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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 Zenith Carburetter Co. Ltd providing data on carburetter air flow and depression for two models.

Identifier  ExFiles\Box 122\3\  scan0100
Date  20th October 1938
  
1033
The ZENITH CARBURETTER·CO·LTD
HONEYPOT LANE
STANMORE
MIDDLESEX

CARS DRIVEN BY OUR STAFF ARE AT CUSTOMERS OWN RISK AND RESPONSIBILITY.
TELEGRAMS ZENICARBUR. PHONE. LONDON. CODE A.B.C. 5TH EDITION.
ADJOINING QUEENSBURY UNDERGROUND STATION
ALSO AT LYONS, PARIS, DETROIT, TURIN, BERLIN.
TELEPHONE WORDSWORTH 2213.

20th October 1938.

SWDL.{Len H. Swindell}
CTS{C. Trot Salt - Carburation} file.

Messrs. Rolls Royce Ltd.,
DERBY.

Attention: Mr. Robotham

Dear Sirs,

Our Mr. Fisher has asked us to send you data on the amount of air passed by the EEC-42 carburetter and by the experimental AA{D. Abbot-Anderson}-3 carburetter.

In the following table we show the depression across the carburetter in inches of mercury for the two carburetters, against the air flow through the two carburetters in lbs. per minute.

We have not given the whole of each curve, but only that above 18 lbs. of air per minute, as we think it is only that end of the curves in which you are interested.

The maximum amount of air which can be passed through our blowing plant at 3.5" mercury depression, is 27 lbs. per minute.

| Pounds AIR per minute. | DEPRESSION INCHES MERCURY |
|---|---|---|
| | EEC-42 | AA{D. Abbot-Anderson}-3 |
| 27 | 3.10 | 3.5 |
| 26 | 2.80 | 3.16 |
| 25 | 2.51 | 2.85 |
| 24 | 2.29 | 2.58 |
| 23 | 2.05 | 2.30 |
| 22 | 1.85 | 2.10 |
| 20 | 1.50 | 1.70 |
| 18 | 1.13 | 1.35 |
  
  


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