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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).
Technical memorandum regarding new cam forms, spring pressures, and valve lift curves for various car and aero engines.

Identifier  ExFiles\Box 13\2\  02-page016
Date  6th October 1928
  
47090
RG.{Mr Rowledge}
BY.{R.W. Bailey - Chief Engineer} from R.{Sir Henry Royce} and E.{Mr Elliott - Chief Engineer}
HS.{Lord Ernest Hives - Chair}
c. to BJ. Wor.{Arthur Wormald - General Works Manager}
R2/M6.10.28.
CAMS FOR F.{Mr Friese} H.{Arthur M. Hanbury - Head Complaints} and SS.{S. Smith} X.4003 X.5060
AND 20 HP. RE. BY2/G4.10.28. X.7090 X.3822
X.5090 X.4479
Any new cam forms for valves to be fitted
with 50/100% range of spring pressure should have middle
acceleration 25% inclination. We now think the 50%
tried in 'SS{S. Smith}' is too great for practical reasons.
The foot of the cam and clearance are less refined
on aero engines than on car engines, to ensure greater silence
in cars, and greater reliability in aero engines.
In reviewing the work in progress we understand
you are working out new curves of valve lift for the 'H'
engine to particulars given in E1/M30.5.28., and for the EAC.10
engine to E2/M30.8.28. This same information should also
be applied respectively to 'F' supercharged engines, and the
new 20 HP. chassis engines of improved performance.
R.{Sir Henry Royce}
  
  


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