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).
Graph plotting Oldsmobile crankcase pressure in inches of water against speed in M.P.H. under four different test conditions.
| Identifier | ExFiles\Box 132\3\ scan0113 | |
| Date | 10th August 1938 | |
| OLDSMOBILE CRANKCASE PRESSURE A: GAS METER CONNECTED TO EXTRACTOR PIPE (INTAKE BLANKED) B: EXTRACTOR PIPE BLANKED (INTAKE OPEN) C: EXTRACTOR PIPE TAKEN OFF LEAVING SHORT PIPE ONLY (INTAKE BLANKED) D: STANDARD INCHES OF WATER M.P.H 3 INCHES OF WATER VALUE FOR EXTRACTOR PIPE AT 70 M.P.H WB{Mr Brazier/Mr Bell} | ||