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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).
Cause of spark plug sooting being new engine starting arrangements and the self-starter.

Identifier  ExFiles\Box 31\3\  Scan047
Date  6th November 1919
  
R.R Tsg. 100 T/SF. GTR. 10.4.19) C. 2561

COPY.

X.3082.
X.1812.
X.1449.

PN{Mr Northey}11/WL6.11.19.

CJ.

A good deal is being written about the sooting
up of plugs just now.

I have not seen it suggested that a contributory
cause may be our new arrangements for starting up the engine when
cold.

In previous years when starting up in cold weather
it was more or less the custom for the chauffeur to place
a penny under the low speed jet, now appears to be necessary
to run the engine for a few turns by means of the self starter,
with the two-way Priming Cock half open on the priming side,
in order that an excess of petrol may be sucked into the in-
duction pipe. Whilst this is doubtless quite effective for
starting, it may have the effect, especially with a low
grade fuel, or sooting up certain plugs ina way made possible
by the present self-starter.

P.N.

BN.{W.O. Bentley / Mr Barrington}

For consideration and if necessary experiment
please.

CJ.
  
  


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