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).
Performance of the Peregrine Cylinder Head and proposing improvements based on other designs.
| Identifier | ExFiles\Box 2\3\ B002_X 116 117 119 120-page31 | |
| Date | 1st October 1932 | |
| To H.{Arthur M. Hanbury - Head Complaints} from E.{Mr Elliott - Chief Engineer} c. Sw. Her. Hs.{Lord Ernest Hives - Chair} Brx re Peregrine Cylinder Head. Please find attached prints of LeC.3119 and LeC.3222 in connection with the above. The former shows the J.1. cylinder head in its present form with improved water cooling on the sparking plug side of the combustion chamber. This head is the best we have at the moment for all round performance, and is superior to both J.3 and Peregrine. As compared with Peregrine it is, we understand, 10 lbs better on the B.M.E.P. in the lower ranges of speed. We have been struggling to improve the pickup of Peregrine/which seems to be due mainly to lack of turbulence. the deficiency of For this reason we think the smaller inlet valves 1.125 diameter, same as exhaust, give a better result. The smaller inlet valve, however, rather demands a long duration cam for the upper part of the horse-power curve, which cancels the improvement at low speed, hence if we could use the larger inlet valve with shorter duration we would rather do so. We, therefore, propose to try the Peregrine head with extended lips as shown on LeC.3222 to get the J.1. effect. E.{Mr Elliott - Chief Engineer} | ||