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).
Delivery spring tests for S.U. petrol pumps, detailing the particulars of three different springs.
| Identifier | ExFiles\Box 27a\2\ Scan242 | |
| Date | 4th September 1933 | |
| FILES: X26771. 4.9.33. S.U. PETROL PUMPS - HENSPORT. Hk.{Col. T. Harker - Sales} LAYOUT, PUMPS, FILTER & TAP ATTACHED TO BATTERY X MEMBER 5/16" DIA. PIPES THROUGHOUT. DELIVERY SPRING TESTS. The main particulars of the three springs used for these tests were as follows :- S.1. AS SUPPLIED WITH PUMPS. Dia. of wire .056". Free length .925" No. of coils 3½. 15 ozs. at .500" 1 lb. 11 oz. at .250" - 2.48 lb/in. rating. S.2. STRONGER SPRING SUPPLIED BY S.U. Dia. of wire .062". Free length 1.150" No. of coils 3½. 2 lb. 1 oz. at .500" 3 lb. 3 oz. at .250" - 3.54 lb/in. rating. S.3. STILL STRONGER SPRING - R.R. Dia. of wire .075" Free length 1.100" No. of coils 3¼. 2 lb. 14 oz. at .500" 4 lb. 8 oz. at .250" - 5.3 lb/in. rating. These were spiral springs, 1.100 inside diam. at small end, increasing to 1.700 outer diam. at large end. Of the tests taken with these springs, the following had the greatest significance in relation to the adaption of S.U. pumps to chassis. Z. DELIVERY WITH FULL Hk.{Col. T. Harker - Sales} SYSTEM, BUT WITH NO DELIVERY HEAD. S.1. DELIVERY 93 Pts/Hr. S.2. " 150 " S.3. " 150 " Y. DELIVERY & MAX. PRESS WITH FULL HK.{Col. T. Harker - Sales} SYSTEM INCLUDING 18" CARB. HEAD. S.1. DELIVERY 51 Pts/Hr. Max. Press - S.2. " 125 " " " 1.2 lb/sq" S.3. " 140 " " " 2.1 " | ||