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).
Acceleration and expanding carburettor tests at Brooklands.
| Identifier | ExFiles\Box 13\4\ 04-page001 | |
| Date | 13th July 1932 | |
| X7080 Morning. Copy for Brooklands File. X788 13.7.32. 22-EX. Acceleration tests carried out with 7 x 20 tyres fitted, over the half mile, with these tyres on, cut-out closed. At Brooklands. 7 x 20" tyres. Lap speed Air Temp. 22.5°C. over 1/2 mile 21.4 secs 81.62 M.P.H. Expanding Carb. Cut-out closed Lap. 119 secs 83.70 M.P.H. " Open Lap. 113 " 88.15 M.P.H. "Repeat" Cut Out open. Lap. 112.5 secs 88.54 M.P.H. Cut-out Closed 1/2 mile - 21 secs. 85.71 M.P.H. Cut-out Open 1/2 mile - 19.8 " 90.91 M.P.H. "Repeat" Cut-out Open 1/2 mile - 20 secs 90.00 M.P.H. With air-piston removed as Rn.{Mr Robinson} instructed: Jet held in position in centre of cock. Position:- 1 1/4" above face of carb. - Swindall know's where this position is exactly. Series of tests - with piston out of carb - 1 1/4" from face. Lap Speed C.O. - 111 secs 89.74 M.P.H. 1/2 mile C.O. - 19.5 " 92.31 M.P.H. "Best Position" } with piston } piston out of car 1 1/4" from face. removed. } Lap Speed C.O. 109.8 secs 90.72 M.P.H. 1/2 mile C.O. 19.2 " 93.75 M.P.H. piston out of carb 1 3/8" from face. Lap Speed C.O. 110.4 secs 90.22 M.P.H. 1/2 mile C.O. 19.5 secs 92.31 M.P.H. "Best Position" } with piston } piston out of carb - 1 1/2" from face. removed. } Lap Speed Cut-out closed 116.4 secs 85.57 M.P.H. 1/2 mile " " 20.5 secs 87.80 M.P.H. Acceleration tests :- 10-20 4.7 secs 40-50 6.35 secs with 7 x 20 tyres 20-30 5.2 " 50-60 7.00 secs (average of two track) 30-40 4.9 " 60-70 9.5 secs. positions. | ||