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).
Report page discussing the effects of valve lift and clearance on engine brake horsepower.
| Identifier | Morton\M19\ img268 | |
| Date | 28th October 1931 guessed | |
| -2- us greater duration of opening on the inlet valve. We might also gain from a greater lift on the exhaust valve. A test with the 114° shaft A.{Mr Adams} shewed that if the exhaust valve clearance was increased to .030 a drop of 5 B.H.P. ensued at 3000 R.P.M. | ||