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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).
Engine cooling circulation issues, radiator choking, and potential solutions.

Identifier  ExFiles\Box 15\1\  Scan197
Date  10th January 1930
  
-4- Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}3/MJ10.1.30 contd.

standard (Graph 4 and 1 Hs{Lord Ernest Hives - Chair}/AJL1.9.1.30). These show
that the circulation cannot be reduced very much. They
also show than any such restriction must not be put on the
far side of a rubber connection as the back pressure built
up is over 20 lbs/sq.in. at high engine speeds (Graph 2.
Hs{Lord Ernest Hives - Chair}/AJL1.9.1.30).

we
A phenomenon was observed on Mr.Short's car,
an F2B. series with choked radiator, was that water was
thrown out of the steam pipes when the engine was "reved"
up even with the water cold. His radiator was a
particularly bad case of choking up, but we have been able to
reproduce the same trouble by artificially obstructing the
top row of tubes on one of our own cars. Apparently the
pump is able to create a partial vacuum in the centre of the
radiator and push the excess of water so obtained into the
top tank where there is no room for it. A reduction in
pump delivery reduces this trouble slightly, but is not of
much interest as for the trouble to occur at all the
radiator must be in a hopeless condition.

In order to avoid loss of water by expansion
(which is very rapid above 90°C.) and incipient boiling,
we have brought the red lamp in at 92 1/2°C. We could with
advantage have slightly more top tank capacity to deal with
this now that we carry more water owing to the larger spaces
between the tubes. The Chrysler evidently attach more
importance to top tank capacity as they have an extension
  
  


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