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).
Performance graph comparing twin carburettor systems with a standard P1 carburettor and induction system.
| Identifier | Morton\M19\ img111 | |
| Date | 1st July 1931 | |
| TWIN R.R-CARBS AND INDUCTION SYSTEM COMPARISON WITH STANDARD P1 CARBURETTOR AND INDUCTION SYSTEM TEST BED EXHAUST SYSTEM V1023 BHP RPM MEP 120 110 100 90 80 70 60 50 40 1000 1500 2000 2500 3000 TWIN CARBS 1.35 DIA CHOKES TWIN CARBS 1.25 DIA CHOKES STANDARD P1 CARB. INDUCTION R&S 1.7.31 | ||