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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).
Central lubrication system pressures, pump capacity, and mileage intervals.

Identifier  ExFiles\Box 27\1\  Scan080
Date  19th February 1929
  
To DA.{Bernard Day - Chassis Design} from Hs{Lord Ernest Hives - Chair}/Gy.
c. to BY.{R.W. Bailey - Chief Engineer} Wor.{Arthur Wormald - General Works Manager}
c. to E.{Mr Elliott - Chief Engineer}

Y3806

Hs{Lord Ernest Hives - Chair}/Gy1/LG19.2.29.

CENTRAL LUBRICATION.

In reply to DA{Bernard Day - Chassis Design}2/M15.2.29. We think your information must be out-of-date. Springfield uses 100 lbs/sq.in pressure, and both Mr. Bijur and his Luvax representative recommend it. We do not think we ought to overlook this practice, without trying it. The reason given is that percentage discrepancies in pressure over the system do not cause such difference in the rate of flow of the drip plugs at 100 lbs/sq.in. as they do at 60 lbs/sq.in.

In so far as the pump has been relieved of certain thirsty components, certain others such as the shock dampers and front axle controls have been added, while it is now proposed to lubricate the springs also. Moreover, we wish to lubricate the chassis every 100 miles, instead of every 50 as is Springfield's practice.

The fact that N.schs.2647 and 2736 were designed to pump 15.07 ccs. and actually only gave 9 to 11 ccs. also demanded a larger capacity - the Bijur foot pump we dismantled was designed to pump 23.2 ccs., so we are still under its capacity if we make our own 20 ccs. We also wish to remind you that connected up to a rig representing the system, the best Bijur pump designed for 23.2 ccs., only yielded 16 ccs. We have not run this on a car however.

The descent of the plunger certainly does cause us anxiety. The contd :-
  
  


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