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).
Carburettor and exhaust system issues and modifications on Goshawk-11 models.
| Identifier | ExFiles\Box 46\2\ Scan154 | |
| Date | 12th April 1922 | |
| To R/Hs.{Lord Ernest Hives - Chair} Le CanadelHenry Royce's French residence from EP.{G. Eric Platford - Chief Quality Engineer} c. to HY.{Tom Haldenby - Plant Engineer} c. to E.{Mr Elliott - Chief Engineer} c. to Wor.{Arthur Wormald - General Works Manager} c. to CJ. and BJ. c. to PN.{Mr Northey} c. to C c. to Rs.{Sir Henry Royce's Secretary} (for file) Handwritten: X4086 EP{G. Eric Platford - Chief Quality Engineer}1/LG12.4.22. 4-GOSHAWK-11. Handwritten: X4219 X4086 The following are a few points which may interest you in connection with your memo. re. the above ref. R/Hs{Lord Ernest Hives - Chair}/LG8.4.22. which we have received and circulated today, as requested. Carburetters. The carburetters on 5/6/7-Goshawk-11 have .625 venturi bore for high speed throat. We are now working on the carburetter on the Test Bed on the points which have been suggested in reports received from Le CanadelHenry Royce's French residence. Bronze throats instead of aluminum have now been instructed. We hope to embody all the possible improvements we can on 7-Goshawk-11 which will shortly be returned to the Works from the Coachbuilders, and which we propose to supply as the car for the Amateur 10,000 miles test and which we are now keeping back at the Works until it is satisfactory for this test. On 6-Goshawk-11 (the car Hy.{Tom Haldenby - Plant Engineer} is bringing to Le CanadelHenry Royce's French residence) we altered the pipe from the autovac to the float chamber so as to obtain a gradual fall. This matter has been taken up by the D.O. Exhaust. When testing 6-Goshawk-11, we considered the exhaust was particularly noisy and on taking down the silencer, we found that it had not been made to the latest instructions. The perforated pipes entering and leaving the silencer, had not been fixed. When this was done, the exhaust seem 100% better for quietness and did not appear to seriously affect the running of the car. This, however, can be confirmed in HY{Tom Haldenby - Plant Engineer}'s run to Le CanadelHenry Royce's French residence. We feel that 4-Goshawk-11 and 5-Goshawk-11 may also have this fault. The cut-out scheme proposed by you was actually adopted and used on the 1200 series of cars - drawing No. E.51., but was dropped when the low abolishing cut-outs came into existence. Our experience with this type of cut-out on cars on test, was that they very easily seized up and had to be given plenty of clearance and the clearance was such that a certain amount of rattle took place when riding over rough roads. Enquiries from the Repair Dept. reveal the fact that they find these cut-outs on cars which had come in for repair, had not been in use and had actually seized up in position, nor were they able to free same by working outside lever. This may have been due to the fact of them never having been used, as the control for this cut-out was fixed up to be connected to the body-work contd:- | ||