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).
Performance comparison and critique of a 20 HP Wizard car against a standard 25 HP model.
| Identifier | Morton\M9\ img057 | |
| Date | 30th October 1931 guessed | |
| -2- of the numerous crankshaft periods which are all present as there is no crankshaft damper. The shaft is held in four bearings. The valve gear is not quiet, it is an overhead camshaft. The performance is dismal. One reason for this is that the car weighs 31.25 cwt. It is surprising that the engine, which was new, pinked badly up to 30 m.p.h. unless the ignition was retarded. It is difficult to credit that the M.G. engine is in any way related to that of the Isis. 20 HP. WIZARD. 2810 cc. We consider that this car, which follows American practice closely, is the best all round value for money of any English car we have tried. If it was fitted with a crankshaft damper and quiet timing gears it would be a remarkably fine power unit. Even as it is, geared to do 3650 R.P.M. at 60 m.p.h., it is not tiring to drive at a good average speed. The acceleration is almost similar to our standard 25 HP. with a 35 cwt. body. Top speed just over 60 m.p.h. Close coupled saloon, weight 27 cwt. The carburation was pleasantly responsive and free from flat spots. Half speed crank period about 3100 R.P.M. 4 bearing crankshaft. The brakes, steering, and suspension were all commendably efficient. The car we tried had done 4000 miles. Hs{Lord Ernest Hives - Chair}/Hn.{F. C. Honeyman - Retail orders} Photostat attached. | ||