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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Piston ring leakage tests, noting issues with 'gumming' and equipment failure at high pressures.2nd Nov 1926Box 66 \ 1  scan0117
Graph showing 'New Phantom' piston leakage versus compression pressure at two different engine speeds.2nd Nov 1926Box 66 \ 1  scan0118
Blueprint of an apparatus designed for measuring gas leakage past pistons.6th Oct 1926Box 66 \ 1  scan0119
Test report on the effect of piston ring clearance on gumming in a standard Phantom engine.18th Nov 1926Box 66 \ 1  scan0120
Tests on piston ring gumming and the effect of groove clearance.19th Nov 1926Box 66 \ 1  scan0121
Piston gumming experiments testing the influence of stiff versus weak piston rings on a Phantom engine.19th Nov 1926Box 66 \ 1  scan0122
Page from a report detailing test conclusions on piston ring gumming tendency and oil passage.22th Nov 1926Box 66 \ 1  scan0123
Cure for gummed pistons by increasing the piston ring wall pressure.22th Nov 1926Box 66 \ 1  scan0124
Piston materials for aero and car engines, including trials of magnesium on the Phantom.22th Dec 1926Box 66 \ 1  scan0125
Outlining design points and recommendations for pistons in aero engines.22th Jan 1927Box 66 \ 1  scan0126
Issues with piston knocks, comparing different piston designs and outlining testing methods.1st Feb 1927Box 66 \ 1  scan0127
Piston knock issues and the testing of horizontally slotted pistons as a potential solution.23th Feb 1927Box 66 \ 1  scan0128
Blueprint of a piston with an additional sawcut for a Phantom model.23th Feb 1927Box 66 \ 1  scan0129
The performance and weight comparison of magnesium pistons fitted to a Phantom car.25th Feb 1927Box 66 \ 1  scan0130
Issues with Maxium pistons containing 10% copper, specifically their tendency to collapse and knock.28th Feb 1927Box 66 \ 1  scan0131
Performance and potential modifications of Phantom pistons, recommending further experimentation.28th Feb 1927Box 66 \ 1  scan0132
Piston design modifications for the Phantom engine to address knocking and improve performance.5th Mar 1927Box 66 \ 1  scan0133
Technical discussion on the issue of piston ring gumming due to increased clearances in reground cylinders.9th Mar 1927Box 66 \ 1  scan0134
Improvements for gummed pistons in aero and car engines.10th Mar 1927Box 66 \ 1  scan0135
Design of piston rings, including tapered, faked, and lapped rings, and their effect on oil consumption.1st May 1927Box 66 \ 1  scan0136
Failure of magnesium pedestal pistons and the need for a design alteration.18th May 1927Box 66 \ 1  scan0137
Investigation of inertia and temperature stresses in pedestal type pistons E.75540.18th May 1927Box 66 \ 1  scan0138
Design instructions and issues related to gummed pistons and car work.23th May 1927Box 66 \ 1  scan0139
Stress calculations and proposed modifications for pedestal pistons.1st Jun 1927Box 66 \ 1  scan0140
Defect in Phantom cylinder block castings and proposing corrective actions to eliminate piston knock.25th Jun 1927Box 66 \ 1  scan0141
Investigation into Phantom piston knocks caused by cylinder distortion, with proposed solutions.11th Jul 1927Box 66 \ 1  scan0142
Establishing standard dimensions for pistons for the 20-HP engine, including two diagrams.11th Jul 1927Box 66 \ 1  scan0143
Short typed note regarding investigations into the issue of Phantom piston knocks.15th Jul 1927Box 66 \ 1  scan0144
Discrepancy in blueprints for a modified cylinder head and piston for Blue Sports Chassis.16th Aug 1927Box 66 \ 1  scan0145
Operating temperatures of aluminium and cast iron pistons in petrol and diesel engines.6th Sep 1927Box 66 \ 1  scan0146
Machining operations for a Sports Phantom piston made of 'Y' metal alloy.10th Apr 1927Box 66 \ 1  scan0147
Test report on a Phantom engine investigating whether piston friction causes overrun vibrations.10th Oct 1927Box 66 \ 1  scan0148
Urgent memo requesting the modification of cases and pistons, and the production of new parts from sketches.15th Oct 1927Box 66 \ 1  scan0149
