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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).
Modification to prevent clutch slipping on high compression 20/25 HP cars.

Identifier  ExFiles\Box 5\6\  06-page067
Date  30th April 1930
  
BY.{R.W. Bailey - Chief Engineer} From Hs{Lord Ernest Hives - Chair}/AJL.
c. to EP.{G. Eric Platford - Chief Quality Engineer}
c. to MX.{John H Maddocks - Chief Proving Officer}

15300

Hs{Lord Ernest Hives - Chair}/AJL.1/W.30.4.30.

CLUTCH SPRINGS FOR HIGH COMPRESSION 20/25 HP. CARS.

It is evident, from our own experimental experience, that the high compression 20/25 HP. cars will be troubled with clutch slipping if no attempt is made to strengthen up the clutch springs.

There were a number of chassis produced before the final clutch spring modification (20% increase) came on to production, and these must be altered. It is a costly job to modify these existing clutches to the latest scheme.

We should recommend for these that the existing clutch springs be strengthened up by using a packing washers .105" thick behind each spring. This has the effect of putting up the normal load on each clutch spring from 105 to 117 lbs - i.e. an increase of 11.5%.

This increase does not produce an objectionably high clutch pedal pressure and is sufficient to give freedom from clutch slip.

Hs{Lord Ernest Hives - Chair}/AJL.
  
  


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