Rolls-Royce Archives
| Identifier | Entry | ||
| X 608 Carburetter-page01 | Induction system and carburation options for the Wraith model, referencing the 20/25 arrangement. | ||
| View original record | To E. c. to Nor. c. to By. x4209 608 He/Rn/7/KM. 26.9.34. WRAITH CARBURATION. We have been considering the various schemes of induction system which have been proposed for the Wraith. In our… | ||
| X 608 Carburetter-page02 | Carburetter system design, comparing performance and proposing system rearrangements. | ||
| View original record | -2- Hs/Rm.7/KW.26.9.34. Correcting for the compression ratio, changing from two carburetters directly on the induction pipe to one feeding from the block, dropped our output 6 H.P. or 7%. Measuring… | ||
| X 608 Carburetter-page03 | Graph comparing the performance of Bentley and 20/25 camshafts. | ||
| View original record | COMPARISON BENTLEY AND 20/25 CAMSHAFTS C.R. 6.5:1 (E.H. 66) PISTONS F.B. 1299 IN. VALVE .400 DIA EX. VALVE .300 DIA 2-1"5/8" S.U. CARBS ON 1500 PIPE A: BENTLEY CAMSHAFT BENTLEY INDUCTION SYSTEM B:… | ||
| X 608 Carburetter-page04 | Requesting the urgent production and fitting of a Wraith vertical piston double downdraught carburetter to a Buick engine for development. | ||
| View original record | To EY. Copy to Messrs. Hs. HMG. 608/4709 E/PSN.1/MN.3/1/35. U R G E N T. WRAITH. Vertical Piston Double Downdraught Carburetter. We send you herewith LeC 4187 showing the vertical piston double… | ||
| X 608 Carburetter-page05 | Modifications to the Wraith carburetter, specifically increasing the choke centres. | ||
| View original record | To D.Y. Copy to Mr. Hives. 46229 608 E/PSN.1/MN.12.4.35. WRAITH CARBURETTER. ------------------ We send you herewith LeC 4461 showing the modified double down-draught carburetter with increased choke… | ||
| X 608 Carburetter-page06 | Requesting detail drawings and the production of two experimental brass induction pipes for the Wraith. | ||
| View original record | To HPS. 608 Rm/CTS.1/JH.7.6.37. WRAITH. We send you herewith a scheme Sm.387 of an experimental induction pipe to suit the latest Stromberg carburettor(type A.A.25) Will you please make the necessary… | ||
| X 608 Carburetter-page07 | Suggested improvements for the Stromberg D.C.42 Carburettor on the Wraith model. | ||
| View original record | To Rm. c. to Rm/CTS. 608 Rm/GR.8/JH.9.7.37. Wraith. Stromberg D.C.42 Carburettor. The following improvements are suggested for the carburetter above and are applicable to 30 H.P. also. (1) Main feed… | ||
| X 608 Carburetter-page08 | Suggested improvements for the Stromberg D.C.42 carburettor on the Wraith and 30 HP models. | ||
| View original record | To Rm. c. to Rm/CHS. 608 Rm/GR.S/JH.9.7.37. Radcliffe. See me. Rm Wraith. Stromberg D.C.42 Carburettor. The following improvements are suggested for the carburettor above and are applicable to 30 H.P.… | ||
| X 608 Carburetter-page09 | Proposed modifications to the Wraith 'Stromberg' D.C.42 Carburetter for the 25/30 HP | ||
| View original record | P 608. on 1033. Mx. from Rm. Rm14/R.15.7.37. WRAITH 'STROMBERG' D.C.42 CARBURETTER. We are proposing to modify the specification of the standard 'Stromberg' D.C.42 Carburetter for the 25/30 H.P. in… | ||
| X 608 Carburetter-page10 | Instruction sheet regarding the carburetter for the Wraith III Chassis, section 5080. | ||
| View original record | 608. To: JDSW c. Hives c. Elliott c. Rm/Gry. c. Caslake c. Cox/Gry. c. G/RB. HY/C312/EH.30.9.37. Re Wraith III Chassis - Carburetter - Section 5080. 6 sets. In accordance with HY.1/VS.21.8.37., will… | ||
| X 608 Carburetter-page11 | Urgent request for a new pipe design for the Wraith induction system based on experimental data. | ||
| View original record | Ry. from Rm. 6P8 Rm3/R.9.12.37. WRAITH INDUCTION SYSTEM. The distribution of the induction system on the original Wraith was extremely bad. We have now got enough information from our experimental… | ||
