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).
Weight specifications and comparisons for various types of large inlet valves.
| Identifier | ExFiles\Box 17\6\ Scan127 | |
| Date | 8th August 1933 | |
| X7060. P.II. LARGE INLET VALVES. STANDARD INLET VALVE - 146.25 grms. " & CAP, COTTERS ETC. - 176.67 grms. --------- LARGE INLET VALVE (Original one with regrinding lip) - 179.94 grms. VALVE + CAP & COTTERS ETC. 216.03 grms. --------- LIGHTENED VALVE - 161 grms. " & CAP, COTTERS ETC. 191.42 grms. - i.e. 8.36% heavier than standard. --------- Reduction in wt. due to drilling hole 1/8" bore 4" long = 6.3 grms. Wt. of valve then = 154.7 grms. i.e. 4.8% heavier than standard. Hs{Lord Ernest Hives - Chair}/Std. | ||