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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).
Road tests on an oil compartment, noting issues with oil surge under braking and proposed modifications to the internal webs.

Identifier  ExFiles\Box 1\4\  B001_X 100a-page194
Date  3rd February 1933 guessed
  
rear end quickly, the oil quickly found its level in each compartment when the rear end was again let down.

To verify these tests we carried out the test on the road placing the bottom half in the rear of 19 EX with 1 1/2 gallons of oil at a temperature of approximately 80°. We placed it in a position as it would be if it were fitted to the engine; then we went on the road and observed what was taking placing actually whilst at speed etc..
Acceleration had the effect of slightly building up the oil in the rear compartment; retardation by throttle only, the oil retained its level; braking from 50 m.p.h. the oil was shot over the two weirs and practically emptied the rear compartment. The depth of oil going over the rear weir was quite .375 deep; this also applied to the front weir. Braking from 60 m.p.h. the oil shot over the weirs to such an extent that had we not prevented it from rushing out at the front end we should have lost half the oil. There was not more than one pint of oil left in the rear compartment.

This proves that it is not so much a question of having small holes in the dividing webs as making the webs taller. The two webs should be increased in height by .500 of an inch. The height of the weirs would then prevent the oil being shot over them to the extent that it is at present. We are doing this with sheet aluminium. The following will therefore be the particulars of the bottom half.

1. The two webs increased in height by .500.
2. The hole in the web adjuncent to the filter .6675 in diameter.
3. The hole in the front web .750 in diameter.
4. The release oil of which we explained yesterday, carried by a pipe and delivered into the rear compartment.

We shall have the bottom half again fitted up by morning and shall be able to give you the results.

G.W.H.
  
  


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