Modified design for a Sports Phantom Piston, referencing drawing LeC.2476.8th Oct 1927Box 66 \ 1  scan0150
Instructing the fitting of plain rectangular piston rings to Phantom chassis engines with honed cylinders.21th Oct 1927Box 66 \ 1  scan0151
Test results for car 14-EX fitted with 1400 lbs rear springs and modified hydraulic dampers.11th Nov 1927Box 66 \ 1  scan0152
Issues with 'Y' metal pistons and potential new designs for Phantom and Sports Cars.23th Nov 1927Box 66 \ 1  scan0153
Drawings for 'Y' metal pistons for models EAC.10 and 14.28th Nov 1927Box 66 \ 1  scan0154
Stiffener for piston LeC.2476 to address flexibility and rattling, with a discussion on material choice.28th Nov 1927Box 66 \ 1  scan0155
EAC.10 & 14 die-cast type pistons for production and sporting editions of the Phantom.29th Nov 1927Box 66 \ 1  scan0156
New cast aluminium piston design with 'H' webs as an alternative to a previous design.30th Nov 1927Box 66 \ 1  scan0157
Technical memo discussing the lubrication of the piston pin and suggesting modifications for experimental sets.9th Dec 1927Box 66 \ 1  scan0158
Modifications to the cross web piston design and lubrication system.13th Dec 1927Box 66 \ 1  scan0159
Prints of piston parts and instructions for their modification for Sports' Chassis.16th Dec 1927Box 66 \ 1  scan0160
Comparing 'Y' alloy with a proposed 'T50' alloy for use in forged aluminium pistons.19th Dec 1927Box 66 \ 1  scan0161
Testing of die-cast car pistons in Halls alloy for 20 HP and 40/50 models.1st Feb 1928Box 66 \ 1  scan0162
Production of 40/50 HP Sports Type chassis pistons as die castings and questioning the need for 20 HP pistons.3rd Feb 1928Box 66 \ 1  scan0163
Mechanical test results for T50 alloy forgings and casts, comparing them to 'Y' alloy and Duralumin.2nd Feb 1928Box 66 \ 1  scan0164
Laboratory report discussing die-cast piston materials and urging tests on new types of valve steel.1st Feb 1928Box 66 \ 1  scan0165
The metallurgical properties of experimental T50 alloy pistons compared to 'Y' alloy, with a note on 'Condor' valve failure.2nd Feb 1928Box 66 \ 1  scan0166
Comparing cross web and diagonal web piston designs, concluding the diagonal web is the superior design for car work.18th Feb 1928Box 66 \ 1  scan0167
Directive to change the material for piston pins from casehardened steel to a high-duty alloy steel.15th Mar 1928Box 66 \ 1  scan0168
Proposal to change the material for gudgeon pins and the associated concerns regarding wear and hardness.21th Mar 1928Box 66 \ 1  scan0169
The benefits of reducing lubricating grooves in aero and car engines.1st Mar 1928Box 66 \ 1  scan0170
Material composition of piston pins and recommending further fatigue testing.7th Apr 1928Box 66 \ 1  scan0171
Drawing for single bolt pedestal pistons with lower scraper rings for the Phantom and EAC.10.2nd May 1928Box 66 \ 1  scan0172
Heat treatment and hardness testing of various pistons.11th May 1928Box 66 \ 1  scan0173
Two compression ratios for the 40/50 engine and general chassis improvements.29th May 1929Box 66 \ 1  scan0174
Piston gudgeon pin distortion and proposing a series of tests to resolve it.31th May 1928Box 66 \ 1  scan0175
Telegram from Royce regarding a dangerous piston design, suggesting it be scrapped and replaced with a strengthened version.17th Jul 1928Box 66 \ 1  scan0176
Issue of piston knocks in engines, particularly when starting from cold.19th Jul 1928Box 66 \ 1  scan0177
Inquiry to The Automotive Engineering Co. Ltd. about the weight of BHB pistons for a 40/50 HP car.16th Oct 1928Box 66 \ 1  scan0178
Piston design, focusing on ring type, quantity, and manufacturing for various chassis.18th Oct 1928Box 66 \ 1  scan0179
Piston specifications and design modifications for Phantom and 20 HP models.18th Oct 1928Box 66 \ 1  scan0180
Cross-section drawing of a piston and connecting rod assembly with dimensional annotations.19th Oct 1928Box 66 \ 1  scan0181
Proposal to have the top of the piston eccentric with the skirt to keep the piston head axial with the cylinder centre line.19th Oct 1928Box 66 \ 1  scan0182
Layout drawing for Phantom chassis pistons, seeking approval before proceeding with detailed drawings.29th Oct 1928Box 66 \ 1  scan0183
