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).
Experiments for increasing horsepower on a P.2 engine.
| Identifier | ExFiles\Box 182\M19\ img188 | |
| Date | 3rd June 1931 | |
| To R.{Sir Henry Royce} From Hs.{Lord Ernest Hives - Chair} c. to Sg.{Arthur F. Sidgreaves - MD} For. c. to E.{Mr Elliott - Chief Engineer} Ds. c. to Hy.{Tom Haldenby - Plant Engineer} Hs.{Lord Ernest Hives - Chair}3/MJ.3.6.31. X7771 X7090 P.2 EXPERIMENTS FOR INCREASING HP. We attach herewith curves which shew the increase in HP. we have been able to obtain from a Std. P.2 engine with various modifications. It will be seen by the curve that with the modified camshaft, increase in compression ratio from 4.6 to 4.9 (this we have already done to certain customers cars- and twin carburetters free exhaust, we can increase our HP. at 3300 R.P.M. from 130 to 165 BHP. When considering camshafts we recommend that a masked type inlet valve should be considered. Ricardo has done a lot of work on this type of valve and should be able to give us some useful information. The engine runs quite smoothly at 3500 R.P.M. Hs.{Lord Ernest Hives - Chair} | ||