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).
Test report on a Compression Ignition Unit, detailing performance, fuel consumption, and exhaust observations.
| Identifier | WestWitteringFiles\U\January1930-April1930\ Scan105 | |
| Date | 28th February 1930 | |
| ORIGINAL To R.{Sir Henry Royce} From Hs{Lord Ernest Hives - Chair}/ACL.(Held up). c. to Sg.{Arthur F. Sidgreaves - MD} Mor. c. to RG.{Mr Rowledge} E.{Mr Elliott - Chief Engineer} c. to HY.{Tom Haldenby - Plant Engineer} Hs{Lord Ernest Hives - Chair}/A.L.2/AJ.28.2.30. K4433 COMPRESSION IGNITION UNIT. Up to date we have completed approximately seven hours running on this unit and yesterday did a thirty minutes A.I.D. observed test running at 1300 R.P.M., 53 B.M.E.P. and 18.7 B.H.P. Appended sheet gives the figures obtained during this test. The fuel consumption was surprisingly high, amounting to 1.25 lbs/BHP/Hr., but another test was made of 15 minutes duration with the point of fuel injection further advanced so that injection started 23° A.T.C. or 2° earlier than the previous test. We were then able to reduce the duration of injection and still maintain the same power. This considerably improved the consumption, bringing the figure down to .6 lbs/BHP/Hr. The exhaust was reasonably clean during all these tests but when run with an open port there was considerable after-burning and flaming. The exhaust was exceptionally noisy and a plate held near the open port became splashed over with unburned fuel. The valve timing used is given on the test report and we could not obtain any appreciable improvement by variation from this timing. It has been found necessary both for starting and continued running to employ external heating of the air. This | ||