| Description | Date | Identifier | |
| New shorter duration cam form for the Bentley valve gear. | 16th Dec 1936 | Box 88 \ 4 scan0195 | |
| Valve spring loadings and the use of a common spring for different engines. | 25th Jan 1937 | Box 88 \ 4 scan0196 | |
| Production and testing of non-surging, closely coiled valve springs for Bentley and Phantom III models. | 25th Jan 1937 | Box 88 \ 4 scan0197 | |
| Modifications to a valve lift indicator reed for a Bentley engine. | 25th Jan 1937 | Box 88 \ 4 scan0198 | |
| Proposing modifications to the Bentley Rockers valve gear to reduce cost. | 4th Feb 1937 | Box 88 \ 4 scan0199 | |
| Trial production and modification of Bentley Rockers. | 13th Feb 1937 | Box 88 \ 4 scan0200 | |
| The condition and wear of various engine valves after test-bed running. | 25th Feb 1937 | Box 88 \ 4 scan0201 | |
| Concluding memo noting the good condition and lower cost of the S.65 valves. | 25th Feb 1937 | Box 88 \ 4 scan0202 | |
| Engine valve failure and subsequent damage to a piston. | 17th Mar 1937 | Box 88 \ 4 scan0203 | |
| Sketch and report on a broken exhaust valve from a Bentley No 4 cylinder. | 17th Mar 1937 | Box 88 \ 4 scan0204 | |
| Broken No. 7 valve spring in the No. 4 cylinder exhaust, its replacement, and mileage. | 4th Apr 1937 | Box 88 \ 4 scan0205 | |
| The testing of Bentley valves for failures and cracks. | 6th May 1937 | Box 88 \ 4 scan0206 | |
| Broken Phantom III rocker shaft and a similar failure on a Bentley, chassis B.160.FB. | 4th May 1937 | Box 88 \ 4 scan0207 | |
| Investigation report into the failure of a Bentley rocker shaft. | 28th May 1937 | Box 88 \ 4 scan0208 | |
| Standardisation report on valve springs, comparing a new part with an old part. | 14th Jun 1937 | Box 88 \ 4 scan0209 | |
| Standardisation form detailing a production change for the 'M' Series chassis with no extra tool cost. | 16th Oct 1936 | Box 88 \ 4 scan0210 | |
| Modification notice for a Bentley 11 modified rocker arm, strengthening the oil hole section. | 23th Sep 1937 | Box 88 \ 4 scan0211 | |
| Standardisation of parts report for an inlet valve made from S.65 material. | 14th Oct 1937 | Box 88 \ 4 scan0212 | |
| Production note regarding the introduction of a part for the 'N' Series chassis with no extra tool cost. | 19th Oct 1939 | Box 88 \ 4 scan0213 | |
| The locking of a 5.B.A. location screw in the rocker shaft for Wraith Bentley & 30 HP models. | 31th Dec 1937 | Box 88 \ 4 scan0214 | |
| The endurance testing of different valve spring designs for a Bentley chassis. | 27th Jan 1938 | Box 88 \ 4 scan0215 | |
| Material change for Bentley valve springs to carbon wire. | 4th Feb 1938 | Box 88 \ 4 scan0216 | |
| Correct tappet setting for the 'M' Series Bentley, including recommended clearances. | 14th Jan 1939 | Box 88 \ 4 scan0217 | |
| Recommendation to adopt a .010' tappet clearance as standard for 'M' Series Bentley engines. | 26th Jan 1939 | Box 88 \ 4 scan0218 | |
| Requesting a sample set of wheels for the 'Bensport' Bentley 'B' model. | 16th Aug 1932 | Box 88 \ 5 scan0001 | |
| Wheel and tyre size specifications and clearance issues for the Peregrine & Bensport cars. | 13th Sep 1932 | Box 88 \ 5 scan0002 | |
| From Sg. to Hs. regarding Bensport, asking for the size of the road wheels. | 24th Jan 1933 | Box 88 \ 5 scan0003 | |