| X 608 Carburetter-page12 | Tests and proposed improvements for the Wraith induction pipe. | ||
| View original record | To Rm. Rm/CTS.7/MH.9.12.37. WRAITH INDUCTION PIPE. We have got far enough with our tests on experimental pipes for the above engine, to give the necessary data, so that distribution can be… | ||
| X 608 Carburetter-page13 | Stress on throttle return springs for the Phantom III and 30 HP models. | ||
| View original record | To By. c. to EX/Scott. c. to Rm/GWH. Handwritten: 608 also 308 Rm/GR.10/JH.23.12.37. PHANTOM III & 30 H.P. Throttle return springs. With reference to Rm/GWH.3/EH.14.12.37. We certainly agree that the… | ||
| X 608 Carburetter-page14 | Proposed alterations to the Floatchamber Vent Assembly for the Wraith & 30 HP model. | ||
| View original record | 608 To Hy. c. to Ms. c. to RHC. c. to Da. Rm/GR.16/JH.6.1.38. WRAITH & 30 H.P. Floatchamber Vent Assembly Lec.3069. This assembly is still a very poor job and an expensive adoption for production.… | ||
| X 608 Carburetter-page15 | Requesting the creation of detail drawings for an experimental induction pipe for the Wraith III. | ||
| View original record | To By/Ald. from Rm/CTS. 608 Rm/CTS.1/MH.8.1.37. WRAITH III. From the attached sketch will you please make detail drawings so that an experimental induction pipe can be made. This design is following… | ||
| X 608 Carburetter-page16 | Parts changes for the Wraith III chassis, specifically for the induction pipe and carburetter. | ||
| View original record | 608 MEMO. c. Rm. Rm/GTS. BY/Ald.8/G.21.1.38. WRAITH III. CHASSIS. INDUCTION PIPE - SECTION 5070. CARBURETTER - SECTION 5080. Please receive herewith two blueprints of the following, with an extra… | ||
| X 608 Carburetter-page17 | Detail drawings for an experimental induction pipe and carburetter for the Wraith III chassis. | ||
| View original record | ToRm. from HPS. [Redacted] 608 HPS.2/EP.28.1.38. WRAITH III CHASSIS - INDUCTION PIPE & CARBURETTER. We have received detail drawings of an Experimental Induction pipe SCD.417, based on sketch Rm.489.… | ||
| X 608 Carburetter-page18 | Blueprints for Wraith III carburetter parts, the Throttle Spindle and Spring. | ||
| View original record | 608 BY/Ald.16/G.29.3.38. WRAITH 111. CARBURETTER - SECTION 5060. ------------------------- Please receive herewith two blueprints of the following :- Ex.S.636 Throttle Spindle 6 off. Ex.S.637 Spring… | ||
| X 608 Carburetter-page19 | Request to rivet levers to six Stromberg choke spindles, remove burrs, and nickel plate them for the Wraith model. | ||
| View original record | To HPS. from Rm/GR. 8 608- Rm/GR.2/MH.13.4.38. STROMBERG CHOKE SPINDLES (WRAITH). Will you please rivet levers to spindles EXS.636 remove all burrs and nickel plate complete, 6 off. Parts will be… | ||
| X 608 Carburetter-page20 | Analysis of carburetter flooding issues on the Wraith model. | ||
| View original record | COPY FOR FILES. WRAITH. 608. 20th. April 1938. Carburetter DC.42. High Pressure Pump. .113 needle seating. level set at .625. S.G. of fuel .743. Thrust reqd. at needle to destroy float buoyancy at… | ||
| X 608 Carburetter-page21 | Alternative Choke Relief Valve springs for the Wraith III carburetter. | ||
| View original record | [Stamped and crossed out text] HOG. C. Rm. GR. DR. 608 BY/Ald.8/G.26.4.38. WRAITH 111. CARBURETTER. SECTION 5080. Please receive herewith two blueprints of the following :- Ex.S.700 Spring - Choke… | ||
| X 608 Carburetter-page22 | Required modification to the air bleed on Wraith carburettors. | ||
| View original record | 608 Rm/GR. from Rm. c. Rm/Wym. Rm2/R.6.5.38. With reference to your report on Wraith carburettors, we note your remark that all carburettors require a modification to Rm.467 to the air bleed. Will you… | ||
| X 608 Carburetter-page23 | Report on installing an insulation washer under the carburetter. | ||
