Rolls-Royce Archives
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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 memo detailing different configurations for an 8-cylinder engine.

Identifier  ExFiles\Box 6\6\  06-page206
Date  13th May 1937
  
600 8 cyl

Rm.{William Robotham - Chief Engineer}

typed
13.5.37

8 CYLINDER ENGINE.

The overall length of the block of the 8 cyl. Wraith is 33 1/2". The biggest bore it will take is 3.125, giving a capacity of 276 cu.ins. or 4.53 L (4.500 stroke). R.A.C. rating 31.25 HP. tax £24. Estimated weight 40 lbs. less than Bentley.

To give a capacity of 320 cu.ins. (5.24.L) the bore must be 3.375, increasing the length of the block to 35". R.A.C. rating 36.5 HP., tax £27, weight 7 lbs. less than Bentley.

Using a C.I. block without liners, 328 cu.ins. could be got into a block length of 31 1/2. This is with .200 thick barrels and .200 of water between the nearest bores. The weight would be 80 lbs. more than the Bentley using a C.I.head or 40 lbs. more with an alum. head.

Rm{William Robotham - Chief Engineer}/Smth.
  
  


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