Rolls-Royce Archives
| Identifier | Entry | ||
| X 607 Camshaft-page01 | Cam details in document LeC 4259, noting a modification to the follower radius. | ||
| View original record | TO SY. Copy to Hs. T&C. +C 789 607. E/PSN.2/MN.17/12/34. BRAITH. We send you herewith LeC 4259 showing the details of the cams for the above engine. It should be noted that the follower radius has… | ||
| X 607 Camshaft-page02 | Proposal to change the material of the tappet guides for the Wraith III camshaft balancer to reduce cost. | ||
| View original record | SECRET 607. To BY. Copy to AHS. Mr. Per. Mr. Dan. Mr. Hives. Mr. JS. Mr. TB. File F.Smith E/PBN.5/MN.24.3.37. Camshaft Balancer, Wraith III. The three tappet guides ER.1117 on the camshaft balancer… | ||
| X 607 Camshaft-page03 | Necessity and cost-saving potential of deleting the camshaft balancer on the Wraith III engine. | ||
| View original record | SECRET. To HPG. Copy to Mr: HY. Har. Par. Y.Out. S/Ldr. Handwritten: Files Good Camshaft Balancer - Wraith III. As the Wraith III is to have a Fabroil type of camshaft wheel there is some doubt as to… | ||
| X 607 Camshaft-page04 | Performance test figures for Wraith Cars 24.G.VI and 25.G.VI, including acceleration and hill climb times. | ||
| View original record | Rm. from Rm/Wym. 607 17.6.37. WRAITH CARS 24.G.VI. & 25.G.VI. Camshafts 24.G.VI. E.59919. 25.G.VI. Ex.24268. Performance test figures obtained from the above cars, both weighted to 1 ton 19 cwts. 2… | ||
| X 607 Camshaft-page05 | Experiment with a higher toe lift cam form with a reduced diameter base circle for the Wraith III engine. | ||
| View original record | URGENT. SECRET. To [redacted] Copy to Rm. [redacted] 107 E/PSH/AHP.2/M.25.6.37. CAM FORM WITH REDUCED DIAMETER BASE CIRCLE - WRAITH III. ------------------------------------------------ Following a… | ||
| X 607 Camshaft-page06 | Cam form modification with a reduced diameter base circle for the Wraith III engine. | ||
| View original record | URGENT. SECRET. 607. To HDO Copy to Remp Rm/Swdl. file E/PSN/AHF.2/M.25.6.37. CAM FORM WITH REDUCED DIAMETER BASE CIRCLE - WRAITH III. Following a discussion with Rm/Swdl. it has been decided to… | ||
| X 607 Camshaft-page07 | The required reduction in push rod length due to using Vauxhall cams on a Wraith III camshaft. | ||
| View original record | EXCRET. 607. To H.I.G. Copy to Mr Hales Mr Mr Rs/Swdl. E/PSH/ARF.1/M.26.6.37. CAMSHAFT WITH VAUXHALL CAMS - WRAITH III. ---------------------------- Further to our memo. E/PSH/ARF.1/M. 26.6.37,… | ||
| X 607 Camshaft-page08 | Camshaft with Vauxhall cams for the Wraith III engine. | ||
| View original record | SECRET [Handwritten Note] Reiler Swell - we should follow up. 607 [Initial: R] To H.S. Copy to Rm. Serr. By- Mr. Swab. E/PSH/AHP.1/H.26.6.37. CAMSHAFT WITH VAUXHALL CAMS. WRAITH III. We send you… | ||
| X 607 Camshaft-page09 | Camshaft with Vauxhall cams for the Wraith III, requiring a reduction in push rod length. | ||
| View original record | SECRET 607? To HJS. Copy to Hy. Rm. Dar Re/Desk R/PEN/AHF.1/M.26.6.37. CAMSHAFT WITH VAUXHALL CAMS - WRAITH III. --------------------------------------- Further to our memo. PEN/AHF.1/M. 26.6.37,… | ||
| X 607 Camshaft-page10 | Instructions regarding new drawings and blueprints for the Wraith III Chassis Camshaft, section 5090. | ||
