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).
Carburetter fire risk, back-fires, and the effectiveness of the air intake design.
| Identifier | ExFiles\Box 66a\1\ scan0117 | |
| Date | 5th July 1926 guessed | |
| contd :- -2- With the aluminium air intake removed, we occasionally observe flames from the throats under severe conditions but with the air intake in position no flames were observed to come outside it. The probable explanation is that the tortuous passage through the R-R carburetter proves effective in damping out and cooling flame which blows back from a back-fire, also we demon-strated that the diaphragm at the top of the high speed throat contributes to no mean degree in preventing the passage of flame because the air valve falls when the induction pipe pressure increases. The float chamber of the standard carburetter is sealed and has equalising passages the same as introduced into the aero carburetters. From our tests it seems that there is no great risk of fire through either running backwards or popping back and that with the present air intake cover it is not necessary to employ a gauze over the intake. We have frequently experienced carburetter fires when running with Claudel carburetters. . We have noted the suggestions re. exhaust valve cool-ing and will arrange to test these methods. Hs{Lord Ernest Hives - Chair}/A.{Mr Adams} C. Lovesey. | ||