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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).
The performance of a double breaker ignition distributor and ongoing associated coil tests.

Identifier  ExFiles\Box 163\7\  img231
Date  28th December 1933
  
-2- Hs{Lord Ernest Hives - Chair}/Wst.3/MA.28.12.33. Cont'd.{John DeLooze - Company Secretary}

(2) Our own double breaker ignition
distributor fitted with the new cam
to drawing DB.{Donald Bastow - Suspensions}358.


It will be noticed from these curves that the
make ratio which is a determining factor for high speed
operation remains practically constant up to a
distributor speed of 3,200 which is equivalent to an
engine speed of 6,400, and even at 10,000 R.P.M. engine
speed the make ratio has only fallen to the value we at
present set our standard 20/25 distributor, i.e. .55.
This improvement in performance is also brought about by
the fact that the contact breaker levers on the double
breaker distributor are appreciably lighter than the
Bensport.

We are carrying out further tests with the
ignition coil using various values of ballast resistance
and different windings to improve the coil performance
at high speed. These developments are extremely
important in view of the fact that the SpectreCodename for Phantom III we shall /on
require from each ignition distributor, and therefore
from each ignition coil, twice as many sparks per second
as that required by the Bensport at any speed.


Hs{Lord Ernest Hives - Chair}/Wst.
  
  


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