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).
Test results for pressure in the crankcase and clutch pit under various conditions and speeds.
| Identifier | ExFiles\Box 1\4\ B001_X 100a-page250 | |
| Date | 30th December 1932 | |
| Y4057 To Hs.{Lord Ernest Hives - Chair} from GWH.{George W. Hancock - Head Chateauroux} c. Rm.{William Robotham - Chief Engineer} E.{Mr Elliott - Chief Engineer} c. By.{R.W. Bailey - Chief Engineer} Hs{Lord Ernest Hives - Chair}/GWH.{George W. Hancock - Head Chateauroux}Z/KT.30.12.32. 2.PER.II. TESTS OF PRESSURE IN CRANKCASE & CLUTCH PIT. With Breather to Engine fitted & Plain Cover to Clutch Pit:- Speed Crankcase. Clutch Pit. M.P.H. 50 ... .1" Depression of water ... No pressure 60 ... .15" " " " ... " " 65 ... .2" " " " ... " " 70 ... .2" " " " ... " " Without Breather & Plain Cover to Clutch Pit:- Speed Crankcase. Press. of water. Clutch Pit. Press. of water. M.P.H. 30 ... .15" ) (Drop in Pressure .. .2" ) (Due to 40 ... .15" ) due to loss .. .2" ) press. 50 ... .15" ) of suction .. .2" ) going 60 ... .15" ) from carb. also .. .3" ) from 70 ... .15" ) going into .. .3" ) engine to 75 ... .15" ) clutch pit.) .. .3" ) clutch pit) With Breather & Scoop on Clutch Pit. Speed Crankcase. Clutch Pit. Press. of water. M.P.H. 50 ... .1" Press. of water .. .1" 60 ... ) No press. - .. .2" ) (Due to 65 ... ) (Depression being .. .2" ) effect of 70 ... ) overcome by .. .25" ) scoop over- 75 ... ) effect of scoop .. .3" ) coming press. ) fitted to clutch .. ... ) in engine case) ) pit.) | ||