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
Oil consumption tests for the EAC engine, focusing on piston ring modifications.1st Mar 1925Box 66 \ 1  scan0017
Piston failure due to high engine speeds and potential design improvements.16th Mar 1925Box 66 \ 1  scan0018
Piston ring design to manage wear through unequal surface pressure.8th Mar 1925Box 66 \ 1  scan0019
Secret memo discussing drawings for piston modifications, including an experimental reinforced type.8th Mar 1925Box 66 \ 1  scan0020
Secret memo proposing to start a 10,000-mile test on car 93-NK with modified die-cast pistons for the EAC 'V' series.18th Mar 1925Box 66 \ 1  scan0021
Reducing engine oil consumption and smoke by fitting 'L' shaped piston rings.18th Mar 1925Box 66 \ 1  scan0022
Graph of oil consumption curves for an E.A.C. engine, comparing different piston and ring configurations.18th Mar 1925Box 66 \ 1  scan0023
Graph comparing oil consumption curves for an E.A.C. engine with different piston and ring setups.18th Mar 1925Box 66 \ 1  scan0024
10,000-mile test for the EAC 'V' Series, concerning piston modifications and vehicle testing.18th Mar 1925Box 66 \ 1  scan0025
Secret memo discussing proposed modifications to piston designs.18th Mar 1925Box 66 \ 1  scan0026
Secret memorandum with a diagram suggesting a modification to a piston design.19th Mar 1925Box 66 \ 1  scan0027
Confirmation of a wire with instructions for modifying a piston for multiple scraper rings.20th Mar 1925Box 66 \ 1  scan0028
Confirmation of a wire recommending the inclusion of Piston LEC. 2030 on the next ten thousand units.20th Mar 1925Box 66 \ 1  scan0029
Micro-examination and analytical report on a failed E.A.C. Piston.20th Mar 1925Box 66 \ 1  scan0030
Alterations to pistons, including ring stops, ring stiffness, and balancing.20th Mar 1925Box 66 \ 1  scan0031
Secret memo regarding an improved, strengthened piston with five oil-retaining rings.20th Mar 1925Box 66 \ 1  scan0032
Arranging a visit to Derby to inspect car 93-NK with the latest parts, including new pistons.1st Mar 1925Box 66 \ 1  scan0033
Authorisation sheet number 1 for the 'V' series regarding consent for a new piston.23th Mar 1925Box 66 \ 1  scan0034
Authorisation sheet for a 'V' Series piston modification and 10,000-mile test.23th Mar 1925Box 66 \ 1  scan0035
Patent claim for an 'L' section piston oil scraper ring, discussing its function and origin.23th Mar 1925Box 66 \ 1  scan0036
Piston design, oil consumption, and potential improvements for piston failures.23th Mar 1925Box 66 \ 1  scan0037
'EAC' engine overoiling issues, comparing them with 40/50 and 20 HP models.1st Feb 1925Box 66 \ 1  scan0038
Piston ring performance, oil consumption, and scraper ring design.25th Mar 1925Box 66 \ 1  scan0039
Adjustments to engine oil pressure and oil consumption test results.25th Mar 1925Box 66 \ 1  scan0040
Secret memo discussing various design suggestions for scraper rings and pistons.31th Mar 1925Box 66 \ 1  scan0041
Design of pistons, specifically scraper rings and piston pin size and fit.31th Mar 1925Box 66 \ 1  scan0042
'V' Series engine oil consumption, comparing the performance of new pistons against original designs and different oiling methods.1st Apr 1925Box 66 \ 1  scan0043
Confirming production status and component suitability for 'V' Series Pistons.2nd Apr 1925Box 66 \ 1  scan0044
Piston design approval following satisfactory oil consumption reports from France.3rd Apr 1925Box 66 \ 1  scan0045
Secret memo regarding the design and testing of a double ring piston.4th Apr 1925Box 66 \ 1  scan0046
Experimental, grooved piston ring stop suggested by Mr. Royce.8th Apr 1925Box 66 \ 1  scan0047
'V' series engine oil consumption, detailing tests with baffles and different piston ring configurations.8th Apr 1925Box 66 \ 1  scan0048
The performance of 'L' shaped rings and their relation to engine oil consumption.25th Sep 1924Box 66 \ 1  scan0049
