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).
Modifications to improve the ventilation of the Peregrine ignition distributor head following a 500-hour bench test.
| Identifier | ExFiles\Box 179b\2\ img196 | |
| Date | 3rd December 1932 | |
| To R.{Sir Henry Royce} from Hs{Lord Ernest Hives - Chair}/wst. C. SS.{S. Smith} Sor. C. E.{Mr Elliott - Chief Engineer} Da.{Bernard Day - Chassis Design} C. RV. Edy. ORIGINAL Hs{Lord Ernest Hives - Chair}/wst.3/ADS.12.32. PEREGRINE IGNITION DISTRIBUTOR X6119 The ventilation of the distributor head on the new Peregrine distributor was found to be inadequate, and after a bench test of 500 hours duration the metal parts rusted considerably. We have since tried experiments on the bench with the distributor modified, following discussion with A.{Mr Adams} sec K6/HFl.11.32. (1) A small extension bolted to the rotor in order to give a fanning action. (2) The two holes in the distributor head normally provided for ventilation, opened out .200". (3) The addition of two more holes of .200" dia. drilled in the distributor base. With this distributor, we carried out a bench test of 500 hours under standard conditions with a standard ignition coil, and we found a marked improvement in the condition of the metal parts inside the head. No rusting was apparent and no traces of nitrous-oxide deposit. We consider, therefore, that these modifications should be incorporated as soon as possible as they show definite improvements in the ventilation of the distributor. It might be possible to mould two small vanes on the inside of the "mushroom" high tension rotor instead of the one which we tried experimentally. This should prove an additional advantage. Hs{Lord Ernest Hives - Chair}/wst. | ||