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).
Letter discussing the effectiveness of the fuel additive Adcoid and its impact on engine pinking.
| Identifier | ExFiles\Box 146\1\ scan0240 | |
| Date | 21th April 1938 | |
| Sr.4/ET.21.4.38 - 2 - I presume they must after a few days), does it not occur to you that the Adcoid content of the petrol must at times be almost nil? In other words, when Adcoids are placed in the tank when filling up (it being presumed that there were no Adcoids at that moment) and say half the petrol is run off on the same day and the car only used again two or three days later; the first run will have been effected before the Adcoids had had time to dissolve and the second with double content of Adcoid in the petrol. However that may be and quite apart from these remarks which may be to our mutual interest, the power unit which we run with the addition of Adcoids in the petrol continues to give every satisfaction. In fact we have never had a unit that has gone so many miles without any signs of pinking. Hoping to hear from you in the near future, Yours faithfully, | ||