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).
Air flow and pressure difference tests on various cylinder heads and valves.
| Identifier | ExFiles\Box 88\4\ scan0015 | |
| Date | 24th August 1933 | |
| -3- (5) Air Flow/valve lift curve (pressure difference across valve constant for large valve cylinder head (E.53906):- This curve was taken, keeping pressure difference across valve constant and increasing valve lift from zero to 1" lift. (6) Air Flow/press difference curves for large valve Cyl. Head (E.53906) with and without regrinding line on valves The inlet valves (E.53904) as fitted to cylinder head (E.53906) had a regrinding lip on them (Diagram (3) ) which was hardly a good streamline shape. This lip was removed and one set of valves and curves taken to compare with (5). (7) Air Flow/press. difference curve for special head - standard E.head fitted with inlet valves smaller than standard (1.7" instead of 1.75" dia.):- This test was carried out exactly as (2) at full lift only. (8) Air Flow/press. difference curve for 8 litre Bentley 4 valve "single port" head :- This test was carried out on a Bentley 8 litre cylinder block received from Bentley Motors Ltd., exactly as (2) - at full lift only. (B) Rells-Bentley. (1) Air Flow/press difference curve for standard R head EB22 This curve was taken at pressure differences to give flows corresponding to engine speeds of 3750-4500 RPM. and at full valve lift. (2) Air flow/press difference curve for Japson head - E.56604:- This curve carried out exactly as (1). | ||