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).
Graph of heat flow to cooling water versus increasing exhaust back pressure for an E.A.C. engine at 1500 RPM and 50 B.HP
| Identifier | ExFiles\Box 24\5\ Scan038 | |
| Date | 27th April 1925 | |
| HEAT FLOW TO COOLG. WATER. WITH INCREASING EXHAUST BACK PRESSURE. E.A.C. ENGINE. AT 1500 RPM. AND 50 B.H.P. THE SPEED & H.P. IS CONSTANT FOR THIS TEST. AS THE EXH. BACK PRESSURE IS INCREASED THE POWER IS KEPT THE SAME BY INCREASING THE THROTTLE OPENING. B.TH. Us. PER MIN. 4000 3500 3000 No 3. % AGE OF POWER GIVEN WITH NORMAL AMT BACK PRESS. 100 90 80 70 60 % BACK PRESS'N RELATIVE TO NORMAL. 0 10 20 30 40 50x100 / FP{F. Potts} WITH NORMAL BACK PRESS. A.C.L. / 28/4/25 | ||