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).
Tests on engine tappet clearance and the resulting noise levels.
| Identifier | ExFiles\Box 13\2\ 02-page145 | |
| Date | 24th November 1931 | |
| To R.{Sir Henry Royce} From Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} c. to Sg.{Arthur F. Sidgreaves - MD} Wor.{Arthur Wormald - General Works Manager} c. to By.{R.W. Bailey - Chief Engineer} 8709a Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}3/MJ.24.11.31. TAPPET CLEARANCE. x5090 With reference to R.4/M16.11.31. We have made some tests on tappet clearance and noise. With the existing 40/50 standard camshaft we find that tappets start to become noisy at .006 clearance and at .010 the amount of noise is quite intolerable from an R.R. point of view. We will get some average figures on the 25 HP. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||