Rolls-Royce Archives
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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).
Instructions and examination results for a new standard contact breaker design.

Identifier  ExFiles\Box 32\5\  Scan077
Date  27th July 1928
  
RR 238 (150 BKS.) (OB 461-8-12-24) MP 306975
X7690
ROLLS-ROYCE LTD.
INSTRUCTIONS.
To: E.7.C
Order No.: WD{Mr Wood/Mr Whitehead}3.
Customer's No.: X7690 X8690
New Standard R.R. contact breaker
to LEC 2460
We have now examined the characteristics of this new design by obtaining the make ratio - speed curve, the contact point gap being adjusted to give the standard make ratio of .55 at 700 rpm of the cam. We found this contact breaker functions very well the make ratio remaining almost constant over the whole range of working speeds.
This result is almost identical with Delco-Remy and better than U.S.A Bosch as will be seen from a comparison of the make ratio-speed curves.
Signed: H.E.W.
This Sheet must be filed on completion of the work.
  
  


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