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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).
Required testing for a Delco Remy Battery Ignition Head, focusing on friction, hysteresis, and drive slack.

Identifier  ExFiles\Box 163\7\  img282
Date  26th February 1936
  
86018
(Handwritten) WET- Presume you are answering this
(Initial) Am (Initial) Rm{William Robotham - Chief Engineer}

HS.{Lord Ernest Hives - Chair}

c.Wor.{Arthur Wormald - General Works Manager}By.Hs{Lord Ernest Hives - Chair}/Wst. BY/RD.

re Testing Delco Remy Battery Ignition Head.

The ignition governor mechanism on the
Delco Remy unit is constructed on entirely different
lines as we know to the governors designed by ourselves
and fundamentally should have much more inherent friction.
The effect of this friction would naturally be to introduce
a lag or hysteresis in the ignition advance curves plotted
against increasing and decreasing engine speed.

As to the significance or disadvantage of
this we have yet to learn, but firstly we should like to have
a bench test made determining how much it is, and this should
be done with the governors both in the lubricated and dry
or neglected conditions.

A further test we think ought to be made is
the measurement of the slack involved in the drive between
the L.T. cam and the driven wheel dealing with this drive
in the Wheelcase, that is, comparing the 25-30 with the
Delco Remy.

E.{Mr Elliott - Chief Engineer}
(signature)
  
  


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