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 carburetors with a standard P1 carburetor and induction system.
| Identifier | ExFiles\Box 182\M19\ img111 | |
| Date | 30th January 1931 | |
| TWIN R.R-CARBS AND INDUCTION SYSTEM COMPARISON WITH STANDARD P1 CARBURETTOR AND INDUCTION SYSTEM TEST BED EXHAUST SYSTEM V1023 TWIN CARBS 1.35 DIA CHOKES TWIN CARBS 1.25 DIA CHOKES STANDARD P1 CARB INDUCTION TWIN CARBS 1.35 DIA CHOKES TWIN CARBS 1.25 DIA CHOKES BHP RPM BMEP HFR / 30-1-31 | ||