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).
Design of contact makers for battery ignition and exhaust valves, comparing Delco and Bosch designs.
| Identifier | ExFiles\Box 35\6\ scan 240 | |
| Date | 31th January 1927 | |
| TO E.{Mr Elliott - Chief Engineer} F.C.) FROM R.{Sir Henry Royce} No. EH.) (At Le CanadelHenry Royce's French residence.) Copy to - EH. WOR.{Arthur Wormald - General Works Manager} X2894 R5/M28.1.27. DESPATCHED FROM WW. 31.1.27. X4041 X4652 X2894 X8680 BATTERY IGNITION. EXHAUST VALVES. CONTACT MAKER. diagram 30° - If this is off-set 30° does it not incline the [Diagram 1: Normal sine cure] [Diagram 2: Distorted ditto., SLOW MAKE, LIFT LOWER, EQUAL MAKE & BREAK, INCLINED 20° to 30°, FAST BREAK] RECEIVED STAMP: FEB 1 1927 You will remember that I suggested quicker break, slow make, might be an advantage, but intended that the cam should be so designed. E.{Mr Elliott - Chief Engineer} finds Delco and Bosch both off-set for same end. I have also suggested something the same about the valves - exhaust - to save burning and yet avoid noise. We must prevent the contact maker and the valve being thrown higher than the cam. You will see elsewhere that I have pointed out that an overthrow damping scrubbing spring could be fitted, thus - (believe we saw similar one in Watford magneto contact makers) X.8692 I rather like Bosch better than Delco, which has such a large piece of fibre to change its shape. (1) | ||