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 operational issues of an Autopulse unit, detailing its inconsistent performance and noise levels.
| Identifier | ExFiles\Box 41\1\ Scan022 | |
| Date | 18th November 1926 guessed | |
| contd :- -2- Autopulse unit is expected to control the amount of petrol delivered to the float chamber, this is not sufficiently sensitive to ensure a constant speed. Under these con-ditions its failing is very pronounced, the pump should work perfectly regularly as it is called upon to supply a regular quantity of petrol, whereas it works spasmodic-ally - for short periods it delivers no petrol at all (the carburetter petrol level falling in consequence), and then suddenly it works vigorously to make up the leeway, in consequence of which the petrol level in the carburetter is suddenly raised to higher than normal correct level, before the pump ceases to work again. This produces very uneven carburation under light running conditions. The Autopulse pump is also extremely noisy in operation, this factor alone prohibiting its adoption as a standard accessory. HS{Lord Ernest Hives - Chair}/A.J.Lidsey. | ||