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).
Engine performance test results, including speeds achieved with different exhaust and silencer configurations.
| Identifier | ExFiles\Box 13\4\ 04-page012 | |
| Date | 23th July 1932 | |
| -3- of increased power output. It will be noted that under these conditions which is the state in which all except Continental type cars are now run, the difference between the standard and semi-expanding carburetter is reduced to 1 H.P. and for this reason we want the semi-expanding carburetter to start its existence with a freer exhaust. The net results of the new camshaft, higher compression and new carburetter i.e. all the improvements now running on France are shown on Sheet 11 by the figures of 25-EX. and 19-EX., standard cars, which indicates a gain of at least 5 H.P. under all conditions, which is an appreciable step forward. We have now received the results of the tests carried out on 19-EX. in France by G.W.Hancock to confirm our Brooklands results. The best speeds were obtained with a late timing I.O. 5.5 degs A.T.D.C., and were as follows, each result being the average of a number of both-way runs over the half mile. C.O. closed 82.75 M.P.H. (25 HP. Resonance Silencer fitted). C.O.Open 86 M.P.H. Silencer removed for sliding joint 86.96 M.P.H. This is therefore the absolute maximum that can be expected until the larger air valve M.R. semi expanding is available. G.W.Hancock is going to confirm these results on Montlhery track before the completion of the 10,000 miles test. SUMMARY. Sales have recently quite justifiably quoted the Lincoln figures of 95 and 97 M.P.H. over the half mile given in the Motor and Autocar tests, against the Continental P.II. The best C.O. open half mile covered in these recent tests was 93.7 M.P.H. We know from the figures on G.M. Proving Ground that the 16 cyl. Cadillac (17% greater displacement than the Lincoln) will better the Lincoln figures appreciably. | ||