| View original record | 608 Ry. from Rm. Rm3/R.6.5.38. Attached report from Ratcliffe. While this demonstrates that there is obviously no urgency about putting the washer under the carburetter, we think that the drawing… | ||
| X 608 Carburetter-page24 | Tests concerning a Wraith carburetter insulation washer and engine mounting flooding issues. | ||
| View original record | To Rm. from Rm/GR. Rm/GR.2/MH.7.5.38. WRAITH CARBURETTER - INSULATION WASHER. Tests carried out with the above insulation washer show no improvement in starting when hot. Temperatures recorded show… | ||
| X 608 Carburetter-page25 | Modification Rm.467, transferring the carburetter air bleed to the choke body. | ||
| View original record | -2- All carburetters require a modification Rm.467, to the air bleed. At present the air to the idle system is taken direct from the floatchamber. This air bleed is now transferred to the choke body… | ||
| X 608 Carburetter-page26 | Graph plotting the temperature of a Wraith carburettor over time with different types of washers. | ||
| View original record | WRAITH CARBURETTOR TEMP WITH DIFFERENT WASHERS BETWEEN CARBURETTOR AND INDUCTION PIPE TEMP °C TIME - MINS INDUCTION PIPE (SAME IN EACH CASE) CARBURETTOR (THIN COPPER + ASBESTOS WASHER) CARBURETTOR… | ||
| X 608 Carburetter-page27 | Order for 6 insulation washers from the Cooper Joint Co. for testing on the Wraith. | ||
| View original record | To Roy. from Rm/GR. c.c. G/JWH. Rm/GR.9/JH.16.5.38. Will you please order from the Cooper Joint Co. 6 insulation washers to E.60695. These are for tests purposes on the Wraith in preference to the… | ||
| X 608 Carburetter-page28 | Modifications to the carburetter air intake connection for the Wraith III. | ||
| View original record | Noted [Signature] BY/SS. c. Rm. o. Em/GR. WRAITH File DA.8/C.27.9.38. 608 WRAITH 111 - CARBURETTER AIR INTAKE CONNECTION. Please receive herewith E.CD.687 Modified position for Air Intake Pipe Clamp -… | ||
| X 608 Carburetter-page29 | Decision to accept a known disability with Wraith carburettors over a flooding issue. | ||
| View original record | 608. By. from Rm. Rm6/R.8.6.38. WRAITH CARBURETTERS. At the moment we are accepting the disability mentioned in the attached memo as being preferable to the flooding trouble experienced by Sg. Rm. | ||
| X 608 Carburetter-page30 | Carburation flat spot issue on Wraith carburetters. | ||
| View original record | Y To By. from Rm/GR. c. HX. c. LA. Rm/GR.6/HH.9.6.38. WRAITH CARBURETTERS. With reference to the fuel level on the above carburetters. We wish to point out that with the .750" level agreed upon, there… | ||
| X 608 Carburetter-page31 | The testing of production and experimental carburettors for the Wraith model, detailing performance issues and proposed modifications. | ||
| View original record | 608 To By. c. to Is. c. to Mx. c. to Rm/Twdl. c. to Rm/Sym. Rm/GR.10/JDL.9.6.38. WRAITH CARBURETTERS. Four carburetters taken from the first batch of ten received by production were tested for power… | ||
| X 608 Carburetter-page32 | Performance data table for four production carburetters at various RPMs. | ||
| View original record | 060 MAIN 030 BYEPASS. 060 MAIN 036 BYEPASS. R.P.M. LOAD PTS/HR. AIR°C. LOAD PTS/HR AIR°C. 4000 43.3 48.5 36 43.3 49.3 33 3000 62 46 35 62.4 48 35 2000 74 36 36 74.5 36.5 35. 1000 80.6 20 37 79.7 20.2… | ||
| X 608 Carburetter-page33 | Performance data sheet comparing different carburettor setups and jet configurations. | ||
| View original record | EXP. GOOD CARBURETTER/STD. EXP. BAD CARBURETTER/STD. R.P.M. LOAD PTS/HR. AIR°C. LOAD PTS/HR AIR. 4000 42.6 51.8 40 43.5 50 39 3000 63.1 49.2 37 62 47 36 2000 75.7 37.3 38 73.2 35.5 36. 1000 82.5 20.4… | ||
| X 608 Carburetter-page34 | The modification of Wraith carburetters to correct the fuel level. | ||
