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).
Series of four light spring diagrams comparing different exhaust manifold configurations on cylinder No. 1.
| Identifier | WestWitteringFiles\L\2Jan1924-March1924\ Scan93 | |
| Date | 20th October 1927 | |
| CONFIDENTIAL A.D.M.189 / 20.10.27 LIGHT SPG. DIAGMS 3EACII NO. 1. CYLINDER. LIGHT SPRING DIAGMS. FOR FOUR TYPES OF EXHAUST MANIFOLD BAR - 740 m.m. SPRING RATING. 6.2/IN. AIR TEMP = 15°C Graph 1: SINGLE ST PIPES 2000 RPM STRAIGHT EXH PIPE TO EACH PORT. ATMOS. BMEP with this transposed 77.8 Graph 2: STANDARD PIPE 2000 RPM LBS / SQ" BMEP 92.2. Graph 3: DOUBLE EXH MANIFOLD 2000 RPM 1 MANIFOLD TO EACH 3 CYLS. LBS/SQ" GAUGE BMEP 97.0 Graph 4: LARGE MANIFOLD 2000 RPM AS SINGLE MANIFOLD BUT 3.75 DIAM. ATMOS. BMEP 96.5. | ||