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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).
Tests on rocker shaft pressure, anti-surge valve caps, universal joints, and petrol pump performance.

Identifier  ExFiles\Box 182\M18\  img041
Date  16th April 1934
  
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(4) We are running with the rocker shaft pressure raised to 10 lbs/sq.in. and a slot cut in the ball relief valve seating equivalent to the area of a 1/16" hole.

(5) The anti-surge valve caps which I brought back seem to be quite good on the standard springs. When we have had a little more experience to prove they function satisfactorily, we will send you out a set.

Universal Joint.

We are still experimenting with this. Leslie is suggesting that it is more rebound of the axle than twist. However, we are making some comprehensive tests on the subject so that we can parallel your results.

The tyres have been sent off.

mounting.

We note what you say about the silencer mounting.

The figures from the petrol pump tests are surprising, particularly the temperature under the bonnet. We can only conclude that the Harrison radiator is so efficient that it heats up the air more than the plain tube type. Naturally we should like you to find out where we have to put the pumps to obviate the trouble. Also whether it is peculiar to one type of petrol.

A point which interests me is what happens when you get petrol failure, is one completely helpless like we were with the mechanical petrol pump in Towster that day last Summer, or will these pumps clear themselves and enable one to continue running at a reduced speed ?

HS{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}
  
  


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