| View original record | TO LA. from Rm/GR. Rm/GR.3/JH.5.7.38. WRAITH CARBURETTERS DC.42.T. Carburetters 5431T to 5442T inclusive and 5276ST require the fuel level correcting to .750". These were checked and modified by… | ||
| X 608 Carburetter-page35 | The replacement of a copper/asbestos washer with an insulation washer for the Wraith carburetter. | ||
| View original record | 608 To By. O. to O.O. Rm/GR.11/JH.5.7.38. WRAITH CARBURETTER. INSULATION WASHER. The above insulation washer EW.1810 has been found satisfactory as replacement to the original copper/asbestos E.60695.… | ||
| X 608 Carburetter-page36 | Suggestions to overcome the distortion of the floatchamber lid on a Wraith III carburetter when tightening the petrol drain pipe union. | ||
| View original record | 608 DR/JMS. c. Rm. S.P.R. A.F.S. WRAITH 111 - CARBURETTER. DISTORTION OF FLOATCHAMBER LID CAUSED WHEN TIGHTENING PETROL DRAIN PIPE UNION. A number of suggestions have been made to overcome the trouble… | ||
| X 608 Carburetter-page37 | Cost comparison between a standard carburetter with a separate sheet metal tray and a special carburetter with an integral cast tray. | ||
| View original record | - 2 - DA.17/G.7.7.38. We should, however, like the question of the cost of the standard carburetter with separate sheet metal tray compared with the special carburetter with integral cast tray, to be… | ||
| X 608 Carburetter-page38 | Instruction to alter the carburetter filter gauze mesh on part E.60579 for the Wraith and Phantom III models. | ||
| View original record | 608 also 308 To By/CS. from Rm/OR. Y Rm/OR.8/MH.13.7.38. CARBURETTER FILTERS ECD.137. Will you please alter the mesh of the filter gauze on E.60579 to 100/1" instead of 60/1". This applies equally to… | ||
| X 608 Carburetter-page39 | The incorrect fitting of the clamp bolt on the Wraith air intake bend. | ||
| View original record | To La. from Rm/GR. 608 Rm/GR.15/JH.14.7.38. WRAITH AIR INTAKE BEND. With reference to the clamp bolt on the above. This should be fitted at right angles to the choke spindle. Unfortunately a few of… | ||
| X 608 Carburetter-page40 | Distortion of the floatchamber lid on a Wraith III carburetter and proposing a solution. | ||
| View original record | 608 To Da. from Rm/GR. Rm/GR.15/JR.15.7.38. WRAITH III. Carburetter. Distortion of floatchamber lid. With reference to ECD.769, we do not think this will be very satisfactory in service. One assembled… | ||
| X 608 Carburetter-page41 | Special features and decisions for the Stromberg carburetter on the Wraith III model. | ||
| View original record | 608 BY. c. Rm. c. Rm/CTS. c. Rm/GR. c. Da/Mo.S. c. ROY/Loov DA.20/G.26.10.38. WRAITH III - STROMBERG CARBURETTER. Attached is a list of special features and the reasons for their inclusion in the… | ||
| X 608 Carburetter-page42 | Comparison of the Wraith III Stromberg carburetter against a standard version, detailing ten differences. | ||
| View original record | Da. Da/Mc.S.21/G.26.10.38. WRAITH 111 - STROMBERG CARBURETTER. With reference to the recommendations made in Rm/4/R.4.10.38. and Rm/CTS.6/R.6.10.38. re the bringing of the Wraith 111 carburetters… | ||
| X 608 Carburetter-page43 | List of modifications and standard features for the Stromberg carburetter. | ||
| View original record | - II - (11). Floatchamber lid suitable for application of overflow pipe in case of flooding, when used with electrical petrol pumps, in order to avoid risk of fire. The floatchamber lid must also have… | ||
| X 608 Carburetter-page44 | Design changes for future Wraith III carburetters based on an examination of a used unit. | ||
| View original record | 608 To Da & Rm c. to Bm/Cis. (crossed out) c. to Hw/GR. c. to De/WCS c. to Roy/Les. BY.27/N.4.11.38. Wraith III - Carburetter. Regarding the outstanding items awaiting decision, before ordering a… | ||
| X 608 Carburetter-page45 | Necessity of modifying the carburetter petrol drain pipes for the Wraith III, Series C production. | ||
