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).
Brooklands test results comparing J.3. and S.U. carburettors, and water versus air oil coolers.
| Identifier | ExFiles\Box 155\1\ scan0088 | |
| Date | 23th May 1933 | |
| Files. X988 23.5.33. ---- BROOKLANDS TESTS. ---- 3.Per.II. & 4.Per.II. Tests of relative merits of J.3. carb. against 2 S.U. carburetters and also of water oil cooler against air oil cooler. Tests. Air temp. 24°C; wind down railway straight; morning. 4.Per.II. J.3. carb. weak needle, lap speed 2' 18" = 72.18 mph half mile = 74.38 mph strong needle lap speed 2'16.4" = 73.02 mph half mile = 75.00 mph Acceleration 10-30 mph in 10.5 secs 10-60 mph in 34 secs Petrol cons. to Brooklands 15.3 mpg. 3.Per.II. 2 SU. carbs. no air silencer lap speed 2'17.2" = 72.39 mph half mile = 75.00 mph - with air silencer-lap speed 2' 16" = 73.24 mph half mile = 75.00 mph Acceleration 10-30 in 9.5 secs 10-60 in 28.8 secs. Petrol cons. to Brooklands 15.6 mpg. ---- Air temp 24°C, afternoon, wind up railway straight. 4.Per.II. 2 SU. carbs with air silencer, lap speeds 2'18.4" = 71.97 mph 2'18" = 72.18 mph J.3. carb. re-fitted, lap speed 2'18.5" = 71.93 mph | ||