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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).
Experiments with induction pipe and nozzle designs to improve engine performance.

Identifier  ExFiles\Box 13\3\  03-page024
Date  21th April 1928 guessed
  
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distributing pipe to make room for the carburetter flange - see sketch - and this was found to have a beneficial effect on the distribution.

(2) The slot of the one piece pipe was longer and terminated in line with the centres of the centre ports.

A further improvement was effected by employing a nozzle like that shewn here.

The inside of the nozzle was tapered to .250" wide, the long edge projected .500 into the distributing pipe and the short edge projected .100.

As a result of these experiments we are making up a pipe for test on the two piece scheme to have a slot 12.5" long .4" wide with the spray nozzle as shewn above and also with the flattened portion in the distribution pipe like the one piece pipe.

We have appended some curves giving a comparison of the present std. induction system and the one piece overhead feed weir shewing the torque when the mixture strength is varied over a wide range. These were taken without any induction pipe heating at a constant speed of 1000 r.p.m.

From these curves we see that if the mixture is weakened, a lower specific consumption is obtained than with the std. pipe. The lowest specific consumption with the std. pipe is .57 pts/HP/hr. whereas we obtain .54 pts/HP/hr. with the weir type.

The underfed slotted type pipe was not so good as the weir type and the power output was lower over the whole range.

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