Graph showing test results for different induction pipe variations on a 25 HP experimental engine with an SU HV4 carburettor.
| Identifier | ExFiles\Box 31\5\ Scan010 | |
| Date | 25th January 1933 guessed | |
| Top axis: 190, 180, 170, 160, 150 Left axis: 1/8 R.R. Exp: engine 25 H.p. showing different needles necessary for different variations in induction pipe Carb: type SU HV4 No 1 RR pipe balance hole blocked up No 2 do. - - 1/4" dia hole carburetter fitted between No 1+2 5+6 cy: No 3 do. balance hole 1" dia Carbs. fitted between 2+3 4+5 cy: Plot labels: 1, 2, 3 | ||
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).