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 and specification review of several car models, including the Talbot 75 and 18/80 M.G. Mark II.
Identifier | ExFiles\Box 182\M19\ img259 | |
Date | 26th October 1931 | |
-2- powerful and progressive but since self servoing shoes were fitted to the front wheels, one would not expect them to remain well equalised. The steering was very fair, the clutch only worked moderately well. The distributors would guarantee a speed of 85 m.p.h. with the standard saloon body. - we should be very surprised if this car could attain 80 m.p.h. against the clock with the normal closed body. TALBOT 75. This has the same specification as the '90' except that the top gear ratio is slightly lower being 4.9 : 1, and the compression ratio is lower. The lower compression ratio did not appear to remove the roughness on the pick up whilst it detracted considerably from the performance. The timing gears were very noisy on this model and the clutch jaggered violently. We could not, however, pick out any vibrations on the over-run on this car. 18/80 M.G. MARK II. Engine displacement 2468 cc. Bore 69 mm./110 mm. Tax £18. Wheelbase 9'6" Track 4'4" Standard saloon price £670. Gear ratio given as 4.27 - 1. Over-head camshaft with inclined overhead valves. Silence. This car had an unduly noisy exhaust system which perhaps somewhat masked other features. However, the engine was quiet idling and there was very little carburetter noise and no excessive induction pipe roar. The half speed crankshaft period can be detected but was not very obtrusive. The worst noise was "pinking" and it was necessary to drive on the ignition lever at any speed lower than 30 m.p.h. when using standard fuel. This would doubtless be overcome if ethyl petrol were used. Vibrations. This power unit is very free from vibrations over its whole speed range. Below 25 m.p.h. there is not much torque but there is no roughness as on the Talbot. The half speed crankshaft period was just detectable. At speeds | ||