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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).
On engine compression experiments, torque reactions, and carburettor improvements for the EAC.10 chassis.

Identifier  ExFiles\Box 19\7\  Scan124
Date  17th October 1928
  
E.{Mr Elliott - Chief Engineer}
Hs.{Lord Ernest Hives - Chair} from R.{Sir Henry Royce}
BY.{R.W. Bailey - Chief Engineer}

c. to BJ. Wor.{Arthur Wormald - General Works Manager}

x790

R1/M17.10.28.

EAC.10. (SS{S. Smith}) RE. COMPRESSION. X.790 X.7080 X.7005 X.7771

In our experiments we should use the highest compression that the engine will bear without detonations (say 5 to 1.)

(1) as a clean engine, and poor petrol.

(2) as a carboned engine, and good petrol.

We must then find out a way of preventing the torque re-actions reaching the body.

We are expecting some improvement from the EAC.10 chassis because of the 4 engine feet with hard rubber forward, and soft rubber under rear feet (which will require a support under gearbox).

It is not use working the other way.

I understand that we have made very little progress in B.HP. with the SS.{S. Smith} engine if we ~~continue~~ to use present Phantom carburetter, but I cannot believe these will not stand some enlargment of throats and ports.

I have also asked many times if we cannot get some improvement from two carbs. - i.e. two 3 cyls. as in F.{Mr Friese}, with carburetters in the vee.

We must get along with this engine and complete chassis; every day of delay is of importance.

R.{Sir Henry Royce}
  
  


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