| The road wheel size for the BENSPORT car, stating it is the same as the Peregrine. | 24th Jan 1933 | Box 88 \ 5 scan0004 | |
| Supply lead time from Rudge Whitworth and Dunlop for hubs and wheels for the 3.5 Litre Bentley. | 8th May 1933 | Box 88 \ 5 scan0005 | |
| Expressing doubts about fitting Rudge-Whitworth wheels to the 3.5 litre Bentley and recommending Dunlop wheels instead. | 7th Jun 1933 | Box 88 \ 5 scan0006 | |
| The necessity for wheels on the 3.5 Litre Bentley to be able to be fitted with discs. | 7th Jun 1933 | Box 88 \ 5 scan0007 | |
| Decision to use Dunlop wheels for the first 200 3½ litre Bentley cars. | 9th Jun 1933 | Box 88 \ 5 scan0008 | |
| Decision to order Dunlop wheels over Rudge Whitworth wheels for the 3 1/2 Litre Bentley cars due to quality concerns. | 12th Jun 1933 | Box 88 \ 5 scan0009 | |
| Instructions regarding the production and ordering of Dunlop wire wheels and hubs for the 3.5 Litre Bentley. | 13th Jun 1933 | Box 88 \ 5 scan0010 | |
| Instruction to order 200 sets of Dunlop road wheels and hubs for the 3½ Litre Bentley. | 13th Jun 1933 | Box 88 \ 5 scan0011 | |
| Sourcing road wheels for a Bentley car from various suppliers. | 20th Jun 1933 | Box 88 \ 5 scan0012 | |
| Availability of sample 20 HP Dunlop and Bentley Rudge-Whitworth wheels for a discussion. | 20th Jun 1933 | Box 88 \ 5 scan0013 | |
| The design of dodecagon nuts for R.W. Wheels on a Bentley car. | 26th Jun 1933 | Box 88 \ 5 scan0014 | |
| Cover note for a chart showing the relative B.HP developed at the road wheels on a dynamometer for models 2-B-IV and B-23-AE. | 1st Jan 1934 | Box 88 \ 5 scan0015 | |
| Blueprint graph comparing Brake Horse Power against Engine RPM for two different engine configurations. | 29th Dec 1933 | Box 88 \ 5 scan0016 | |
| Experimental use of a metallization process on Bentley wire wheels from Rudge Whitworth. | 23th Jul 1934 | Box 88 \ 5 scan0017 | |
| Developments with Rudge-Whitworth Company regarding Aluminium Alloy rims for racing cars and a potential set for a Bentley chassis. | 23th Jul 1934 | Box 88 \ 5 scan0018 | |
| Letter discussing the development and fabrication of aluminium alloy rims for racing cars. | 2nd Oct 1935 | Box 88 \ 5 scan0019 | |
| Letter to Messrs. Rudge-Whitworth Ltd. requesting an estimate for producing a Bentley Hub Extractor. | 2nd Oct 1935 | Box 88 \ 5 scan0020 | |
| Blueprint for a Bentley Hub Extractor tool. | 29th Oct 1935 | Box 88 \ 5 scan0021 | |
| Internal request to make one portable Bentley Hub Withdrawal Tool. | 29th Oct 1935 | Box 88 \ 5 scan0022 | |
| Letter from The Bramber Engineering Company regarding the modification of wheels and proposing solutions. | 11th Aug 1936 | Box 88 \ 5 scan0023 | |
| Letter from Bramber Engineering Company Ltd. giving an assurance. | 11th Aug 1936 | Box 88 \ 5 scan0024 | |
| Letter discussing the design and fitting of wheel balance weights. | 14th Aug 1936 | Box 88 \ 5 scan0025 | |
| Letter from a tyre company discussing issues with wheel balance weights and clearances for Bentley wheels. | 14th Aug 1936 | Box 88 \ 5 scan0026 | |
| Letter from India Tyre & Rubber Co. suggesting Bramber make new wheels with provisions for balance weights. | 14th Aug 1936 | Box 88 \ 5 scan0027 | |
