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).
Plug tests carried out on transport cars with carburetter modifications for fuel economy.
| Identifier | ExFiles\Box 162\3\ img179 | |
| Date | 29th February 1940 | |
| Elec. 6000 To Rm{William Robotham - Chief Engineer}/RC.{R. Childs} from Rm{William Robotham - Chief Engineer}/TAS.{T. Allan Swinden} c.c. Mr.Barkworth. Rm{William Robotham - Chief Engineer}/TAS.{T. Allan Swinden}1/MH.{M. Huckerby}29.2.40. PLUG TESTS ON TRANSPORT CARS. The following carburetter modifications have been carried out in order to test plugs under fuel economy conditions. In other words, the carburetters have been set to give maximum economy without loss of performance. when running on a new set of plugs. It is thought that after a time plug deterioration may be responsible for weakness on pick-up or misfiring, in which case the plugs will be examined by the Electrical Department. CHASSIS NO. 22.G.V. Speedometer reading 94479 Carburetter Serial No. 3201 R.{Sir Henry Royce} Main jet changed from .063 to .060 Bypass jet .030 Leather accelerator pump on short stroke. Champion LBB plugs at .025" gap replace FLB.30.X. CHASSIS NO. GAN.1. Speedometer reading 33094 Carburetter Serial No. 3620 R.{Sir Henry Royce} Main jet changed from .063 to .062 Bypass jet .030 Brass accelerator pump changed from short to long stroke. FLB.30.XP plugs on cyls. 1 to 5 ) replace FLB.30. FLB.30.X plug on cyl. No.6 ) All gaps .025" Rm{William Robotham - Chief Engineer}/TAS.{T. Allan Swinden} | ||