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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).
Test report summary on cylinder liner temperatures, the effects of oil cooling, and pre-ignition on an engine.

Identifier  ExFiles\Box 65\4\  scan0357
Date  12th October 1926 guessed
  
contd :- -5-

The chief thing this latter test proves is that
the cyl. skirts are cooled to a certain extent by the oil
spray as would be imagined.

SUMMARY.

(1) Up to the present after 39 hrs. running we have not
experienced any trouble with liners, pistons or rings on
this engine.

(2) The liner temperature is in excess of the alum.
cyl. temperature. At 1.5" from the top it is 21°C higher
at the speed of max. output giving 75 lbs/sq.in. B.M.E.P.

(3) Pre-ignition raises the liner temperature at 1.5"
from the top by 8°C. The pre-ignition was not violent.

(4) Reduced oil flow slightly raises the temperature
of the unjacketed cylinder skirt.

It is conceivable that with larger cylinders and
higher M.E.P's , the liner temperatures would be higher than
recorded during these tests and coupled with pre-ignition
could become considerably higher. Again, the amount of
shrinkage or 'fit' of the liners could possibly influence
the temperature.

On the first opportunity we intend to repeat these
tests on the Falcon X. with the dry liners.


Hs{Lord Ernest Hives - Chair}/A.C. Lovesey.
  
  


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