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).
The estimation of air velocity through inlet ports, including formulas and calculated air flows for a Phantom engine at various RPMs and valve lifts.
| Identifier | ExFiles\Box 88\4\ scan0026 | |
| Date | 24th August 1933 guessed | |
| -5- (2) Estimation of air velocity through inlet ports. Set V = vol. of air/cyl/sec. taken. Set 1/N = ratio of period of effective valve lift/period of cycle. Set l = valve lift. Set l = mean valve lift. " V2 = vol air/sec through port. Assuming depression in cylinder on induction stroke to be approx. constant. V2 = V x N x l/e Tests to be carried out at flows corresponding approx. to 2750, 3000, 3250, 3500 R.P.M. and at 1/3, mean (.354") and full (.430") lift. Calculated air flows required. Phantom:- 2750 R.P.M. V2 = 64 cu.ft/min. - 1/3 lift. " V2 = 141.5 cu.ft/min. mean lift. " V2 = 192.0 cu.ft/min. Full lift. 3000 R.P.M. V2 = 68.0 cu.ft/min. 1/3 } " = 150.0 cu.ft/min. mean } lift. " = 203.5 cu.ft/min. Full } 3250 R.P.M. V2 = 70.7 cu.ft/min. 1/3 } " = 156.5 " " mean } lift. " = 212.0 " " Full } 3500 R.P.M. V2 = 72.2 " " 1/3 } " = 160.0 " " mean } lift. " = 216.5 " " Full } | ||