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).
Addition to a report on tests for the valving efficiency of F.II A Bentley engines, comparing cylinder heads.
| Identifier | ExFiles\Box 86\1\ scan0036 | |
| Date | 30th November 1933 | |
| To Sg.{Arthur F. Sidgreaves - MD} From Hs{Lord Ernest Hives - Chair}/Std. C. Wor.{Arthur Wormald - General Works Manager} E.{Mr Elliott - Chief Engineer} Ks- C. Hy.{Tom Haldenby - Plant Engineer} En. Hs{Lord Ernest Hives - Chair}/Std.3/KT.30.11.33. FURTHER ADDITION TO REPORT ON TESTS ON EFFICIENCY OF VALVING OF F.II A BENTLEY ENGINES. Hs{Lord Ernest Hives - Chair}/Std.11/VA.24.8.33. Since making the above mentioned report, some tests have been carried out with the object of comparing the standard Bentley cylinder head with EB.1237 and a proposed design of head to Lec.3673. The points in which the cylinder heads differ from standard are as follows :- (1) EB.1237 Cyl. Head:- The head is of aluminium, with large diameter inlet valves (1.5" throat) and has the induction port displaced relative to the inlet port, i.e. eccentric, so that there is a tendency to throw the air more to the free side of the valve (similar to Lec.3571). (2) Lec.3673 Cyl. Head:- This is an entirely new proposed design of combustion chamber and valve arrangement, and aims at achieving a very good volumetric efficiency, while retaining as good turbulent properties as the standard head. A drawing of the combustion chamber and valves is attached, and a wooden model of this head was used for the tests. A wooden model of the standard head was also used for comparative purposes. List of Tests (All test except 7. at full valve lift .400") :- 1. Air flow press.difference curve for standard EB.615 head. 2. Air flow press.difference curve for EB.1237 head. | ||