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).
Noise issue with the exhaust heated hot spot on the Phantom II.
| Identifier | ExFiles\Box 19\3\ Scan099 | |
| Date | 16th November 1929 | |
| To R.{Sir Henry Royce} From Hs.{Lord Ernest Hives - Chair} c. Sg.{Arthur F. Sidgreaves - MD} c. Wor.{Arthur Wormald - General Works Manager} E.{Mr Elliott - Chief Engineer} c. Da.{Bernard Day - Chassis Design} Ey. x7772 Hs{Lord Ernest Hives - Chair}2/DA{Bernard Day - Chassis Design}16.11.29. X. 7080 X. 7230 X. 7772 EXHAUST HEATED HOT SPOT - PHANTOM II. We are in trouble with the scheme because when this is fitted we have not yet been able to overcome the noise from the exhaust passing through the hot spot. The noise appears to be due to the fact, we take the exhaust from one cylinder and a chuff of the exhaust passing through the hot spot can distinctly be heard under the bonnet. As we reduce this noise then we reduce the efficiencty of the exhaust heating. The noise can be heard even if we stop up the outlet from the exhaust heated bend, that is the exhaust squirting into the capocoty of the hot spot will make a noise which can be picked out. As the effect of the exhaust heated bend is going to be much more appreciated in U.S.A. than under our conditions, we took Mr. Olley out in an experimental car with the scheme arranged with the best compromise for noise and heat. He picked up the noise but considered that for their conditions they would prefer the exhaust heated bend with the noise rather than water heated. We wish to try one or two further schemes to reduce the noise because we should certainly get complaints if we add any additional noise. Hs.{Lord Ernest Hives - Chair} | ||