Rolls-Royce Archives
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).
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DescriptionDateIdentifier
Performance graph comparing engine output based on different valve sizes, camshaft timings, and carburettor setups.24th Jun 1932Box 102 \ 5  scan0136
Graph showing the effect of increased valve lift on a standard camshaft and cylinder head.24th Jun 1932Box 102 \ 5  scan0137
Power curve graph for the 7983 c.c. 8-litre Bentley engine, comparing Bentley and R.R. timing.24th Jun 1932Box 102 \ 5  scan0138
Performance comparison chart of an 8 Litre Bentley and a 40/50 R.R.M. engine, showing valve timing and B.M.E.P.24th Jun 1932Box 102 \ 5  scan0139
Performance graph and valve timing diagrams for an E57177 camshaft on a 20/25 HP engine.24th Jun 1932Box 102 \ 5  scan0140
Tabulated list comparing valve opening specifications for various engines.10th Oct 1932Box 102 \ 5  scan0141
The design and performance of reduced toe camshafts for the J.III & China engines, including ideal timing diagrams.10th Oct 1932Box 102 \ 5  scan0142
Improving engine power output and speed by modifying camshaft timings and design for the J.1 and Phantom II models.10th Oct 1932Box 102 \ 5  scan0143
Performance graph and timing diagrams for the E57177 (112°) camshaft.10th Oct 1932Box 102 \ 5  scan0144
Graph comparing Brake Mean Effective Pressure (B.M.E.P.) against engine speed (R.P.M.) for two different tappet clearance settings.10th Oct 1932Box 102 \ 5  scan0145
Performance graph comparing a 110.5° camshaft and a 120° camshaft with different tappet clearances.13th Dec 1932Box 102 \ 5  scan0146
Outlining the handover schedule and development status for the Large Bore J.3 engine unit and its associated components.13th Dec 1932Box 102 \ 5  scan0147
Optimal timing for a new camshaft, part number E.82448 1140, including a timing diagram.13th Dec 1932Box 102 \ 5  scan0148
The design of the petrol pump and operating mechanism for the J.1. engine.24th Dec 1932Box 102 \ 5  scan0149
Estimate for a camshaft balancing scheme for the 20/25-HP model.18th Nov 1933Box 102 \ 5  scan0150
Issues with valve gear noise and potential solutions involving tappet adjustment and camshaft design.11th Dec 1933Box 102 \ 5  scan0151
Investigation into the source of Bentley tappet noise and the ineffectiveness of insulating the rocker cover to reduce it.11th Dec 1933Box 102 \ 5  scan0152
Analysis of valve and cam noise, comparing materials and measuring cam contours to determine quiet operating velocities.11th Dec 1935Box 102 \ 5  scan0153
Technical analysis of cam contours, clearances, and their effects on tappet noise and valve velocity.11th Dec 1933Box 102 \ 5  scan0154
Data table specifying maximum clearances and velocities for quiet cam operation.11th Dec 1933Box 102 \ 5  scan0155
Graph showing valve lift against crankshaft degrees for a Bentley cam toe.11th Dec 1933Box 102 \ 5  scan0156
Blueprint graph showing Bentley Cam Toes performance, plotting valve lift against crankshaft degrees for an exhaust cam.11th Dec 1933Box 102 \ 5  scan0157
Graph plotting valve lift against crankshaft degrees for a Bentley B7 Unit No. 2 Cylinder Inlet Cam.11th Dec 1933Box 102 \ 5  scan0158
Blueprint graph comparing the valve lift of two different Bentley exhaust cam toe designs against crankshaft degrees.12th Feb 1937Box 102 \ 5  scan0159
Graph showing Bentley cam base circle contours for Unit B7.12th Feb 1937Box 102 \ 5  scan0160
Graph of Bentley cam toe profiles, comparing valve lift and velocity for standard and suggested designs.14th Oct 1938Box 102 \ 5  scan0161
Standardisation of a balancing cam on the camshaft to cure timing gear rattles.2nd Nov 1933Box 102 \ 5  scan0162
Notification regarding the breakage of tappet springs on Bentley & 20/25 models.30th Jun 1934Box 102 \ 5  scan0163
Modifications to Balancing Cam for lubrication, hardened camshaft end play washers, and improved crankcase webbing.27th Apr 1934Box 102 \ 5  scan0164
Estimated cost for extra jigs, tools, and equipment for the 'F.2' series.5th Jun 1934Box 102 \ 5  scan0165
