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).
Test report comparing three different camshafts for the Bentley B80 engine.
| Identifier | ExFiles\Box 124\2\ scan0006 | |
| Date | 5th January 1940 | |
| To Rm.{William Robotham - Chief Engineer} from Rm{William Robotham - Chief Engineer}/FH. Rm{William Robotham - Chief Engineer}/FH.1/BA.5.1.40. Bentley B80 - Camshafts. EB.4105 (Original). Long duration inlet and exhaust. (Approx. same duration.) EB.4512. Short duration inlet, exhaust duration remaining the same as EB.4105. Ex.33975. Angle between cams altered to give reduced overlap. Purpose of test. To compare the above three Camshaft on one engine. Conditions of test. Engine. B.80.No.1. Cyl.Head. EB.4098 (126 c.c.) C/R.{Sir Henry Royce} 6.2:1 Note: Combustion chamber as EB.3544 (B.60 cyl.head). Valve Springs: Inlets. inner.(E.86364. outer.(S.88325. Exhaust. EB.3256. Push Rods. EB.4709 - 4% carbon steel. Pistons: EB.3916, Aerolite. (.040" down base) Induction System. 1.600" bore pipe. Stromberg AA.{D. Abbot-Anderson}25 Carburetter (Duplex) 36 m/m throttle. 1 1/2 choke. All the tests were carried out without an air silencer, as there was not one available at this time. continued. | ||