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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).
Modifications to an induction pipe with a hot spot, focusing on the branch pipe and exhaust box connections.

Identifier  ExFiles\Box 50\3\  Scan058
Date  20th April 1921
  
X4305

To E. {Mr Elliott - Chief Engineer} from Hs. {Lord Ernest Hives - Chair}

Hs {Lord Ernest Hives - Chair} 2/LG20.4.21.

X4305

INDUCTION PIPE WITH HOT SPOT.

We have got on test one of these induction pipes. There are two points in connection with it which we think should be modified:-

1. The branch pipe is continuous the whole length. It is carried right through the casting for the hot spot. This means that we have a piece of steel pipe which prevents any liquid petrol getting direct on to the hot spot. We cannot see any reason why the branch pipe cannot be made of two short pieces of steel pipe, simply let into the casting which forms the hot spot.

We have taken it up with the D.O. here and they say that it is your instructions that the pipe should be carried right through. They something about torsion when tightening up the carburetter. I have told them that this applies to the pipe which passes over the engine.

The further experimental pipes which we are making have not the continuous branch pipe but we are making it in two separate pieces.

2. The connections which screw in the exhaust boxes are instructed in gunmetal. We think that these should certainly be made of steel. Firstly, so that we get the same rate of expansion to keep the joint tight and secondly, because if the gun metal gets hot it becomes very soft.


Hs. {Lord Ernest Hives - Chair}

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