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).
Summary of light spring diagrams comparing four different exhaust manifold types for No. 1 cylinder.
| Identifier | ExFiles\Box 72\4\ scan0343 | |
| Date | 27th March 1924 guessed | |
| SUMMARY LIGHT SPG DIAGMS 3E.A.C. II LIGHT SPRING DIAGMS FOR FOUR TYPES OF EXHAUST MANIFOLD. SPRING RATING 6.2 / IN. BAR = 740 M.M. AIR TEMP = 15°C. NO. 1. CYLINDER. SINGLE ST PIPES 2000 RPM STRAIGHT EXH PIPE TO EACH PORT. BMEP, with this manifold 97.5. ATMOS. STANDARD PIPE 2000 RPM BMEP 92.2. ATMOS. lbs/□" E.O I.C DOUBLE EXH MANIFOLD 2000 RPM 1 MANIFOLD TO EACH 3 CYLS. BMEP 97.0 ATMOS. lbs/□" GAUGE LARGE MANIFOLD 2000 RPM SINGLE MANIFOLD 3.75 DIAM. BMEP 96.5. ATMOS. | ||