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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).
Design improvements for petrol tanks, with sketches.

Identifier  ExFiles\Box 68\1\  scan0269
Date  8th February 1926
  
To Hs.{Lord Ernest Hives - Chair}
BY.{R.W. Bailey - Chief Engineer}
DA.{Bernard Day - Chassis Design}
FROM R.{Sir Henry Royce}
LE CANADELHenry Royce's French residence.

c. to CJ. BJ.

X8460

PETROL TANKS ETC. X. 8460
X. 8992.

The tank on 7-EX (R's car at Le CanadelHenry Royce's French residence) is a great improvement, and with the exception that the gauge goes round anti-clockwise, there seems little to alter. The points are :-

(1) Everyone uses pumps (avoiding cans for some reason). With some of the pumps the speed of petrol entry is uncontrollable because it is gravity fed from the measuring tank, with no cock. It is very fast because petrol is so limpid - (we were quite right in avoiding an ingoing filter.

(2) In our present standard the air escape is unsatisfactory. It should either by higher up, or a tube should be fitted, to prevent the outgoing air being trapped by ingoing petrol - (see sketch). I was ashamed of one I saw. Please get it altered at the earliest possible moment: 10,000 miles should not be necessary.

[Sketch of a petrol tank filler neck]
Suggested inner tube.
Or pipe brought up there.
Vent pipe.

Probably the nozzle I saw used on one of our standard cars was too short: afterwards a smaller one was screwed on, which reached further, and reduced the quantity. It was better, but not satisfactory.

If any difficulty found from petrol surging across tank, and out of ventilated cover (in any type) I suggest diaphragms carried on cover thus, with capacity above.

[Sketch of a diaphragm in a filler neck]

R.{Sir Henry Royce}
  
  


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