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).
Tabulated report of test results for modifications to gearboxes and related components on various car models.
Identifier | ExFiles\Box 94\1\ scan0225 | |
Date | 2nd November 1935 | |
-2- Rm{William Robotham - Chief Engineer}/Gry.{Shadwell Grylls}7/KW.2.11.35. CAR | TEST | RESULT (1) 29-EX | Original separate synchro and speed J-3 box | Worse than Standard Ph.II (2) 29-EX | 12° gears having very little total backlash. 3rd gear .013 at 1.875 on 3rd motion shaft. | Very good (3) 35-EX | C.M. and 3rd continuous and motion shaft gears tight on splines | Improvement (4) 36-EX | C.M. .0045 pitch line} 3rd .0045} Sliding piece .003 on splines .003 in top dogs, .003 in 3rd | Bad in 3rd gear (5) 35-EX | Same as (4) but C.M. pitch line slack .001. | Much better in 3rd gear. Any SpectreCodename for Phantom III | Heavy flywheel or softer rubber mounting | Improvement 30-EX | Mobiloil 'C' instead of Hi-Press light. | No improvement (8) Buick | Original condition .005 sliding piece, .008 C.M. pitch line, .015 sideshaft and float. | No chunking (9) Buick | (a) Sliding piece increased to .025, and subsequently, (b) C.M. pitch line increased to .012, and subsequently (c) C.M. instead of Whitmore's oil. | No difference | ||