, 24-10-30) 6/3185. COMPLETED 6.5.31. STANDARDISATION of CHASSIS PARTS. Description of Parts. LONGER SKIRT PISTON. Origin. To safeguard against development of piston knocks. Experimental Test Report. The longer skirt pistons have been helpful in overcoming piston knocks. These have been a standard production on Springfield cars for a number of years. Road Test Report. We have tried five sets of these pistons on the dynamometer and considerable mileage on the road the results have been very satisfactory. For R.H. and L.H. cars. Weight of Old Part. Weight of New Part. Difference per Car. Cost of Old Part. £2-4-2 Cost of New Part. £2-6-2 Difference per Car. £0-2-0 increase Signature from Cost Dept. that above is correct. GRL 2/5/31 4/5/31 INITIAL | DATE | REMARKS SG.{Arthur F. Sidgreaves - MD} | 5-5-31. | Agreed Sg.{Arthur F. Sidgreaves - MD} R.{Sir Henry Royce} | 22.4.31. | Agreed FHR. There have been many modifications to keep the lower part stiffer, such as raising the pin nearer the stiff part and ribs. The lower part of the pistons have always been too flexible. In the face of booms and pistons being the cause, we must be very careful about increase in weight of pistons. WOR.{Arthur Wormald - General Works Manager} | 21.4.31. | Agreed Wor.{Arthur Wormald - General Works Manager} C. | 21.4.31. | Agreed C. RG.{Mr Rowledge} | 21.4.31. | Agreed Rg.{Mr Rowledge} DA.{Bernard Day - Chassis Design} | 21.4.31. | Agreed Da.{Bernard Day - Chassis Design} BY.{R.W. Bailey - Chief Engineer} | 21.4.31. | Agreed By.{R.W. Bailey - Chief Engineer} EP.{G. Eric Platford - Chief Quality Engineer} | 22.4.31. | Agreed. Very good on test. Should use on U.S.A. chassis immediately. EP.{G. Eric Platford - Chief Quality Engineer} E.{Mr Elliott - Chief Engineer} | 22.4.31. | Agreed EX. AE. PN.{Mr Northey} | 22.4.31. | Agreed PN.{Mr Northey} HS.{Lord Ernest Hives - Chair} | 22.4.31. | Agreed Hs.{Lord Ernest Hives - Chair} X No. 7040. Drawing No. 82041. 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. Cost of Parts in Works which will be scrapped if commenced on:- Series.........£......... Series.........£......... Series.........£......... [Handwritten at top] X 7040 [Circular Stamp] RECEIVED 5 MAY 1931 [Large Stamp Across Cost Section] VOID | ||