| Letter from India Tyre & Rubber Company regarding a wheel design issue from Bramber Engineering Company. | 14th Aug 1936 | Box 88 \ 5 scan0028 | |
| Letter from India Tyre & Rubber Company Ltd. discussing wheel manufacturing and proposing a revised design. | 14th Aug 1936 | Box 88 \ 5 scan0029 | |
| Letter to The India Tyre & Rubber Co. Ltd. concerning wheel spoking, balance weights, and tyre testing for a Bentley. | 19th Aug 1936 | Box 88 \ 5 scan0030 | |
| Letter from Dunlop Rubber Co. Ltd. regarding an issue with rims for the Phantom 111. | 19th Aug 1936 | Box 88 \ 5 scan0031 | |
| Letter from India Tyre & Rubber Company regarding the instruction to Bramber Engineering Co. to manufacture and ship wheels. | 20th Aug 1936 | Box 88 \ 5 scan0032 | |
| The despatch of a Phantom III Road Wheel to The Dunlop Rim & Wheel Co. Ltd. for inspection. | 21th Aug 1936 | Box 88 \ 5 scan0033 | |
| Letter to Dunlop Rim & Wheel Co. Ltd. regarding a Phantom III road wheel sent for inspection. | 21th Aug 1936 | Box 88 \ 5 scan0034 | |
| Letter to Dunlop Rubber Co. Ltd. regarding the dispatch of a 5.00 x 18' wheel for inspection. | 21th Aug 1936 | Box 88 \ 5 scan0035 | |
| Request to send balance weight bases for six wheels to Bramber Engineering Co. Ltd. | 21th Aug 1936 | Box 88 \ 5 scan0036 | |
| Letter from Dunlop Rim & Wheel Co. Ltd. confirming receipt and examination of a 5.00 x 18' road wheel. | 24th Aug 1936 | Box 88 \ 5 scan0037 | |
| Letter to The Bramber Engineering Co. Ltd. requesting five wheels after a successful sample test. | 31th Aug 1936 | Box 88 \ 5 scan0038 | |
| Letter from Bramber Engineering confirming an order to build five Rolls-Bentley wheels. | 1st Sep 1936 | Box 88 \ 5 scan0039 | |
| Letter to Dunlop Rubber Co. requesting a pair of modified experimental Bentley front wheels. | 7th Sep 1936 | Box 88 \ 5 scan0040 | |
| Querying the delivery of wire wheels for a 3 1/4 Litre Bentley following an invoice from the India Tyre & Rubber Co. | 15th Sep 1936 | Box 88 \ 5 scan0041 | |
| Requesting the booking in of ten 4.00 x 17 wire wheels for a 3 1/2 litre Bentley. | 16th Sep 1936 | Box 88 \ 5 scan0042 | |
| Letter from Dunlop Rubber Co. Ltd. confirming the delivery of two special Bentley wheels. | 17th Sep 1936 | Box 88 \ 5 scan0043 | |
| Request to issue a covering order to Messrs. Dunlop Co.Ltd. for two special Bentley Road Wheels. | 18th Sep 1936 | Box 88 \ 5 scan0044 | |
| Letter from Dunlop Rubber Co. Ltd. concerning out-of-pocket expenses for two special Bentley Road wheels. | 19th Sep 1936 | Box 88 \ 5 scan0045 | |
| Confirming the price of wheels mentioned in a previous reference. | 22th Sep 1936 | Box 88 \ 5 scan0046 | |
| Letter to Joseph Sankey & Sons Ltd. regarding a leaflet on Jordon Central Lock Wheels and an inquiry about using wire wheels with a short hub. | 29th Oct 1936 | Box 88 \ 5 scan0047 | |
| Wheel experiments comparing the cornering power and handling of different tyres and rims. | 18th Nov 1936 | Box 88 \ 5 scan0048 | |
| Bentley rear wheel arch and its potential application for project B.III. | 1st Dec 1936 | Box 88 \ 5 scan0049 | |
| The design of a Bentley rear wheel arch and its impact on the rear door entrance width. | 1st Dec 1936 | Box 88 \ 5 scan0050 | |
| The position of wheel experiments, comparing different tyres and rims. | 18th Nov 1936 | Box 88 \ 5 scan0051 | |
