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).
Letter to Claude Johnson regarding tests on engine starting aids, including a choker scheme.
| Identifier | ExFiles\Box 20\6\ Scan052 | |
| Date | 5th March 1921 | |
| Cy4 - G 5321 March 5, 1921 Mr. Claude Johnson - Sheet 2. We have never had pre-ignition with this device. (3) Hot air taken through one exhaust box to the low speed jet alone has been tried by Mr. Hives during his visit. The effect, when a cold induction pipe was used, was not marked. Exhaust heat to the throttle was tried also, and was not in itself a solution of the difficulty. (4) The choker scheme has been tried on 4-EX with great success, and reported on in our letter of March 3 on "Ease of Starting". A sketch has also been sent to Mr. Hives of this device. The car with the choker can be started by hand with the greatest ease on a cold morning after a zero night, by simply filling with fairly warm water and notching the engine over 3 or 4 times. Yours truly, ROLLS-ROYCE OF AMERICA, Inc. Per M.{Mr Moon / Mr Moore} Olley COPY MO/G CC Mr. Nadin Mr. Bagnall Mr. Hulley Mr. Southern | ||