Comparison graph of Brake Mean Effective Pressure (B.M.E.P.) curves for Cadillac and Rolls-Royce products.13th May 1935Box 102 \ 5  scan0166
Request to manufacture a 25 HP camshaft with specific timing for slow running experiments.13th May 1935Box 102 \ 5  scan0167
Design flaw, a twist, in the 20 HP Bonnet and proposing a wooden scale model for review.27th May 1919Box 102 \ 6  scan0001
Design and modifications for the 20 HP bonnet and radiator, requesting a wooden model and prints.13th Jun 1919Box 102 \ 6  scan0002
Requesting alterations to the blueprint LeC.1104 for the 20 HP Bonnet & Radiator.28th Oct 1919Box 102 \ 6  scan0003
Drawing LeC.1198 for the 'Goshawk' water suction pipe and related chassis modifications.14th Feb 1920Box 102 \ 6  scan0004
Modifications to the 'Goshawk' Bonnet to accommodate an enlarged radiator and adjust the hinges.3rd Nov 1920Box 102 \ 6  scan0005
Proposed radiator and bonnet design for the Goshawk II engine.20th Jan 1921Box 102 \ 6  scan0006
Drawings for the Goshawk 11 bonnet and top radiator support, noting outstanding design decisions.1st Jun 1921Box 102 \ 6  scan0007
'Goshawk II' bonnet catch and associated drawing No. LeC.1403.9th Jun 1921Box 102 \ 6  scan0008
Design and placement instructions for the 'Goshawk II' bonnet catch.1st Jun 1921Box 102 \ 6  scan0009
Modifications to the Goshawk model's bonnet and radiator to differentiate it from the 40/50 model.2nd Jun 1922Box 102 \ 6  scan0010
Design alterations and compromises for the Goshawk bonnet, including radiator height and the fitting of louvres.9th Jun 1922Box 102 \ 6  scan0011
Proposed dimensional changes for the Goshawk bonnet and radiator, referencing drawing No. LeC.1595.16th Jun 1922Box 102 \ 6  scan0012
Modifications to a 3-Goshawk-11 limousine and its resemblance to the 40/50 model.19th Jun 1922Box 102 \ 6  scan0013
Mr. Royce's request to test a Goshawk limousine with a new dummy radiator and bonnet.20th Jun 1923Box 102 \ 6  scan0014
Selection and fitting of bonnet fastener springs for the 'Goshawk II'.12th Jul 1922Box 102 \ 6  scan0015
The policy for fitting thick leaf rear springs to new and existing cars.10th Aug 1922Box 102 \ 6  scan0016
Rust prevention treatments for the angle iron bonnet rest and mild steel brackets on the Goshawk-11 chassis.15th Sep 1922Box 102 \ 6  scan0017
Expecting the delivery of designs for a Generator Drive Brake and a Bonnet Fastener.11th Nov 1922Box 102 \ 6  scan0018
Standardisation of 'Goshawk II' lifting handles for the 40/50 chassis bonnet and their potential use on the 'R' Series.21th Nov 1922Box 102 \ 6  scan0019
From 'Hs' about tests on the Goshawk Bonnet, concluding that shutters are preferable to louvres for ventilation.23th Jan 1923Box 102 \ 6  scan0020
Adding louvres to the Goshawk and 40/50 bonnets to improve radiator cooling.23th Jan 1923Box 102 \ 6  scan0021
Issues with the top gear slipping out and bonnet fit, attributing the gear issue to faulty workmanship.26th Mar 1923Box 102 \ 6  scan0022
Car's water boiling during testing and questioning if this is expected behavior.23th Jul 1923Box 102 \ 6  scan0023
Requesting further information about a 20 HP engine overheating issue.26th Jul 1923Box 102 \ 6  scan0024
Faults found during a 10,000-mile test on a 20 HP production chassis, specifically a sticking air valve and bonnet fitting issues.27th Jul 1923Box 102 \ 6  scan0025
Follow-up memo arranging a reply regarding the 20-HP Chassis Louvres.18th Oct 1923Box 102 \ 6  scan0026
Standardisation of the screw fixing for bonnet strips on 20HP and 40/50HP chassis.24th Sep 1923Box 102 \ 6  scan0027
Proposal to fit sliding panels to the bonnet of a 20 HP car to address overheating issues.22th Jul 1924Box 102 \ 6  scan0028
Modifications to bonnet louvres, referencing Mr. Royce's preferences and Hispano designs.14th Jul 1925Box 102 \ 6  scan0029
Abandonment of a new bonnet clip design for Mr. Royce's car.14th Aug 1925Box 102 \ 6  scan0030
Seeking clarification on the design of louvred bonnets.28th Sep 1925Box 102 \ 6  scan0031
Technical memo discussing the design and pressing of louvres directly into the bonnet sheet.29th Sep 1925Box 102 \ 6  scan0032
