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 from J.G. Vincent discussing engine idling, carburettors, vibration dampers, and chassis lubrication.
| Identifier | ExFiles\Box 127\1\ scan0147 | |
| Date | 10th December 1926 | |
| (2) Commander W. Briggs Rolls-Royce, Ltd. London. December 10th 1926. From my experience I would conclude that wherever this difficulty exists it is caused by a mixture that is unduly lean on the coast. Now as to the throttle position when idling I wish to advise that our throttle is slightly cracked because we idle through the main carburettor. Where a separate idling device is provided it is, of course, necessary to close the throttle as tightly as possible when idling. There are, of course, advantages to both types of construction. A slightly better idling can usually be secured with a separate idling device such as is used in the Zenith but there is liable to be a flat spot on the cross over from the idling device to the main carburettor. I am, of course, not familiar with your carburettor but I would suggest that you look for the cause in an extra lean mixture on the cost. Now as to the vibration damper it is, of course, true that the damper is more necessary on the Eight than on the Six because the Eight chassis is longer and tortional vibration is, therefore, bound to be greater. On the Six the shaft is much shorter and as it is very stiff it is quite free from tortional disturbance. I thank you very much for your kind remarks about the chassis lubricating system. I feel that this is one of the best devices that we ever built into a car and I have been surprised how well it functions. Usually when we install a new device we expect to receive some criticism, but the operation of the chassis lubrication system has been one hundred percent. As I am just back from Europe and snowed under with work I will have to cut this short. With kind personal regards and best wishes, I am Yours very truly, Sgd. J.G. Vincent, Vice-President of Engineering. JGV-UL. | ||