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).
Indicator diagrams showing engine performance with single straight pipes at various RPMs.
| Identifier | ExFiles\Box 66\2\ scan0030 | |
| Date | 27th February 1925 guessed | |
| SHEET 2 SINGLE PIPES. 1 STRAIGHT PIPE TO EACH PORT WITH EXCEPTION OF 1000 & 600 RPM Graph 1 (Top Left): 2500 RPM 130 lbs. BMEP = 91.5. IMEP 119. Graph 2 (Top Right): 1000 RPM 143 lbs. THIS DIAGM IS BELOW THE AVERAGE SEE CORRESPG DIAGM ON SHEET. 1. Graph 3 (Middle Left): 2000 R.P.M. 142.5 lbs. 100.5=BMEP. IMEP 125. Graph 4 (Middle Right): 600 RPM 148 lbs BMEP = 104.5. IMEP 110.7. Graph 5 (Bottom Left): 1500. RPM. 153. lbs/□" BMEP = 107.7 lbs/□" IMEP. 128.5. | ||