Fitting the same type of louvres on the 20 HP bonnet as used on the 40/50 HP.18th Mar 1926Box 102 \ 6  scan0033
Sending a new louvred bonnet for a 20 HP model to London for evaluation and standardisation.12th Apr 1926Box 102 \ 6  scan0034
Standardisation of the louvered bonnet for the 20 HP model.29th Apr 1926Box 102 \ 6  scan0035
Standardisation document for modified louvres for the bonnet to improve appearance.12th Apr 1926Box 102 \ 6  scan0036
Modifications and standardisation of bonnet louvres for the 20-HP chassis.13th Jul 1926Box 102 \ 6  scan0037
Design for a 20 HP louvered bonnet with shorter louvres at the top.8th May 1926Box 102 \ 6  scan0038
History of bonnet catch springs for 20HP and 40/50HP chassis, seeking final approval for production.16th Jul 1926Box 102 \ 6  scan0039
Progress request regarding modified louvres to the bonnet for a 20 HP chassis.4th Aug 1926Box 102 \ 6  scan0040
Modified louvres for the bonnet of a 20 HP chassis.9th Aug 1926Box 102 \ 6  scan0041
Test report memo detailing issues found with a High Compression 20 HP car.1st Aug 1926Box 102 \ 6  scan0042
The delayed arrival of a new 20 HP louvred bonnet for inspection.3rd Nov 1926Box 102 \ 6  scan0043
Sending a 20 HP car with modified bonnet louvres for inspection and to deliver parts for Mr. Royce's car.8th Nov 1926Box 102 \ 6  scan0044
Sending a 20 HP car, model 11-G-111, to London with a modified louvred bonnet.10th Nov 1926Box 102 \ 6  scan0045
The superior appearance of shorter nearside louvres on the 20 HP car.12th Nov 1926Box 102 \ 6  scan0046
Improved appearance and standardization of louvres on bonnets.17th Nov 1926Box 102 \ 6  scan0047
Improvements to the Phantom throttle control and a proposal for standardising reduced-height bonnet louvres for the 20 HP car.18th Nov 1926Box 102 \ 6  scan0048
Standardisation of louvres in the bonnet to improve appearance.18th Nov 1926Box 102 \ 6  scan0049
The standardisation sheet for louvres in the bonnet of the 20 HP model.29th Nov 1926Box 102 \ 6  scan0050
Aesthetic design of radiators, bonnets, and frame height for cars.22th Dec 1926Box 102 \ 6  scan0051
Bonnet dimensions and the condemnation of a new radiator design due to its appearance.31th Dec 1926Box 102 \ 6  scan0052
Blueprint detailing the dimensions for four different bonnet series.30th Dec 1926Box 102 \ 6  scan0053
Design and improvement of bonnet fittings, clips, and locks for various car models.2nd Jan 1927Box 102 \ 6  scan0054
New bonnet lock schemes and lock barrel design for 40/50 and 20 HP models.1st Mar 1927Box 102 \ 6  scan0055
Design details of gear wheels, pins, and new bonnet fasteners, with references to sketches.6th Jan 1927Box 102 \ 6  scan0056
Design improvements for bonnet clips and overall bonnet aesthetics and dimensions.6th Jan 1927Box 102 \ 6  scan0057
Correcting a measurement for the 40/50 HP Bonnet and discussing appearance improvements.1st Nov 1927Box 102 \ 6  scan0058
Trial of a new bonnet lock and fastener design.22th Mar 1927Box 102 \ 6  scan0059
Deletion of rear shutters and bonnet louvres on Phantom & Goshawk models.1st Jul 1927Box 102 \ 6  scan0060
Modifications to the Phantom bonnet catch and a query on the 20 HP model.10th Sep 1927Box 102 \ 6  scan0061
Standardisation of chassis parts relating to a wider dashboard and bonnet to improve coachwork.10th Nov 1927Box 102 \ 6  scan0062
Standardisation form for chassis parts detailing testing and associated costs.19th Oct 1928Box 102 \ 6  scan0063
The failure of rivets on 20 HP Bonnet Side Strips, suggesting using larger and more rivets in the future.3rd May 1928Box 102 \ 6  scan0064
Alteration to increase the size and number of rivets on 20-HP bonnet side strips.7th May 1928Box 102 \ 6  scan0065
Standardisation of new dimensions for the 20.HP bonnet, radiator, and dash, following a proposal to Mr. Royce.15th May 1928Box 102 \ 6  scan0066
Standardisation of an improved appearance for the 20 HP model, including the bonnet, radiator and dash.19th May 1928Box 102 \ 6  scan0067
Modifications to the 20 HP improved bonnet, dash, and radiator.23th May 1928Box 102 \ 6  scan0068


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