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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).
Specification sheet for the Wraith III chassis detailing updates to the engine and other components.

Identifier  ExFiles\Box 6\6\  06-page132
Date  15th February 1937
  
E.1/HP15.2.37.

SPECIFICATION OF WRAITH III CHASSIS.

ENGINE UNIT.
New engine unit incorporating rearranged auxiliaries, flat bottom tappets, Delco ignition, simplified fan and drive, lower half crankcase arranged for die casting, high front engine mounting, standard starter motor and drive, more flexible rear engine mounting, differentially coiled springs in Swedish wire, exhaust valves in S/SLV, inlet valves in S/65, crankcase castings in L.5 material, no shouldered studs for main bearings and cylinder and head, crankshaft with larger main bearings and present standard crankpins, 25/30 HP. drop forged connecting rods. 4 port cylinder head with carburetter on steering side, 80% still, larger oil pump with 22° helical teeth coarse pitch. Optional high pressure oil filter, A.C. with only main bearing oil passing through filter.

ENGINE CONTROLS.
To suit new engine unit as above.

EXHAUST FITTINGS. - To suit 4 port head.

RADIATOR. - Revised cheapened design of radiator.

BONNET. - As already instructed and fitted to first chassis. L.O.P. EW.755/6.

STARTING HANDLE. - As already instructed, L.O.P.EW.711.but may require small mods. to suit new engine.

UNDERSHEETS. - As already instructed and fitted to first chassis, may require mods to suit new engine, and vertical engine side guards for reducing under bonnet temperature and cost.

FLYWHEEL AND CLUTCH. - Flywheel with integral gear ring, N.Sch. 5040. Clutch as already instructed and fitted to first chassis - N.Sch.4882, with non-ventilated casing.

GEARBOX. - Exactly as instructed and fitted to the first car except for minor cheapening mods issued and to follow. N.Sch's 4838, 4840/1/2/3. 4882, 4871, 4873, 4885, 4922, 4926, 4932, 4945, 4994, 5002, 5007,5012, and 5035.
ALTERNATIVE - Fine tooth gears may be required in place of the Cadillac type gears which are incorporated in the above.

CHANGE GEAR AND BRAKE MECHANISM. - As already instructed.- Lec. 5212, N.Sch.4971.

REAR BRAKE EQUALISING GEAR. - As already instructed. N.Sch.4911.

REAR BRAKE INTERMEDIATE SHAFT. -do-

PROPELLER SHAFT AND UNIVERSAL JOINTS. - Hardy Spicer bought out. N.Sch.5024, 5027.
  
  


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