| View original record | 607. C. Rn/Gry. Gardner Dr. H/CsH. Cr. Olley Haynes HY/CSL/SH.24.9.37. Re Wraith III Chassis - Camshaft - Section 5090. Please receive herewith blue prints of the following new drawings and L.C.P.,… | ||
| X 607 Camshaft-page11 | New spring-loaded thrust plunger for the camshaft on Wraith III and Bentley III models. | ||
| View original record | 607 BY/HS. C. H. DA.1/G.21.1.38. WRAITH 111 and BENTLEY 111 - SPRING LOADED THRUST PLUNGER FOR CAMSHAFT. Please receive herewith R.CD.402 Camshaft Spring Loaded Thrust Plunger - Wraith 111 and Bentley… | ||
| X 607 Camshaft-page12 | Confirming a verbal request regarding Wraith camshafts and the inclusion of an internal screw. | ||
| View original record | 607 To By/Ald. from Rm/Swdl. Rm/Swdl.8/MH.14.2.38. WRAITH CAMSHAFTS (EW.1416). This memo to confirm our verbal request for details to incorporate an internal screw to retain the camwheel centre piece… | ||
| X 607 Camshaft-page13 | Machining and modification of three Wraith III camshafts cast in 'Monikrom'. | ||
| View original record | To HPS. 607 Rm/Swdl.8/JH.15.2.38. WRAITH III CAMSHAFTS. We have 3 camshafts which have been cast in "Monikrom" by the Midland Cylinder Co. Will you please machine 1 in accordance with the drawing… | ||
| X 607 Camshaft-page14 | Design modifications for the camshaft driving gear for the Wraith III and Bentley III, specifically a version without the cam balancer. | ||
| View original record | WEALD C. to Rm. 607. Haler DA.6/9.17.2.38. WRAITH lll and BENTLEY lll. CAMSHAFT DRIVING GEAR WITHOUT CAM BALANCER. Please receive herewith E.CD.478 Camshaft Driving Gear without Cam Balancer - Wraith… | ||
| X 607 Camshaft-page15 | Blueprints for a Wraith III camshaft, an adapter, and a taper pin. | ||
| View original record | HPS. C. Rm. Mr.Swdl. 607 BY/Ald.9/G.17.2.38. WRAITH III. CAMSHAFT. SECTION 8090. Please receive herewith two blueprints of each of the following :- Ex.S.491 Camshaft 1 off. Ex.S.492 Adapter for… | ||
| X 607 Camshaft-page16 | Calculations for the Wraith III camshaft balancer, detailing torque values at different speeds. | ||
| View original record | Rm. [Initials: PHH] [Signature] BY/B.15/G.S.4.38. CAMSHAFT BALANCER - WRAITH III. 607. The results of calculations made on the above are shown in the Table below. It will be seen that at high speeds… | ||
| X 607 Camshaft-page17 | Calculations of torque on the camshaft for a Wraith III engine, with and without a balancer. | ||
| View original record | Rm. --- 607. BT/B.15/G.8.4.38. CAMSHAFT BALANCER - WRAITH III. The results of calculations made on the above are shown in the Table below. It will be seen that at high speeds (4,500 r.p.m) owing to… | ||
| X 607 Camshaft-page18 | Ineffectiveness of the Wraith cam balancer and related timing gear wear. | ||
| View original record | Es. from Em. c. HY. c. HEC. c. Ds. c. MX. c. LA. 607. Rm/S/R.13.4.38. WRAITH CAM BALANCER. The Wraith timing gears only wear badly at high speeds. It can be shown mathematically (Rm/FWM.4/M.11.4.38.… | ||
| X 607 Camshaft-page19 | Recommendations on fitting a cam balancer to the first 100 Wraith cars, addressing gear rattles and crankshaft oscillations. | ||
| View original record | -2- RM8/R.13.4.30. In view of the foregoing, our recommendations are that the cam balancer, which costs, approximately, 50/-, should not be fitted or produced for the first 100 Wraith cars, though we… | ||
