Rolls-Royce Archives
         « Prev  Box Series  Next »        

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 issues and disadvantages found with Nivex and aneroid gauges.

Identifier  ExFiles\Box 19\3\  Scan382
Date  19th May 1930
  
Oy3/DW.19.5.30 -4-

He does not acknowledge the need for coupling up the pipes and testing gauge on chassis test, and then dismantling and repeating the performance at the coachworks, and believes this is the cause of some trouble on English chassis.

(13) Tank unit should be close (within 1½") to a baffle for maximum surge effects.

(14) The bell on the tank unit prevents large variations in reading when car cools off after a long run. While running the "air" in the pressure system will be 50% fuel vapor, and when this condenses the pressure-reading, which might fall to half the correct figure without the bell, will actually only drop about a gallon or less.
The lack of an air-bell was one of his suggested disadvantages of the Nivex gauge.

(15) The only other points which he mentioned on the Nivex were :-

Difficulty in reproducing accurate readings on a number of instruments without individual calibration.
No possibility of using balance-line, therefore no good for gauging oil level in crankcase.
Cost.
Lack of Sprengel replenishing valves.
Lack of a distinctive indication. Confusion with other instruments.

King Seeley, however, tried the aneroid gauge and found considerable variation with time, due to "seasoning" of the metal of the aneroids. Aneroids changed for several months after manufacture.

Oy.
  
  


Copyright Sustain 2025, All Rights Reserved.    whatever is rightly done, however humble, is noble
An unhandled error has occurred. Reload 🗙