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).
Tests conducted on a rear silencer heat shield for Phantom cars to reduce interior overheating.
| Identifier | WestWitteringFiles\Q\2April1927-June1927\ 128 | |
| Date | 25th May 1927 | |
| To R.{Sir Henry Royce} from Hs{Lord Ernest Hives - Chair}/AJL. c. to BJ. Wor.{Arthur Wormald - General Works Manager} c. to E.{Mr Elliott - Chief Engineer} Da.{Bernard Day - Chassis Design} c. to BY.{R.W. Bailey - Chief Engineer} ORIGINAL. Hs{Lord Ernest Hives - Chair}/AJL1/LG25.5.27. X3808 X8830 X879 OVERHEATING IN THE INTERIOR OF PHANTOM CARS. Rear silencer heat shield, N.sch.2311. Tests have been carried out on the above scheme, designed to reduce the temperature in the rear compartment of enclosed bodies. The tests were carried out on 8-EX chassis fitted with a Barker limousine body. As a convenient basis of comparison the temperature of air entering the body via a series of holes drilled in the floorboards immediately above the silencer was noted during an hours' run at an average speed of 32 m.p.h. An exactly similar test was carried out without the heat shield (i.e. no lagging of any description on the silencer). The following results were obtained:- Average of a series of readings - heat shield fitted = 28°C " " " " " - no heat shield(std) = 36.25°C The outside air temp: during the tests was = 22°C Average engine water temperature = 80°C The decrease in temperature is very considerable and the improvement justifies its adoption as a std. fitting. The heat shield does not extend the whole length of the silencer owing to the presence of the N.S. draw-bar at the forward end. N.sch.2311 instructs lagging the top half of the silencer at this point; present standard cars are not fitted with lagging on the silencer at all, this having been deleted some time back. We have therefore contd :- | ||