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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).
New throttle edge carburation scheme for the Phantom II.

Identifier  ExFiles\Box 13\4\  04-page191
Date  17th January 1934
  
Hs.{Lord Ernest Hives - Chair}
X7080
Hs{Lord Ernest Hives - Chair}/Swdl.{Len H. Swindell}3/KW17.1.34.

Throttle Edge Carburation (Phantom II).

We have tested out the scheme whereby the throttle edge plug is controlled by worm and wheel adjustment, to details BY/CS.1/EH.17.7.33.

This overcomes the Stromberg Patent of actuating the slow running plug used by us on the present production Phantom II carburetter, and thus its incorporation will save approximately 25/- per carb.

As detailed the screws which clamp the housing to the throttle body were in holes drilled right through into the bore of the body and caused a violent whistle, the mixture stream being deflected from the butterfly on to the edges of the holes. These holes should therefore only be drilled deep enough to hold the screws and not break into the bore.

The worm adjustment is better in that a finer setting can be obtained, there being 14 complete turns over its total range, which is 90° rotation of the feed hole.

A further advantage is that it is sealed against air leaks, the chassis test claiming a slight improvement in slow running, and this can only be due to the former reason.

The arrangement has been tried on the standard carburetter together with the large carburetter now being developed for the "Vulture", with satisfactory results, and can be used by production immediately.

Hs{Lord Ernest Hives - Chair}/L.H.Swindell.
  
  


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