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).
Determination of the optimal induction pipe ramming length for high M.E.P.
| Identifier | WestWitteringFiles\P\July1926-September1926\ Scan067 | |
| Date | 19th August 1926 | |
| R.R. 235A (100 T) (S.H. 159. 11-8-20) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 2800 TO HS.{Lord Ernest Hives - Chair}) FROM R.{Sir Henry Royce} ch to BJ. WOR.{Arthur Wormald - General Works Manager} DY.{F R Danby} RECEIVED 20 AUG 1926 ORIGINAL R1/M19.8.26. X3874 X2481 B3824 X2480 HIGH M.E.P. - RAMMING ETC. Assuming a 2 1/2" bore induction pipe, and assuming 2,250 revs., what is the correct ramming length? Proceed by taking a group of 3 cylinders, or a single cylinder, supply the carburetter with slow speed air up to the entrance to the throat, then find the best length between this point and the cylinder to give the best M.E.P. or best compression pressure, possibly vary- ing the time of closing the inlet for each length of pipe. What the foregoing should tell us is the distance (mean average) or the overall length of the full speed induction path with four carburetters. R.{Sir Henry Royce} | ||