'V' series pistons, detailing ring failures and oil consumption tests.15th Apr 1925Box 66 \ 1  scan0050
Piston ring design and its effect on oil consumption.15th Apr 1925Box 66 \ 1  scan0051
Comparing different piston and ring configurations, focusing on oil consumption and performance.1st Apr 1925Box 66 \ 1  scan0052
Experiments on piston designs and oil control methods.28th Apr 1925Box 66 \ 1  scan0053
Alteration of a conical top piston to incorporate a lower scraper ring for testing purposes.29th Apr 1925Box 66 \ 1  scan0054
Extract detailing proposed design changes to address excess oil consumption.29th Apr 1925Box 66 \ 1  scan0055
Extension of production for pistons and fabric couplings for the 'V' Series Chassis.30th Apr 1925Box 66 \ 1  scan0056
Oil consumption tests for 'V' series and Condor engine 'L' shaped piston rings.1st May 1925Box 66 \ 1  scan0057
The manufacture of 'V' Series Pistons, proposing an order for 100 more sets and considering an alternative to knurling.8th May 1925Box 66 \ 1  scan0058
Oil consumption issues related to 'L' shaped piston rings and the effects of lapping.13th May 1925Box 66 \ 1  scan0059
Production of 'V' Series pistons (E.73376) for the last 100 chassis.27th May 1925Box 66 \ 1  scan0060
The testing of magnesium pistons, detailing weight savings and cracking issues.12th Jun 1925Box 66 \ 1  scan0061
The investigation of 'knocks' on the Phantom chassis.1st Oct 1925Box 66 \ 1  scan0062
The investigation of piston knocks.12th Jun 1925Box 66 \ 1  scan0063
The causes of engine knock related to piston fit, oil film, and piston design.12th Jun 1925Box 66 \ 1  scan0064
Piston clearance, slap, and skirt flexibility.12th Jun 1925Box 66 \ 1  scan0065
Piston troubles discovered on the 'Phantom' model during test bench conditions.12th Oct 1925Box 66 \ 1  scan0066
Piston knocks, confirming the theory that a flexible skirt is required for silent operation.12th Jun 1925Box 66 \ 1  scan0067
The performance of standard pistons modified with a split skirt.12th Jun 1925Box 66 \ 1  scan0068
Piston modifications to improve flexibility and reduce knocking.12th Jun 1925Box 66 \ 1  scan0069
And comparing various piston designs, including a patented design with inclined stays.12th Jun 1925Box 66 \ 1  scan0070
Piston design, discussing gudgeon pins and composite materials.12th Jun 1925Box 66 \ 1  scan0071
Various solutions to resolve piston knock trouble in the Phantom engine.15th Oct 1925Box 66 \ 1  scan0072
Awaiting the results of piston modifications to prevent knocking and piston pin difficulties.18th Nov 1925Box 66 \ 1  scan0073
The production and testing of new die-cast pistons for the Phantom model.21th Oct 1925Box 66 \ 1  scan0074
Production approval for a 40/50HP Chassis Die Casting Piston E.73376.9th Dec 1925Box 66 \ 1  scan0075
The satisfactory testing of die-cast pistons to replace sand-cast pistons for the Phantom engine.11th Dec 1925Box 66 \ 1  scan0076
Oiling tests conducted on the Phantom model.1st Dec 1925Box 66 \ 1  scan0077
Oil feed experiments for the Phantom and Silver Ghost models to address over-oiling.12th Jun 1925Box 66 \ 1  scan0078
With graphs showing oil consumption on the Silver Ghost model versus oil pressure and oil flow rates.12th Aug 1925Box 66 \ 1  scan0079
Oil feed arrangements and their effect on oil leakage and consumption in main bearings.12th Jun 1925Box 66 \ 1  scan0080
Oil discharge in a Phantom engine comparing intermediate bearings with and without grooves.12th Jun 1925Box 66 \ 1  scan0081
Summarizing the factors that control engine oil consumption.12th Jun 1925Box 66 \ 1  scan0082
Reducing engine over-oiling through piston modifications and lubrication system design.12th Jun 1925Box 66 \ 1  scan0083
Endurance test of 'pedestal' type pistons for a Phantom engine, investigating fractures and 'piston knocks'.1st Apr 1926Box 66 \ 1  scan0084
Comparison between a standard pattern piston and a pedestal piston, discussing clearance, expansion and performance under load.1st Apr 1926Box 66 \ 1  scan0085