Pistons seizing up in new 40/50 HP and 20-HP cars.24th Jan 1929Box 66 \ 1  scan0184
Pistons seizing on new cars and the need to establish a routine test.25th Jan 1929Box 66 \ 1  scan0185
Problem of seized pistons on new 40/50 HP and 20 HP cars.25th Jan 1929Box 66 \ 1  scan0186
Technical memo discussing seized pistons in New Phantom engines and proposing a modification to the starter carburetter.6th Feb 1929Box 66 \ 1  scan0187
Cover memorandum clarifying that the company is not working to finer limits on piston clearances, contrary to a recent suggestion.7th Feb 1929Box 66 \ 1  scan0188
Phantom piston seizures due to over-priming and the proposal to circulate a warning leaflet to owners.14th Jun 1929Box 66 \ 1  scan0189
Piston seizure and over-priming issues in Phantom cars, and the attachment of a new label.17th Jun 1929Box 66 \ 1  scan0190
Instructions and warnings for the use of the starter carburetter for cold engine starts.18th Jun 1929Box 66 \ 1  scan0191
Whether to issue a pamphlet regarding Phantom piston seizures.18th Jun 1929Box 66 \ 1  scan0192
Proposed trial of a new strutted piston design, referencing Chevrolet's success with a similar type.28th Aug 1929Box 66 \ 1  scan0193
Performance test sheet for component 46 P.R. E.A.C. IIE with the cut-out open.14th Aug 1924Box 66 \ 2  scan0001
Design changes for induction and exhaust pipes, referencing specific drawings and modifications to joints and heat jackets.23th May 1924Box 66 \ 2  scan0002
Secret memo regarding the design and drawings for an exhaust system, detailing a new silencer and a cut-out valve.31th May 1924Box 66 \ 2  scan0003
Secret memo regarding proposed modifications to an exhaust system, including the re-introduction of a front silencer.8th Sep 1924Box 66 \ 2  scan0004
Dispatch of a blueprint for an E.A.C.II. exhaust system.12th Sep 1924Box 66 \ 2  scan0005
Exhaust noise issues and potential modifications to the silencer system.23th Oct 1924Box 66 \ 2  scan0006
Redesign of the exhaust system for an E.A.U. engine to fit a sequence starter motor.29th Nov 1924Box 66 \ 2  scan0007
Design alterations for the 'V' series exhaust system.8th Dec 1924Box 66 \ 2  scan0008
Query regarding the possibility of removing the exhaust choke valve connected to the accelerator pedal.12th Aug 1924Box 66 \ 2  scan0009
The necessity of retaining the exhaust choke valve on the 'V' series chassis until distribution is improved.15th Dec 1924Box 66 \ 2  scan0010
Secret memo regarding the design of exhaust fittings and silencer brackets for the 'V' series.20th Dec 1924Box 66 \ 2  scan0011
Secret memo regarding the design and controls for the 'V' Series rear exhaust silencer and cut-out, with drawings sent for approval.7th Jan 1925Box 66 \ 2  scan0012
Secret memo discussing the design of a rear silencer support using sheet steel for 'V' series exhaust fittings.22th Jan 1925Box 66 \ 2  scan0013
Confirming a drawing has been made for an exhaust silencer bracket from Mr. Royce's sketch and a blueprint sent to him.22th Jan 1925Box 66 \ 2  scan0014
The power losses and modifications of an exhaust system.1st Feb 1925Box 66 \ 2  scan0015
The analysis of power losses due to the latest exhaust system.10th Feb 1925Box 66 \ 2  scan0016
The efficiency and condition of a silencer system after testing.10th Feb 1925Box 66 \ 2  scan0017
Alterations and performance tests of an exhaust system.10th Feb 1925Box 66 \ 2  scan0018
Diagram illustrating the components of the E.A.C. exhaust system.10th Feb 1925Box 66 \ 2  scan0019
Data table showing the loss of power due to the temperature of a hot spot at various RPMs.10th Feb 1925Box 66 \ 2  scan0020
Analysis of exhaust system power output with various parts, showing horsepower at the flywheel for different RPMs.10th Feb 1925Box 66 \ 2  scan0021
Table detailing HP loss at the flywheel due to specific system components at varying R.P.M.10th Feb 1925Box 66 \ 2  scan0022
Silencer experiments showing performance figures after system alterations.7th Feb 1925Box 66 \ 2  scan0023


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