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).
Proposal for a new cam form for the Sports Phantom using rollerless tappets.
| Identifier | WestWitteringFiles\Q\July1927-September1927\ Scan140 | |
| Date | 17th September 1927 | |
| (BY.{R.W. Bailey - Chief Engineer}) FROM R.{Sir Henry Royce} HS.{Lord Ernest Hives - Chair}) R4/M17.9.27. ORIGINAL re. SPORTS PHANTOM. (8774 / x8090 We are proposing to use rollerless tappets of 1" radius, same dia. of camshaft, and lift, & rockers. We want new cam form for such tappets to give valve lift curve equal to present exhaust -LeC.1882., but slightly long - viz: 57 divisions instead of 56, between the beginning and finish of the heavy acceleration - i.e. .013 clearance: this should give - [Hand-drawn diagram of a cam profile with angles marked '3' and '45'] Probably use a few degrees later. Will you get your specialist working on this. R.{Sir Henry Royce} | ||