Comparison of mechanical efficiency and an investigation into piston knocks for pedestal pistons versus standard pistons.1st Apr 1926Box 66 \ 1  scan0086
Three experiments conducted to investigate and reduce engine knock.1st Apr 1926Box 66 \ 1  scan0087
Methods to eliminate engine knock by reinforcing the cylinder skirt with a steel sleeve.5th Oct 1925Box 66 \ 1  scan0088
Engine testing, focusing on cylinder skirt deflection and piston knocks.5th Oct 1925Box 66 \ 1  scan0089
Piston design theory, piston knock, and the failure of pedestal pistons during endurance testing.5th Oct 1925Box 66 \ 1  scan0090
Piston knock issues and potential solutions involving cylinder skirts.22th Apr 1926Box 66 \ 1  scan0091
Failure of a pedestal piston and proposing three ways to strengthen the design.22th Apr 1926Box 66 \ 1  scan0092
Modifications to the Phantom chassis, including steering, ignition, and pistons.18th May 1926Box 66 \ 1  scan0093
Design and experimental testing of three new piston types.18th May 1926Box 66 \ 1  scan0094
Different designs for Phantom engine pistons, with a requirement from Mr. Royce.19th May 1926Box 66 \ 1  scan0095
Engine 7-EX's performance after 8,600 miles, focusing on issues with exhaust firing, self-ignition, and carbon build-up.6th Apr 1926Box 66 \ 1  scan0096
Use of magnesium casting and Y-metal for crankcases and pistons.1st Jul 1926Box 66 \ 1  scan0097
Urgent need for magnesium copper and Y-alloy pistons, preferring cross-web designs over Zephyr types.7th Jul 1926Box 66 \ 1  scan0098
New spring ring device and other modifications for piston pins on various engines.1st Aug 1926Box 66 \ 1  scan0099
Test report on the performance of pedestal pistons, detailing a 32-hour run and discussing issues with piston knock.30th Aug 1926Box 66 \ 1  scan0100
Weight comparison between standard and pedestal pistons and a report on their operational testing.3rd Sep 1926Box 66 \ 1  scan0101
Manufacturing methods for special light pistons for the Phantom model, weighing sand casting against forging.3rd Sep 1926Box 66 \ 1  scan0102
Modifications to a Phantom pedestal piston made from forged magnesium.16th Sep 1926Box 66 \ 1  scan0103
Confirming Mr. Royce's agreement to use nickel steel for bolts in a pedestal-type piston.4th Oct 1926Box 66 \ 1  scan0104
Causes of gummed up piston rings, comparing issues found with aluminium versus cast iron pistons.6th Oct 1926Box 66 \ 1  scan0105
The causes of gummed-up piston rings, attributing it to gas leakage, and the development of an apparatus to measure it.6th Oct 1926Box 66 \ 1  scan0106
Modifying an apparatus for engine leakage tests and referencing a 1926 report on piston temperatures.11th Oct 1926Box 66 \ 1  scan0107
Causes of gumming pistons, comparing different lubricating oils, and suggesting testing methods.11th Oct 1926Box 66 \ 1  scan0108
Diagrams and charts detailing piston temperature analysis and a comparison between aluminum and cast iron pistons.12th Oct 1926Box 66 \ 1  scan0109
Tests for gas leakage past pistons and the apparatus devised to measure it.12th Oct 1926Box 66 \ 1  scan0110
Test report on engine air leakage measurement methods and results against varying RPM for a standard Phantom engine.12th Oct 1926Box 66 \ 1  scan0111
Engine leakage tests, noting variations and planning for improved testing methods.12th Oct 1926Box 66 \ 1  scan0112
Test report on the relative flexibility of pedestal pistons compared to the standard design.12th Oct 1926Box 66 \ 1  scan0113
Technical report on piston flexibility tests, including a blueprint diagram, a table of results, and analysis.14th Oct 1926Box 66 \ 1  scan0114
Piston leakage and proposing a change in testing methodology from various speeds to various pressures.14th Oct 1926Box 66 \ 1  scan0115
Tests to determine gas leakage past the pistons on a Phantom engine with various pressures.9th Nov 1926Box 66 \ 1  scan0116


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