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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 to diagnose and resolve fume ingress into the cabin of Chassis No. 2323.

Identifier  ExFiles\Box 136\5\  scan0036
Date  19th March 1924
  
X819

To R.{Sir Henry Royce} from Hm.{Capt. W. Hallam - Head Repairs}
" J.{Mr Johnson W.M.}
" J.{Mr Johnson W.M.}
" or.
" P.
" Hs.{Lord Ernest Hives - Chair}
" BY.{R.W. Bailey - Chief Engineer}
" Rg.{Mr Rowledge}

Re Fumes in Car.
Chassis No. 2323 - S. Steavenson Esq.

The above owner has complained for a long time about fumes, and whilst he has been very patient in letting us have the car for experiments for long stretches at a time, his attitude all through has been that the car smelled so badly that it was impossible for him to continue to use it.

During our experiments we have come to the conclusion that the fumes complained of are those which leave the end of the Silencer, and are not from the Crankcase as we have previously thought, and the best results obtained have been by preventing the exhaust fumes from entering the body, by isolating the body and particularly the floor boards as much as possible.

Another scheme which helped was by altering the Undershield and Side Engine Guards as has been done on an Experimental car by Hs.{Lord Ernest Hives - Chair}, though this did not prevent the smells.

A really good fitting Throttle also helped.

We think the isolation of floor boards etc., especially towards the rear end of the car, is a most important feature, and our experiments led us to pump smoke from another car under the back of the troublesome car, and have the engine of the latter running at the same time.

It was noted where the smoke came through the crevices, and the boards were then fitted with felt, or remade until practically no smoke penetrated the boards.

It was interesting to note the difference with and without the engine running whilst the smoke was being emitted.

It appears from these experiments that the Fan and Flywheel looked after and prevented the smoke from passing the pedal slots in the foot boards, and that the necessity for isolation at this point is not of great importance.

In our earlier experiments we tried ventilating
  
  


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