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).
100-hour engine test report on leaded Anglo Persian Spirit fuel to observe its effects on engine condition.
| Identifier | ExFiles\Box 179\2\ img068 | |
| Date | 18th December 1931 | |
| ORIGINAL To R.{Sir Henry Royce} from Hs{Lord Ernest Hives - Chair}/Yng. c. to J.S. c. to Re. c. to By.{R.W. Bailey - Chief Engineer} X2765. X12821. Hs{Lord Ernest Hives - Chair}/Yng.2/KT.18.12.31. ANGLO PERSIAN SPIRIT + 3¾ ccs TEL/gal. We intend to run a 100 hours test on a leaded fuel in order to see what effect the lead has on the engine condition. The above fuel has been chosen since the Anglo Persian spirit has a low knock rating and therefore needs a maximum quantity of lead to bring the rating up to a set standard. In this case the standard has been taken as D.T.D.134 and the 3¾ ccs of T.E.L. which it has been necessary to add to the Anglo Persian spirit to bring it up to this standard, is considered to be the maximum which will be added to any spirit. Octane numbers for D.T.D.134 and Anglo Persian + 3¾ ccs TEL/gal are 76 & 79 respectively. Kestrel engine No.27 was used for the test. This is a standard fully supercharged engine with a compression ratio of 6/1. Lodge A.2. spark plugs were used and the water outlet temperature was maintained at 75°C throughout. Tests Carried Out. Curves 266 & 267 'F' (attached) were run off at constant r.p.m. - 2000 - and varying boost pressure using the 3 fuels - D.T.D.134 + 3 ccs TEL/gal; D.T.D.134, and Anglo Persian + 3¾ ccs TEL/gal. All powers were taken at weakest maintained consumption. In order to form an idea of what to expect if an engine which had been tuned up for D.T.D.134 was run on Anglo Persian fuel, a constant boost power curve 268 'F' (attached) was run off at the rated boost (- ¼ lb/sq.in.) The engine was tuned up to a standard weakest maintained consumption of approximately .54 pt/bhp/hr. at 2250 r.p.m. on D.T.D.134 and curves run off on (a) D.T.D.134 and (b) Anglo Persian fuel with the jet setting kept constant. The two consumption loops (curve 269 'F' attached) were run off to determine what the full power and weakest maintained consumptions were on Anglo Persian as compared with D.T.D.134 Conclusion. From the curves we can draw the following conclusions - | ||