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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 report on a vehicle's suspension, engine lubrication, brakes, and general handling characteristics.

Identifier  ExFiles\Box 23\3\  Scan022
Date  18th August 1926 guessed
  
contd :-

-3-

SUSPENSION.

In spite of the large amount of damping on the front, there was no feeling of exceptional harshness in the driving seat. The rear suspension had not enough damping, having been set for Paris conditions. On a bad road the back of the car was all over the place and steering selectiveness consequently poor.

ENGINE LUBRICATION.

The makers provide a special pin to be inserted for town use to reduce the oil delivery. This has to be removed for touring.

BRAKES.

These were the best direct acting brakes we have tried on a car of this size.

GENERAL PERFORMANCE.

This is an excellent example of a high efficiency sleeve valve engine. Monsieur Weymann states that it develops 175 HP. and that the car is very much faster than Renault or Hispano, both of which he owns. The gearbox was rather noisy, the rear axle just audible, the exhaust noisy, but the engine itself seemed very free from mechanical sound. The suction note from the two carburetters at low speeds was very pronounced. The carburation of this car is bad up to 30 m.p.h. It will run slowly on top gear, but any sudden depression of the accelerator pedal shews up an absolute flat spot. It is possibly owing to this fact that the engine is remarkably free from detonations when being driven in traffic, also shews no torque reaction vibrations. On the whole it is more tractable in traffic than the Hispano.

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