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).
Testing three types of spark plugs, and notes on brakes, shock absorbers, electrical system, and gearbox tests.
| Identifier | ExFiles\Box 1\4\ B001_X 100a-page064 | |
| Date | 23th November 1932 | |
| -2- Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}5/AD23.11.32 contd. Sparking Plugs We are sending out to you three types of sparking plug :- (1) K.L.G.734. This will probably preignite very nearly as badly as the L.K.S. 6 but we should like you to give them a run and report on them. (2) L.583. These are "hot stuff" K.L.G. plugs which may be too susceptible to fouling up for you to use. However, we should like you to try them. (These will follow as they have never had a bench test) (3) X.306. These are long reach "hot stuff" Lodge plugs which were found very satisfactory on test bed running. If you will report on these plugs fairly soon it will be useful to us. We particularly want you to bring the plugs back with you when the car returns to England as they will be useful for test bed work here and also for discussing with the manufacturers. Brakes. We note your remarks re brakes. We find that on our cars here the flexible type brake shoe requires 1" of lost pedal movement before the main shoe can be brought into contact with the drum. We think this is excessive and we should like you to experiment with what reduction can be made in this direction. You might try checking the flexible tip altogether at the rear and see if you run into brake squeaks. We are eliminating some of the spring in the rest of the system but it is not very much greater than that of the 25 HP. if the amount credited to the anti-squeak brake shoe is eliminated. You are using no more direct braking on your car with the lever you have fitted, than the standard 25 HP. and we should therefore like you to persevere and get the very best braking you can and report to us. We will let you have an analysis of the spring in the system elsewhere as soon as we have completed our tests. Shock Absorbers. All the points you mention are being dealt with. Electrical System. We have seen Wst. about this and are making every effort to get a better dynamo output. We wanted you to do a full throttle test on second speed for half a minute to see if the gear comes out and a similar test on bottom gear. Hs{Lord Ernest Hives - Chair}/Wst. | ||