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).
Outlining necessary modifications and points of attention for the J.J. chassis and engine.
| Identifier | ExFiles\Box 179\3\ img061 | |
| Date | 15th March 1932 | |
| SECRET. ORIGINAL To Sg.{Arthur F. Sidgreaves - MD} From Hs.{Lord Ernest Hives - Chair} c. to Vor. c. to S. c. to By.{R.W. Bailey - Chief Engineer} J.J. Hs.{Lord Ernest Hives - Chair}1/WJ.15.3.32. X5770 Easter. It would appear that J.J chassis will be ready about Easter. It should be realised, however, that when we get hold of this chassis it will be very much out of date and it will not be worth running any distance until it has been modified. The following points we know need attention on the engine :- (1) Brackets for the rocker shaft need replacing. This will mean new cylinder head casting and other parts. (2) Facing on crankcase for fan bracket needs alteration. (3) With this type of construction we must have automatic tappets. This was anticipated from the start, but so far we have no designs. Automatic tappets is quite a common fitting to cars made in U.S.A. and we think before we do any serious running we ought to have them fitted to this engine. (4) The present friction damper will need to be redesigned. (5) The clutch as present fitted is unnecessarily expensive and we ought not to start this car off with this type of clutch. (6) Carburetters. At present we have only two single carburetters for this car. We think that from the point of view of general utility and cost, we shall have to fit a single carburetter. (7) The electrical equipment instructed for this car is more or less the present P.2 scaled down. We think the scheme is expensive, and is not free from trouble, and to start off with it on a new car which we hope has a number of years life is a mistake. (8) Central lubrication. The scheme instructed is the same as on present cars. We do not consider this is sufficiently reliable and it is unnecessarily expensive. This should be revised. | ||