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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).
Magneto testing, modifications for noise reduction, and the use of bakelite gears.

Identifier  WestWitteringFiles\S\March1928-May1928\  Scan022
Date  11th February 1928
  
-2- Contd.

its armature, but with the distributor removed. The
result is contained in my assistant's report WC.82 copy of
which is attached.

It will be noted that in this report there is reference
to the question of slow make and quick break. We were assured
by Mr. North that this continuous cam ring was arranged in
the manner suggested by us for reduced noisiness, but our
timing observations on the machine do not bear this out. It
does, however, appear to be a fact that there is considerable
inherent reduction of noisiness resulting from the use of the
continuous cam ring. We have all along urged the use of such
a cam ring with Messrs. North, and now at last they have sent
us a magneto so arranged. It certainly does appear that such
a modification is very desirable.

In regard to the use of all bakelite gears we are making
a suitable endurance test at 2000 R.P.M. in addition to the
running which these machines are getting on experimental cars.

The special EW6 magneto No.106012 is now being fitted on
an expl. car (9-EX) and it would appear that we should take
steps to obtain some more machines arranged in this way.
For instance, we could ask Mr. North to convert the four EW6
magnetos referred to in our RFC3/T11.2.28 which we had to
return for noisiness.

The force to operate the lever in this special machine
was satisfactorily low.

Contd.
  
  


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