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).
The slow running performance and testing of a Daimler engine, comparing different carburettors and ignition components.
| Identifier | ExFiles\Box 126\4\ scan0038 | |
| Date | 1st August 1912 guessed | |
| Report on slow running of Daimler. Fitted with R.R. standard carburettor, also Polyrhoe using R.R. coil with the Bosch dual distributor. The slow running could not be got as even as the R.R.. Slowest running possible, late ignitions, rich mixture, this was not even running, it was missing badly but did keep running. Daimler. R.R. Carburetter Revs Revs. even running. slowest running even running Daimler 140 280 R.R. 140 280 160 Polyrhoe 130 260 150 The chief reasons for it not being possible to get this engine to run evenly, slow would be most probably caused by air being sucked up past the sleeves from the crankchamber, if any pressure was put into the induction pipe it could be plainly heard hissing past the sleeves (there was plenty of oil on them) Another proof was that the engine would run quite fast on the R.R. coil with the throttle in a position which would not run our engine at all, provingthat it was drawing air from elsewhere and being balanced by a rich mixture at the jet. Long reach plugs were tried with very little improvement, the advantage was slightly in their favour. One advantage they had was that they did not oil up so quickly. When the engine was firing irregular it shakes the car much W M 2897 100/11-17 | ||