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).
Modifications and testing of a Peregrine engine camshaft.
| Identifier | ExFiles\Box 1\10\ B001_X106 TO X 110-page047 | |
| Date | 20th March 1932 | |
| To [REDACTED] from Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson} C. to [REDACTED] C. to [REDACTED] X107. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}5/RT. 20.3.32. PEREGRINE CAMSHAFT. We have now run the camshaft with the toe reduced .005" each end to Byl6/W21.7.32, the camshaft having 108º between the cams, to print E.100543. Reducing the toe has improved the slow running as anticipated, and also the low speed power, but, due to the reduced overlap and lift, the top HP. is down to 67, which is rather lower than we had hoped. Before we therefore make six of these camshafts (as instructed in E7/HP15.8.32), we want to try our experimental camshaft Hs.{Lord Ernest Hives - Chair}632 with the toe removed as per Byl6/W21.7.32. This camshaft differs from E.100543 in that both exhaust E.100362 and inlet E.100361 cam forms are used with 108º between the cams. We attach sketch Hs.{Lord Ernest Hives - Chair}632. When the toe is reduced, the timing on this drawing will of course be obtained with .013 instead of .020 tappet clearance. This camshaft is somewhat urgent as on the results depends the instruction for the first six cars, but if, before the tests are completed, something has to be produced to prevent delaying the new units E.100543 will have to be worked to. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||