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 showing power increase on a 20HP engine due to lower depression in the induction pipe.
| Identifier | ExFiles\Box 5a\5\ 05-page040 | |
| Date | 30th March 1927 | |
| 20HP POWER INCREASE DUE TO LOWER DEPRESSION IN INDUCTION PIPE ENGINE No 11-GII COMPRESSION RATIO 5.42 to 1 OPEN EXHAUST CURVES CORRECTED TO N.T.P. BHP STD. 20HP CARB. ZENITH TRIPLE VENTURI HORIZONTAL CARB TWO ZENITH T.C.M. CARBS INDn PIPE DEPN STD. 20HP CARB. ZENITH TWO ZENITHS AXIS LABELS: Left Y-Axis: BRAKE HORSE POWER Right Y-Axis: INDUCTION PIPE DEPRESSION (INCHES OF MERCURY) X-Axis: R.P.M. OF ENGINE. | ||