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).
Analysis of a 20 HP engine's power curves in comparison to a Lorraine engine, detailing an inlet valve with a detachable guide cage.
| Identifier | WestWitteringFiles\Q\February1927-March1927\ 112 | |
| Date | 28th November 1928 | |
| contd :- -8- ROLLS-ROYCE, LIMITED of cage which is removable from the top permitting the valve to be threaded out through the cylinder bore. (see adjoining sketch). The cage is only held in position by the valve spring pressure. [Blueprint Diagram Text] INLET VALVE WITH DETACHABLE GUIDE CAGE THREAD FOR WITHDRAWING REMOVABLE CAGE HELD IN BY SPRINGS ONLY VALVE SEATS IN CYL. HEAD POWER CURVES FOR 20 HP. RR. COMPUTED FOR SAME COMPRESSION RATIO AND INDUCTION PIPE DEPRESSION AS LORRAINE. On blue print No.9 we have shewn curves calculated for the 20 HP. shewing the I.H.P. and I.M.E.P. we should expect if the compression ratio were raised and the induction pipe depression reduced to the same values as the Lorraine. It will be noticed that the greater gain is expected from raising the compression ratio which should result in an increase of the M.E.P. by 10 lbs/sq.in. The lower induction pipe depression would give about 5 lbs/sq.in. increase in M.E.P. Although these two factors can account for a considerable part of the difference in M.E.P. between the two engines there still remains a difference of about 10 lbs/sq.in. contd:- | ||