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).
Proposal for the standardisation of the Phantom II exhaust heated induction pipe bend system.
| Identifier | ExFiles\Box 13\3\ 03-page205 | |
| Date | 13th December 1929 | |
| He/AJL.13.12.29. PHANTOM 11 EXHAUST HEATED INDUCTION PIPE BEND. The exhaust heated hot spot system which is fitted to 18-EX and which is proposed for immediate standardisation is as follows :- (a) Standard cylinder head. (b) Induction pipe bend E.80010 in cast iron. (c) Malleable iron pipe E.80194 connecting the bend to the cylinder head (Actually on 18-EX this was a built up job using bent tubing which is necessarily beaten out thin on the bend and is liable to burn through after prolonged use.) (d) Separate silencer for the exhaust from the hot spot to V.723/4/5 using six baffles only, equally spaced. The pipe connecting the hot spot to the silencer is clipped to the bottom flange of the o/s frame side member; the silencer is fitted level with the rear tie rod king post and a further length of pipe is carried from the silencer almost to the rear axle. No fish tail is fitted to the rear end of this pipe. This system gives an average temperature in the region of 220°C at normal touring speeds, at the hot spot bend outlet union, and increases to 350°C after prolonged high speed full throttle running so that the use of cast iron as material for the hot spot bend is necessary. He/AJL. | ||