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).
Testing a 36 m/m Claudel Hobson carburetter, comparing its performance to a standard R.R. model.
| Identifier | ExFiles\Box 121\3\ scan0018 | |
| Date | 23th February 1916 | |
| From Exp. Dept. Copies for: J.{Mr Johnson W.M.} R.{Sir Henry Royce} E.{Mr Elliott - Chief Engineer} Ha. Wor{Arthur Wormald - General Works Manager}/EH3/L23215. February 23rd. 1916. Re Claudel Hobson Carburetters. X.1452 We have tested the 36 m/m Claudel with a standard induction pipe and we find that we cannot get any increase in HP over the 32 m/m carburetter, the maximum difference we have obtained is .5 HP, there is no doubt that the throat area is larger because I have compared them. With a 32 m/m carburetter we can get fairly good acceleration but of course the engine will flop out if the throttle is opened quickly when the engine is turning slowly. I believe however that on the road with careful handling a car fitted with a Claudel would accelerate just as quickly as one with an R.R. carburetter. We can never expect to open a carburetter full suddenly and for it to pick up, with the R.R. the fact of banging open the throttle does not open the carburetter, the air valve does that automatically. With the Claudel it is possible by careful adjustment to get the engine turning over slower but the engine is liable to stop, so to be safe the carburetter must be adjusted to keep it running at practically the same speed as with the R.R. carburetter, for starting it is very little better than our own, it will not start up when the engine AS | ||