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).
Ignition coil performance and the effect of passing high tension cable through metallic tubes.
| Identifier | ExFiles\Box 52\3\ Scan345 | |
| Date | 14th November 1919 | |
| Contd. -3- out altogether, than it can be in the latter case. The former case corresponds to the high tension terminal being negative so that negative electrons would pass from insulated point to earth point. It is a curious fact that on the engine the direction of discharge that is less good on the bench, becomes the better of the two directions as regards mis-fires. Similar results to the above were obtained on the Remy coil, but we have no means of definitely saying that the directions of discharges from this coil corresponding to good and bad mis-fires were the same as for the R.R. coil, although there cannot be much doubt that this is the case. 2. Effect of passing high tension cable through iron and copper tubes of similar dimensions. Particulars of tests made by us as to whether there is any difference between the use of a magnetic and non-magnetic metallic tube through which the high tension wire has to pass were as follows:- Coil. R.R. standard. Running current reduced from normal (.92) to .87 amp. by insertion of resistance. Spark Gap. Special adjustable spark gap with platinum points. Gap in each case adjusted to max. distance which would allow of regular sparking. H.T. Cable. Length 6 ft. dia. over insulation .625" dia. of core .075". core consisting of 30/30's aluminium flex. Contd. | ||