Rolls-Royce Archives
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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
  
  


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