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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).
The failure of exhaust valves on post-war 40/50 HP cars.

Identifier  ExFiles\Box 38\4\  Scan046
Date  1st August 1923
  
X3436
R.R. 493 (40 H) (SL 42 12-7-23). J.H., D.{John DeLooze - Company Secretary}
EXPERIMENTAL REPORT.
COPIES TO: RCJ WOR.{Arthur Wormald - General Works Manager} By E Da{Bernard Day - Chassis Design} EP{G. Eric Platford - Chief Quality Engineer} OY Hm{Capt. W. Hallam - Head Repairs}
Expl. No. X3436 X.2764
REF. Hsl/LG15. 8. 23.
OBJECT OF TEST.
To find cause and cure for failure of Exhaust Valves on post-war 40/50 H.P. cars.
TESTER.
A.{Mr Adams} C. Lovesey.
CONDITIONS.
Tests carried out on engine bench with standard 40/50 H.P. engine.
SUMMARY OF TEST.
A number of Exhaust Valves have failed on post-war cars. We have no record of similar failures on pre-war cars.
Tests show the reason why the pre-war valve is free from trouble is because the stem elongates only .0015" under full power compared with .009" on the post-war type valve under similar conditions.
We recommend we revert to the pre-war shape of Valve.
Hs.{Lord Ernest Hives - Chair}
  
  


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