Letter regarding engine missing issues, with an attached mirrored copy of a report discussing suspension performance and 'gumptioning'.
| Identifier | ExFiles\Box 156\4\ scan0005 | |
| Date | 1st August 1921 | |
| X1211 We find that it is not practically possible to obtain an engine which will consistently run slow without occasionally missing, even when run on both ignitions. Yours truly, ROLLS-ROYCE OF AMERICA, Inc. Per M. {Mr Moon / Mr Moore} Olley MO/G ISCC: of August 1921 ISCC: C - 370 COPY Mr. Claude Johnson. Managing Director. Rolls-Royce Ltd., London, England. Attention: Mr. Royce & Works Committee. The effect of Mr Royce's suggestion in his letter of 18/5/21 has been that on cars which did not respond, "Gumptioning" is generally a good deal more successful. However, of fourteen test bodies, even the worst has been axled in consequence of their great weight. in a heavy car. SA-12 an improvement test which gave us an inkling of the necessity for "Gumptioning". As a basis not exceeding .004, a sheet also not exceeding .004. The practice of stone-in the ends of a post-war car has had as much as .050. Your springs has a very noticeable effect on rough roads and very often a lot of it is traced out in front of the car. running miles "Gumptioning". High speed does this "chumic". The springs are well bedded in. getting the state of the test 'rough-road' "Gumptioning". At slow speeds works back with a very light spring when fitted. is insufficient in these cases, and is more vivid in its movement than... The first car which was done up for chattering up the back end, was found to be practically perfect now. The drawing anticipates but it has been apparently good enough for some of the early cars at the high speeds... the re-bedding of the "gumptioning" on which do "gumption" when new. After a few hundred miles "gumptioning". in our experience, even when the... the above remarks apply only to springs of our type "chumic" which occur. | ||
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).