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).
Investigation into petrol delivery variations in Autovacs, recommending a modification to the suction hole dimensions.
| Identifier | ExFiles\Box 40\4\ Scan215 | |
| Date | 2nd February 1927 guessed | |
| — because the amount of petrol delivered per stroke is four times that delivered by the standard autovac. VARIATION IN AUTOVACS. We have found considerable variation in the amount of petrol delivered by different standard type Autovacs. This we have been informed by the Autovac Coy is due to variation in the size of the suction and air inlet holes in the Autovac. Tests we have carried out confirm this statement. The average size of these holes is .100" diam.; by opening out the suction hole to .125" diam we have been able to increase the delivery under 3" of Mercury induction pipe depression, by 6 pints per hour (10%). We should stipulate to the Autovac Mfg Coy: that all units supplied to us be made to these dimensions. A Hiday | ||