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 test results for the 27 Ex. Car at Brooklands, detailing acceleration and speed data.
| Identifier | Morton\M19\ img294 | |
| Date | 5th October 1931 | |
| L C.2905/6 27 Ex. CAR. PERFORMANCE TESTS ON BROOKLANDS 5TH OCT. 1931 R.R. TWIN CHOKE CARBURETTER. (MODIFIED TO CURE FLOODING ON CORNERS) WITH AIR SILENCER (EXPTL.) 114° W.W. CAMSHAFT (E.82448) COMPRESSION RATIO 4.8:1. REAR AXLE RATIO STANDARD (3.727:1) CAR WEIGHT COMPLETE 46 CWT. 2 QRS. 21" RACING TYRES. (EFFECTIVE CIRCUMFERENCE AT 50 LBS/D") PRESSURE 105.75" = 599 REVS/MILE. ENGINE REVS/MIN. AT 60 M.P.H. TOP GEAR = 2233 ALL RESULTS WITH CUT-OUT OPEN BEST LAP SPEED 87.1 M.P.H. HALF MILE 89.1 M.P.H. MILE 87.38 M.P.H. AGAINST STRONG HEAD WIND. VALVE TIMING .013" CL'NCE. I.C. 59.7° E.O. 56.6° B.D.C. I.O. 2.2° E.C. 12.7° ACCELERATION. TOP GEAR. ROAD SPEED (M.P.H.) TIME (SECS.) | ||