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).
Request for the manufacture of a set of open-ended valve springs for Phantom II Unit No. 28.
| Identifier | ExFiles\Box 17\6\ Scan231 | |
| Date | 31th May 1934 | |
| To RHC.{R. H. Coverley - Production Engineer} File 47060 Hs{Lord Ernest Hives - Chair}/Smth.24/KW.31.5.34. Valve Springs for P.II Unit No. 28. Will you please make us a set of open ended valve springs for this unit in readiness for the next 10,000 miles, to the following specification :- Outer Inner Wire dia. and gauge .212 (5 SWG) .128 (10 SWG) Inner dia. of coil 1.375 .975 Total number of coils 6 1/4 6 1/4 Free length 2.663 2.185 Length (valve closed) 2.000 1.750 Load (valve closed) 87.4 lbs. 22.6 lbs. Rating 132 lbs/in. 52 lbs/in. The springs to be parallel and ground flat on the ends for 270°. The existing bottom spring washers will fit these springs, but a new set of top washers will have to be made. Hs{Lord Ernest Hives - Chair}/F.Ll.Smith. | ||