| X 607 Camshaft-page20 | Correcting a material specification (S/LXX) and Brinell hardness for Wraith camshaft gears. | ||
| View original record | 607. EY.30/G.26.4.38. WRAITH - CAMSHAFT GEARS. With reference to my memo EY.7/G.26.4.38. in connection with the above, the material I quoted was incorrect and should have read S/LXX. with the Brinell… | ||
| X 607 Camshaft-page21 | Decision to use uncarburised soft steel for Wraith camshaft gears based on wear testing. | ||
| View original record | 607. BY/C.7/C.26.4.38. D/J.W. (Struck through) M. W/Shop (Struck through) C. Rm. (Struck through) WRAITH - CAMSHAFT GEARS. In view of the fact that the soft steel gears do no show any signs of wear… | ||
| X 607 Camshaft-page22 | History and necessity of the camshaft balancer for the Wraith model, referencing issues with the 20/25 HP engine. | ||
| View original record | To (MR.) From MR. H.I.C. C. to Sg. Hs. By. C. to Da. MX. La. 607 RHU.1/MJ.27.4.38. WRAITH CAMSHAFT BALANCER. With reference to Rm.S/13.4.38 our impression is that the Camshaft Balancer was originally… | ||
| X 607 Camshaft-page23 | Adoption of a slipper drive to eliminate engine gear rattle and reduce costs on the Wraith engine. | ||
| View original record | -2- RHO.1/WJ.27.4.38. Cont'd. Whilst it is admitted that the general conditions of Ph.lll engine are different and the crankshaft is more rigid, we did have some trouble with engine gear rattle on the… | ||
| X 607 Camshaft-page24 | Copy of a previous communication regarding a Wraith Camshaft Balancer. | ||
| View original record | Miss Reece. 607. Please send Sg a copy of this Rm ✓Rm/Rs S/W To Rm. from Sg. re Wraith Camshaft Balancer. Sg1/E28.4.38 Would you kindly let me have a copy of your Rm8/13.4.38 which is mentioned in… | ||
| X 607 Camshaft-page25 | Covering memo regarding the Wraith Camshaft Balancer, attaching a copy of a previous document. | ||
| View original record | 607. Eg. from Rm. RmS/R.29.4.38. re: Wraith Camshaft Balancer. Sg1/2.28.4.38. As requested we attach a copy of RmS/R.13.4.38. Rm. | ||
| X 607 Camshaft-page26 | Ineffectiveness of the Wraith cam balancer in relation to timing gear wear and low-speed rattle. | ||
| View original record | 607. COPY. Hs. from Hm. c. Ry. c. RBC. c. Da. c. Mx. c. LA. Rm8/R.13.4.38. WRAITH CAM BALANCER. The Wraith timing gears only wear badly at high speeds. It can be shown mathematically (Hm/PJH.4/MH.… | ||
| X 607 Camshaft-page27 | Recommendations on whether to fit a cam balancer to the first 100 Wraith cars, discussing potential wear at high revs. | ||
| View original record | -2- RmS/R.13.4.38. In view of the foregoing, our recommendations are that the cam balancer, which costs, approximately, 50/-, should not be fitted or produced for the first 100 Wraith cars, though we… | ||
| X 607 Camshaft-page28 | The wear of Wraith timing gears. | ||
| View original record | To Hs. from Rm/FJH. c. By. c. RFC. c. Da. c. MX. c. GWH. c. De/Jnr. c. Rm/wym. WRAITH TIMING GEARS. We give below the information we have obtained so far on the wear of Wraith timing gears. At the… | ||
| X 607 Camshaft-page29 | Investigation into sheared distributor driving pins and gear wear in the timing gear drive, comparing different materials. | ||
| View original record | -2- Rm/FHH.4/WH.11.4.38. of balancing cam plungers and we attach a print of these curves. These curves show that the camshaft balancer has a negligible effect at high speeds and may even be a… | ||
