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 for the standardization of chassis parts, specifically to adopt Silchrome No.1 for exhaust and inlet valves.
| Identifier | ExFiles\Box 81\2\ scan0071 | |
| Date | 30th October 1923 | |
| R.R.A.160-1 10M-2-1-23 45625 ROLLS-ROYCE OF AMERICA, INC. SPRINGFIELD, MASS. PROPOSED STANDARDIZATION OF CHASSIS PARTS No. 25 Alteration No. 4000/A Date: October 30, 1923 Handwritten: X4616 F/3688 To Mr. Belnap The following is proposed: PIECE NOS. AFFECTED: 5060 SECTION NO. NAME OF PARTS: Valves Signatures implying agreement with the alteration: NAME | INITIALS | DATE Mr. Olley | Oy | Aug. 18 Mr. Nadin | Na{Mr Nadin} | " Mr. Bagnall | Bg | " Mr. Hulley | WH | " Mr. Southern | (SWy) | Mr. Caswell | EWC | " Mr. Ross | ACR | " Mr. Beaver | HCS | " Mr. Belnap | LJB | " Mr. Royce Mr. Johnson DESCRIPTION of Alteration: To adopt Silchrome No.1 for exhaust and inlet valves chassis 802 onwards. Using 45º seats as proposed by England. Specifications | Quick Step R.R.211 | Silchrome No.1 Carbon | .40 - .47 | .50 Cr.{Mr Cra???ster / Mr Chichester} | 6.50 - 7.50 | 9.00 Mn. | .40 - .60 | .30 - .50 Silicon | .60 - 1.00 | 3.50 S. | Max. .04 | P. | " .04 | PURPOSE of Alteration: Improved performance. Facility in obtaining valves. Valves Tested | Mileage | Reground | Condition seats | Condition stems (1) 6 valves | 5750 | No | No.2 exhause slightly pitted | good. (2) 6 valves | 11,600 | Once | Good | " (3) 6 valves | 17,550 | twice | " | " Lots 2 and 3 ran 7000 miles at end of run without regrinding. No reason for changing any of these valves except necessity of testing valves with new stems for wear in guide bushes. All valves had 30º seats and were of standard form. We propose to put this alteration into regular manufacture on January 15, 1924 unless we hear from Mr. Johnson and Mr. Royce to the contrary. Tested: See table Estimated cost: No change. Valves cost 98¢ each finished. Proposed Chassis at which alteration should start: 802 Cost of parts scrapped, if any: None Increase in weight, if any: None. | ||