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).
Suggesting a testing method for the P.2 exhaust system to identify the source of significant horsepower loss.
| Identifier | ExFiles\Box 14\6\ Scan218 | |
| Date | 1st October 1931 | |
| COPY. X7230. HS{Lord Ernest Hives - Chair}/RM.{William Robotham - Chief Engineer} FROM DA{Bernard Day - Chassis Design}/EV.{Ivan Evernden - coachwork} DA{Bernard Day - Chassis Design}/EV{Ivan Evernden - coachwork}4/M14. 10. 31. X7230. P. 2. EXHAUST SYSTEM. We thank you for HS{Lord Ernest Hives - Chair}/RM{William Robotham - Chief Engineer}/AD91031., and note that at 3000 RPM. approximately 45HP. is lost in the standard silencer system. We can quickly give you a revised exhaust system, but we would like some indication as to which are the parts of the system that account for most of the loss of power, and we suggest that you could make a test giving us the HP. firstly with exhaust system complete, then removing by stages the fishtail, the swan neck, the silencer, forward horizontal pipe, front expansion box, the down pipe, and filnally the manifold. This would give us a very fair idea of which parts we have to attack. DA{Bernard Day - Chassis Design}/EV.{Ivan Evernden - coachwork} | ||