| View original record | 608 DS/SS. C. Em. Op. EHS/EHS. DA.5/G.5.11.38. STD hLR/SD WRAITH 111 - CARBURETTER PETROL DRAIN PIPES. On E.CD.895 we show the petrol drain pipes from the induction pipe and carburetter carried just… | ||
| X 608 Carburetter-page46 | Proposal to eliminate the carburetter floatchamber vent on the Wraith III model to reduce costs, due to design changes that mitigate petrol vapourisation. | ||
| View original record | 608 WRAITH 111. CARBURETTER FLOATCHAMBER VENT. With reference to the proposal in Rm/CTS.6/R.4.10.38. re a simplified form of lamp post type breather for the carburetter floatchamber, we suggest that… | ||
| X 608 Carburetter-page47 | Instruction to fit ECD.895 drain pipes and a ball valve to Wraith III Units No.6 and No.10. | ||
| View original record | L08 To HPS/WSS. Rm/GR.12/JH.18.11.38. WRAITH III Units No.6 and No.10. Will you please fit ECD.895 drain pipes and ball valve to the above units. The alteration to the induction manifold may be… | ||
| X 608 Carburetter-page48 | Confirming modifications and a new price for the Wraith III 'C' Series carburetter supplied by The Zenith Carburetter Co. | ||
| View original record | To- Hy. c. to Du. c. to Rm. c. to Rs/OTS. c. to Rs/OR. c. to Ds/WCS. 608 ROY/Les.1/E.19.11.38. WRAITH III CARBURETTER Confirming the conversation we had yesterday, we are arranging with The Zenith… | ||
| X 608 Carburetter-page49 | Preliminary tests of a dual Stromberg carburettor on a Wraith engine, noting poor distribution and requesting drawings for modifications. | ||
| View original record | 608 abca 1033 To By/Ald. Rm/CTS.6/JH.13.12.38. DUAL CARBURETTER (STROMBERG). We have carried out preliminary tests on a Wraith engine, using the twin choke type AA25 carburetter, mounted on the mock… | ||
| X 608 Carburetter-page50 | Listing blueprints for Wraith III chassis inlet pipes and requesting the production of one set. | ||
| View original record | 608 HPC c. Rm. c. Rm/OTS. BY/A1d.3/C.14.12.38. WRAITH III CHASSIS. INLET PIPES - SECTION 5070. Please receive herewith two blueprints of each of the following :- Ex.S.1302 Induction Pipe Centre Body.… | ||
| X 608 Carburetter-page51 | The scheme and operation of the automatic choke control system for the Wraith model. | ||
| View original record | 608 To By. c. to Hn. c. to Du. c. to Mx. c. to Da/Jnr. c. to Da/Mc. Rm/TA.6/JH.11.1.39. WRAITH AUTOMATIC CHOKE CONTROL - Rm.579. The following scheme for automatic cold starting is at present fitted… | ||
| X 608 Carburetter-page52 | Description of the operation of an automatic choke and carburettor system under various engine conditions. | ||
| View original record | -2- In this condition the throttle is held open in a fast idle position by whichever of the three cams is most suitable. As the speed of the engine increases the vacuum line G from the induction pipe… | ||
| X 608 Carburetter-page53 | Temperature control using a thermostat in the cylinder head on a Bentley V. | ||
| View original record | -3- RM/TAT.6/JR.11.1.39. ature controlled by a thermostat in the cylinder head as on Bentley V and not solely by radiator shutters. Rm/G.Ratcliffe. Rm/T.A. Swinden. | ||
| X 608 Carburetter-page54 | Thermostatically operated choke for the Wraith model, including testing results and cost comparisons. | ||
| View original record | -4- THERMOSTATICALLY OPERATED CHOKE - WRAITH. The automatic choke control to Rm.579 has been running on 28.G.VI for about 5,000 miles without complaint. This includes a period of about one month when… | ||
| X 608 Carburetter-page55 | Owners Complaint Report No.1763 regarding the carburetter on chassis WXA.41. | ||
| View original record | 608 and 661 W/N - Br. Rm/GR.4/JH.3.4.39. Owners Complaint Report No.1763. Chassis No.WXA.41. Will you please inform the writer of the number of the carburetter in question and also quote this number… | ||