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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).
Examination of a distributor's contact points and head after a bench test.

Identifier  WestWitteringFiles\U\August1930-November1930\  Scan138
Date  20th October 1930 guessed
  
-4-

piercing the rubber insulation. A moulded cap also
provided with corresponding grooves is then screwed down
over the wires. This arrangement allows all the wires to
come out from one side of the distributor, makes it water-
proof, dispenses with terminals and gives the distributor
a clean and neat appearance.

The whole distributor was fixed up on our bench
rig and connected up to an R.R. coil and ballast and run an
equivalent of 10,000 miles on the chassis, at 700 r.p.m.
An examination of the contact points and the
distributor head at the conclusion of this run shewed that
considerable burning had occurred on the H.T. brass inserts
and rotor finger; we consider brass to be most unsuitable
for this purpose. The tungsten contact breaker points did
not appear to have performed very well, bedding only
having been established over 75% of the surfaces and a
considerable pip (relatively) on the lever point with a
corresponding cavity on the fixed point was observed.
The condition of these points was not as good as
we obtain on our standard distributor with the exception
that on the Delco-Remy oxidation was entirely absent, nor
are they as good as the previous Delco-Remy set tested
in 1925. Apparently there is not the amount of flexibility
which is required to maintain good condition of the points
  
  


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