| Letter to Joseph Sankey & Sons Ltd. regarding drawings for central fixing road wheels. | 2nd Feb 1937 | Box 88 \ 5 scan0052 | |
| Follow-up letter from Joseph Sankey & Sons Ltd. regarding their suggestion to fit Central Type Wheels. | 29th Jan 1937 | Box 88 \ 5 scan0053 | |
| Chasing the return of faulty 'D' series Bentley Hubs for inspection by Dunlops. | 6th May 1937 | Box 88 \ 5 scan0054 | |
| Sending two worn Bentley drums and hubs with driving dog rattle for inspection. | 11th May 1937 | Box 88 \ 5 scan0055 | |
| The despatch of two Bentley Hubs to The Dunlop Wheel & Rim Company for examination. | 21th May 1937 | Box 88 \ 5 scan0056 | |
| Comparative cost analysis memo regarding the use of Hoffmann ball bearings versus Timken bearings for a Bentley front wheel hub. | 26th May 1937 | Box 88 \ 5 scan0057 | |
| Standardising 17 x 6.500 tyres on Bentley cars, noting it is not possible without increasing rear wheelarch clearance. | 16th Sep 1937 | Box 88 \ 5 scan0058 | |
| Request to post one aluminium wheel disc centre piece to Mr. Honeyman at Conduit St. | 19th Oct 1937 | Box 88 \ 5 scan0059 | |
| Cracked aluminium wheel disc centre piece after testing. | 19th Oct 1937 | Box 88 \ 5 scan0060 | |
| Modifications to the Bentley 11.A rear wheel arches to accommodate larger 6.5 x 17 tyres. | 18th Nov 1937 | Box 88 \ 5 scan0061 | |
| The despatch of four wheels and tyres for chassis B.117.JY. | 3rd Feb 1938 | Box 88 \ 5 scan0062 | |
| Laboratory examination of two chromium-plated parts for deposit thickness and porosity. | 21th Jun 1938 | Box 88 \ 5 scan0063 | |
| Design and fitment of a larger 22-gallon petrol tank for the Bentley 'B' model. | 16th Feb 1933 | Box 88 \ 5 scan0064 | |
| The petrol tank design for Bensport, discussing the use of a 16-gallon tank. | 24th Feb 1933 | Box 88 \ 5 scan0065 | |
| Required petrol tank size for the Bensport car, comparing it to the Peregrine and 20/25 models. | 27th Feb 1933 | Box 88 \ 5 scan0066 | |
| Petrol tank size for the Bensport model, recommending against a larger tank due to weight concerns. | 28th Feb 1933 | Box 88 \ 5 scan0067 | |
| Design, capacity, and modifications for the large petrol tank B.4. | 2nd Mar 1933 | Box 88 \ 5 scan0068 | |
| Issues with petrol surge and pump starvation in Bentley and Peregrine petrol tanks. | 29th Mar 1933 | Box 88 \ 5 scan0069 | |
| Alteration to the baffles of a Bentley petrol tank to improve fuel filling. | 20th Jun 1933 | Box 88 \ 5 scan0070 | |
| Fitting of a proper petrol tank to a 10,000-mile test chassis by modifying the coachwork. | 12th Jul 1933 | Box 88 \ 5 scan0071 | |
| Modification to a Bentley petrol tank following a complaint about filling difficulties. | 1st Aug 1933 | Box 88 \ 5 scan0072 | |
| Confirming the new Bentley petrol tank is a satisfactory improvement for production. | 3rd Aug 1933 | Box 88 \ 5 scan0073 | |
| Petrol fume issues in Bentley cars and proposing a revised tank breathing system. | 18th Sep 1933 | Box 88 \ 5 scan0074 | |
| Petrol tank ventilation to prevent fuel fumes from entering the car body. | 23th Sep 1933 | Box 88 \ 5 scan0075 | |
| Circulation of recommendations for petrol tank ventilation to coachbuilders. | 28th Sep 1933 | Box 88 \ 5 scan0076 | |
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