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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).
Letter from Ethyl Export Corporation discussing the effect of mixture temperature on fuel octane number.

Identifier  ExFiles\Box 27a\4\  Scan155
Date  13th July 1933
  
CABLEGRAMS:
ETHYLPORT, LONDON.

TELEGRAMS:
ETHYLPORT, CHURTON

81-87.

ETHYL EXPORT CORPORATION
Incorporated in the State of Delaware, U.S.A. with limited liability.

ABFORD HOUSE, VICTORIA
LONDON, S.W.I

Telephone:
VICTORIA
5520

Head Office:
135 EAST 42ND STREET
NEW YORK, U.S.A

13th July, 1933.

A.{Mr Adams} C. Lovesey, Esq.,
Experimental Department,
Rolls Royce Ltd.,
Nightingale Road,
DERBY.

Dear Lovesey,

With reference to our conversation yesterday and the question of the effect of mixture temperature on Octane number. I have a curve, which I give below, and which may be of some interest to you, although it will only concern the particular engine (C.F.R.) on which the tests were carried out.

The fuel is a "leaded" one and does not contain added aromatics, therefore the drop in value will not be so great as one which contains a reasonably high proportion of added aromatics.

The fuel (B2) is a sub-standard reference fuel which is used in place of pure Octane and Heptane for carrying out routine tests. It is a "straight run" petrol to which "lead" or benzene is added in order to obtain a given Octane value.

C.F.R. ENGINE
running at 900 r.p.m. with jacket temp. of 212°F.{Mr Friese}

Fuel
Mixture Tempt. °F
Octane No.

B2 + 2 ccs. of TEL per gal.
100
79.4

"
200
78.0

"
250
76.6

"
300
75.4

I had a talk with Wood to-day and I understood that you had already spoken to him. It appears that they wish to carry out immediate type tests on the 76/78 Octane fuel, but apparently he agrees to development on the 87 Octane fuel.

I will try and come up next week, but will give you notice before I arrive.

Kindest regards,

Yours sincerely,
Rod Banks.
  
  


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