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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 Wellworthy Piston Rings responding to concerns about a slotted oil control ring not bedding-in correctly.

Identifier  ExFiles\Box 148\3\  scan0398
Date  27th September 1938
  
SERVICE DEPOTS
LONDON
89 BLACKFRIARS RD S.E.1
TELEPHONE: WATERLOO 5762-3
172 GT. PORTLAND ST.{Capt. P. R. Strong} W.1
TELEPHONE: MUSEUM 2433
119 LEYTONSTONE RD
STRATFORD, E.15
TELEPHONE: MARYLAND 2439
BIRMINGHAM
143 SUFFOLK STREET
TELEPHONE: MIDLAND 0638
MANCHESTER
232 DEANSGATE
TELEPHONE: BLACKFRIARS 5928
NEWCASTLE
MILLICAN'S BUILDINGS, MARKET ST
TELEPHONE: 23874

ON ADMIRALTY, WAR OFFICE, AIR MINISTRY, INDIA OFFICE LISTS

WELLWORTHY
PISTON RINGS
LIMITED
PISTON & PISTON RING SPECIALISTS
LYMINGTON
HANTS
WORKS & HEAD OFFICE: STANFORD RD

DIRECTORS:
G.{Mr Griffiths - Chief Accountant / Mr Gnapp} H.{Arthur M. Hanbury - Head Complaints} ALEXANDER
J.{Mr Johnson W.M.} W. HOWLETT
C. B. KAY
P. WALDEN

OUR REF FB/EHF.09419

SERVICE DEPOTS
LIVERPOOL
45 RENSHAW ST.{Capt. P. R. Strong}
TELEPHONE: ROYAL 5786
LEEDS
82 WOODHOUSE LANE
TELEPHONE: 25774
CROYDON
246 HIGH STREET
TELEPHONE: 6121-2
SOUTHAMPTON
2 PORTSWOOD ROAD
TELEPHONE: 74776
HULL
285 ANLABY ROAD
TELEPHONE: 15312
CANTERBURY
21 & 22 ROSE LANE
TELEPHONE: CANTERBURY 2456

TELEPHONE: LYMINGTON 520 (5 LINES)
TELEGRAMS: WELLWORTHY
CODE: MARCONI

YOUR REF Rm{William Robotham - Chief Engineer}/CTS.{C. Trot Salt - Carburation}5/JH.

Handwritten: 1256.
Handwritten: Oil Consumption file.
Handwritten Signature

27th September, 1938.

Messrs. Rolls Royce Ltd.,
Derby.

Dear Sirs,
Attention of Mr. Salt.

We thank you very much for your letter of the 23rd inst., and for the slotted oil control ring which is the subject of your letter.

We regret to note that this ring has not bedded-in as might have been expected, considering it must have run some few hours in an engine. This matter is being taken up with our Works and Inspection Department to obviate a recurrence of your receiving such rings.

Taking the various points you have raised in the order in which you have placed them -

(1) We would say that practically no ring can be put out of shape by bending manually, and in assembling over the piston no appreciable distortion takes place which would in any way affect the running of the ring.

(2) Distortion by rough handling would not account for the uneven bedding which was noticed on the ring you returned, this being purely a machine-shop problem.

(3) We agree that reducing one land diameter would give increased unit pressure on the remaining land, but do you actually want high loading in the early stages of running-in which can cause scuffing of the ring and the cylinder bore.
  
  


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