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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 using rollerless tappets and a new cam form for the Sports Phantom model.

Identifier  ExFiles\Box 66a\2\  scan0230
Date  17th September 1927
  
BY.{R.W. Bailey - Chief Engineer} Hs.{Lord Ernest Hives - Chair} from R.{Sir Henry Royce}

X8090
R4/M17.9.27.

RE. SPORTS PHANTOM.
X.8774
X.8090

We are proposing to use rollerless tappets
of 1" radius, same dia. of camshaft and lift and 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 circle with intersecting lines, marked with angles '3' and '45']

Probably use a few degress later. Will you
get your specialist working on this.

R.{Sir Henry Royce}
  
  


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