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).
The Brooklands testing of the Continental P.2. car, comparing a new camshaft against a high compression ratio.
| Identifier | ExFiles\Box 19\1\ Scan123 | |
| Date | 1st October 1931 | |
| X 7120. To PN.{Mr Northey} from Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}7/AD5.10.31. BROOKLANDS TEST. X.7120. X.7090. As you are aware, Sg.{Arthur F. Sidgreaves - MD} is anxious that we should standardise some improvement for the Continental P.2. car. So far the only available improvement is the high compression ratio because the twin carburetters are still in a state of re-organisation. The point will arise whether the new W.W. camshaft cannot also be used to boost up the Continental P.2. while the twin carburetters are being perfected. Our own opinion is that this camshaft may reduce the low speed accelerating powersof the car without improving its maximum speed appreciably when it is used with the standard carburetter which, owing to its hydraulic resistance, will nullify the benefit which the new camshaft gives us at high speeds. However, we have never made a comparative test of these two combinations but propose to do so on Wednesday next. 25-EX represents the standard car with the higher compression ratio which has just run 10,000 miles, and we shall bring down 27-EX which in addition to this will have the new camshaft. We hope to be on the track some time about 10-30 a.m. Will you please confirm that 25-EX will be available at the time stated. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||