Rolls-Royce Archives
         « Prev  Box Series  Next »        

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).
Investigating a high-pitched clicking noise from the valve gear at 1250 r.p.m. on experimental cars.

Identifier  ExFiles\Box 17\6\  Scan041
Date  19th May 1928 guessed
  
contd :- -2-

choc-a-bloc. The collars were turned back and the outers
were then made .075" longer.

Another complaint with these valves springs was
that at a speed of 1250 r.p.m. a loud high-pitched clicking
noise was set up from the valve gear. This noise was only
detectable at that speed, and vanished just below and just
above. It could be heard while running on the road, particularly
on the overrun, and was noticed on 14-EX, 15-EX and 17-EX.
Owing to the low bouncing speed, the double valve springs
on 17-EX were changed to single ones and the clicking disappeared.
We are unable to throw any light on this, and watching them
through the Ashdown Rotoscope (a kind of mechanical oscilloscope)
revealed nothing beyond the usual wild surging.


HS{Lord Ernest Hives - Chair}/S.S.Tresilian.
  
  


Copyright Sustain 2025, All Rights Reserved.    whatever is rightly done, however humble, is noble
An unhandled error has occurred. Reload 🗙