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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).
Comparative analysis of Bijur and Westinghouse starter motors for engine use.

Identifier  ExFiles\Box 23\2\  Scan047
Date  27th April 1920
  
Contd. -2- Cyl - M27.4.20.

ularly in the range of speeds between 1500 and 2500
R.P.M. which will be used in turning the engine.
Since, however, a torque of more than 4 ft.
lbs. is seldom required (this corresponding to 100 ft. lbs.
on the engine crankshaft) the disadvantage of Bijur as
compared with Bosch in current consumption is not thought
to be serious.
The Westinghouse, however, appears too extr-
avagant in current to be seriously considered by us.
From these electrical considerations, we
think that the Bijur is the motor we should use because,
while we have not found any actual trouble with our own
starter on imported cars during the winter,
we have observed that at 42 degrees F.{Mr Friese} the cranking revs.
of the engine are only about 65 R.P.M. and 80 R.P.M.
at 65 degrees F.{Mr Friese} While these speeds are sufficiently
if care is taken in priming the engine, they are not
as great as the speeds generally given by starters in
this country, which are in the neighbourhood of 100
to 250 R.P.M. - so that it would do us no harm to run
the engine at a higher speed.
BIJUR & WESTINGHOUSE STARTERS.
Working from the test charts which have come to us,
the following results may be expected from the Bijur and
Westinghouse Starter Motors respectively:-

BIJUR. Contd.
  
  


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