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).
Standardisation of parts for a modified throttle spring anchorage to prevent throttles sticking open.
| Identifier | ExFiles\Box 171\5\ img030 | |
| Date | 1st April 1938 | |
| RR. 758B (10H) (49968) 19/10/37 C.E.Co. COMPLETED 13.5.38. BENTLEY STANDARDISATION OF PARTS Date Issued 1.4.38. Sheet No. B.10. Drg. No. L.O.P.S. Description: MODIFIED THROTTLE SPRING ANCHORAGE. Purpose: To prevent throttles sticking open. Brief Report and Remarks: The return spring is reversed in direction, i.e. it pulls off in the opposite direction to the gas flow, balancing the effect of depression and consequent loading of the spindles. 3.B.IV. 6.B.IV. B.23.AE. B.50.LS. Satisfactory on experimental cars and was essential on Mr. E.R. Hall's racing Bentley B.35.AE which ran 4 years. List of alterations attached. The original scheme causes idling speeds to vary 1,000 r.p.m. When recommended for Introduction: IMMEDIATELY. Report References: 6/18.3.38. Rm{William Robotham - Chief Engineer}/IMW.{Ivan M. Waller - Head of Chateauroux} Chateauroux. By Rm{William Robotham - Chief Engineer} Da{Bernard Day - Chassis Design} Mx{John H Maddocks - Chief Proving Officer} By Rm.{William Robotham - Chief Engineer} Da.{Bernard Day - Chassis Design} Mx.{John H Maddocks - Chief Proving Officer} Table: Old Parts / New Parts Increase in Cost & NEGLIGIBLE. GKH 25/4/38 Decrease in Cost & NEGLIGIBLE. GKH 25/4/38 Production Position and Comments: Cost of Tools £ 3.10.0d. Modified throttle spring anchorage may be introduced at 1st. chassis in 'M' series (due to test 2.7.38.) but will involve scrap and correction of existing parts already instructed for 'M' series to a total value of £5.9.0d. Inlet pipes EB.2630 are already drilled for present type throttle spring bracket up to 78 in 'M' and require plugging, therefore, it will not be possible to remove the cast boss on these induction pipes which may evoke criticism on the score of appearance. The Factory cost of future chassis will not be affected by the new design, but new tools costing £3.10.0d. are required. RHC.{R. H. Coverley - Production Engineer} Authorisation to Proceed. Introduce on the 1st Chassis in M Series. Sg.{Arthur F. Sidgreaves - MD} [Signature] Hs.{Lord Ernest Hives - Chair} [Signature] Signature [Signature] Date 12/5/38 | ||