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).
Pros and cons of different carburetter arrangements for a 6-cylinder car.
| Identifier | ExFiles\Box 13\3\ 03-page333 | |
| Date | 13th July 1931 | |
| HS.{Lord Ernest Hives - Chair} FROM R.{Sir Henry Royce} RL/13.7.31. C. to SG.{Arthur F. Sidgreaves - MD} WOR.{Arthur Wormald - General Works Manager} C. to BY.{R.W. Bailey - Chief Engineer} E.{Mr Elliott - Chief Engineer} CARBURETTERS. X.7080 X.5080 X7080 On the subject of car carburetters we appear to have several different opinions, so I am trying to clear it up as follows :- It is understood from Mr. Lovesey's conclusions that for our 6 cyl. car work we can choose between either the single expanding carburetter as has been the practice of RR., or if we wish to use a fixed throat carburetter we must use a separate carburetter for each of the three sets of cylinders, and in this case the induction pipe must be kept in the two sections. If the two separate carburetters are to be used the high speed air pasages must be short or the power falls off at high speed. If however this scheme is correctly arranged to the best advantage it will give greater power at both low and high speed than the single carburetter and also tends towards better distribution because the petrol is more accurately divided between the front and back halves of the engine. In the case of the double carburetter arrangement the difficulty seems to be in silencing the ingoing air, and in our arrangement we have combined the two carburetters into one suction which should render this problem much easier as the flow of air into this common supply pipe should be approximately constant. Our attempt at two separate non-expanding carburetters for Japan has already been sent to Derby. We have taken great pains to make this as pefect as our knowledge goes. They will need some careful experimental work to find the best proportions. R.{Sir Henry Royce} | ||