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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).
Status report on the Big Bore 20/25 chassis, a reverse control modification, and the future programme for the Bentley Big Bore engine and supercharger.

Identifier  ExFiles\Box 30\1\  Scan272
Date  18th March 1935
  
- 6 -

Big Bore 20/25 (contd)

Department for the testing, so that everyone could see exactly what is being aimed at.

Material was, at this Conference, authorised for 200 chassis in "M" series.

GENERAL

Control for Reverse

A modification has been issued for this, which should get over the trouble previously reported.

GRY{Shadwell Grylls} Follow up

BENTLEY

Big Bore Engine - Future Programme

This is still in hand and is not yet completed. The car in France has now practically finished its 15,000 miles test, after which it will be returning to W. Troubles have been experienced with engine bearings, but every effort is being made to achieve satisfactory results in time for production. Solid ball metal bearings are being tried, i.e. without shells.

Supercharger

No further work is being carried out on this at the present time, but the possible use of a supercharged 6-cylinder Big Bore Bentley has not been lost sight of.
  
  


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