| X 607 Camshaft-page30 | Test report logging running time, mileage, and backlash measurements for nine different component units. | ||
| View original record | UNIT NO. RUNNING TIME HOURS ON TEST BED. MILES ON CHASSIS. WITH OR WITHOUT BALANCING CAM. MOULDED OR SHEET FABROIL. HELIX ANGLE. APPROX. ORIGINAL BACKLASH. APPROX. FINAL BACKLASH. 1. 150 hrs. at 1000… | ||
| X 607 Camshaft-page31 | Investigation report on the timing gears of the Wraith III, focusing on camwheel wear and rattle. | ||
| View original record | 12th April, 1938. WRAITH III TIMING GEARS. This report is further to our original memo Rm/Swdl. 4/JH.19.1.38. and written in view of the wear of the Fabroil camwheel and rattle which has developed on… | ||
| X 607 Camshaft-page32 | List of tests to investigate crank oscillations, camwheel wear, and rattles on Wraith III and Bentley II models. | ||
| View original record | -2- 12th. April 1938. Tests will include :- (a) Comparison of crank oscillations also camwheels on Wraith III and Bentley II or 25/30. (b) Trial of new camwheel material to reduce wear. (c) By timing… | ||
| X 607 Camshaft-page33 | Graph showing the camshaft torque for the Wraith III engine at 4500 RPM. | ||
| View original record | WRAITH III CAMSHAFT TORQUE SPEED 4500 R.P.M. FRICTION NEGLECTED TORQUE DUE TO BALANCER INERTIA AND SPRINGS ONLY TORQUE DUE TO VALVE INERTIA VALVE SPRINGS, GAS PRESSURE WITHOUT BALANCER CAMSHAFT ANGLE… | ||
| X 607 Camshaft-page34 | Request to manufacture an indicator drive for a Bentley II camshaft, referencing a previous one made for a Wraith III camshaft. | ||
| View original record | 607? To HPS. from Rm/Swdl. Rm/Swdl.4/MH.16.6.38. SUMNER'S TORSIONAL INDICATOR. Will you please make an indicator drive to suit driving the above off a Bentley II camshaft in a similar manner to the… | ||
| X 607 Camshaft-page35 | Modifications to tappets and push rods for the Wraith III and Bentley III engines. | ||
| View original record | Sales EX/HS [Redacted] C. Rm. [Redacted] T. Raydon [Redacted] DA.10/G.13.7.38. 607. WRAITH III and BENTLEY III. TAPPETS AND PUSH RODS. Please receive herewith blueprints of E.CD.795 Modified Camshaft… | ||
| X 607 Camshaft-page36 | Balancing of the cam driving wheel for the Wraith III and Bentley III models. | ||
| View original record | 604 DD/LC C. Rm. Cr. H.S./Derby DA. 10/9/38. DA.10/G.S.9.38. Files Study WRAITH 111 - BALANCING OF CAM DRIVING WHEEL. Please receive herewith :- E.CD.880 Increased Inertia Camshaft Wheel with Balance… | ||
| X 607 Camshaft-page37 | Instruction to add two 1.000' diameter holes to the camshaft wheel for the Wraith III and Bentley III to allow for bearing adjustment. | ||
| View original record | 607 [Strikethrough text] Mr/Luc. [Underlined text] c. Rm/Swdl. [Strikethrough text] c. SD/SS. (Handwritten) Sales DA.10/S.8.9.38. (Handwritten) Sue for Noting WRAITH III - BALANCING OF CAM DRIVING… | ||
| X 607 Camshaft-page38 | Requesting the trial fitting of a non-chamfered camwheel on a Wraith B.III unit and other new units. | ||
| View original record | c. Rm/Wym 607. To HPS. from Rm/Swdl. Rm/Swdl.4/MH.30.9.38. WRAITH CAMWHEEL EW.1880. B.III No.1 unit will shortly be returned to the shop for fitting a new camshaft. At the same time will you please… | ||