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).
Programme of test bed work for a B.III No.1 Unit, detailing investigations into exhaust systems and cylinder head configurations.
| Identifier | ExFiles\Box 155\2\ scan0217 | |
| Date | 21th May 1938 | |
| 1315 To Rm.{William Robotham - Chief Engineer} from Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} c. Rm{William Robotham - Chief Engineer}/Mths.{Reg Matthews} c. Rm{William Robotham - Chief Engineer}/CTS.{C. Trot Salt - Carburation} Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}7/MH.{M. Huckerby}21.5.38. PROGRAMME OF TEST BED WORK. Further to Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}2/MH.{M. Huckerby} 27.4.38. NO. 30 BED. B.III No.1 UNIT (a Bed). Continue double exhaust system investigation on following lines both for power comparison and noise. (a) Double outlet manifold with 2 completed B.II exhaust systems. (b) As (a) but without front expansion box which should be substituted by equivalent length of pipe. (c) As (b) but without intermediate silencers, substituted by equivalent length of pipe. (d) As (a) but without intermediate silencers, substituted by equivalent length of pipe. Comparison of above tests for power with open exhaust figure. With 2 complete systems take following curves, other conditions of the unit being as Std. B.III. (a) Small valve head, i.e. 1.5 Inlet and 1.3 Exhaust which with std. C and A gasket will give a compression ratio of 6 : 1 (head 130 ccs). (b) Std. head, i.e. 1.6 Inlet and 1.4 Exhaust with same capacity as (a) (c) Head as (a) but with inlet valves opened up to std. 1.6 dia. (d) If (c) shows up an appreciable improvement over (a) and no loss against (b) then inlets to be opened up to 1.700 dia. and then running with 1.3 dia. exhaust valves. | ||