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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 The Riley Engine Co. regarding engine bearing and oil temperatures under various conditions.

Identifier  ExFiles\Box 131\1\  scan0088
Date  27th March 1933
  
X4693

CARS DRIVEN BY OUR STAFF AT OWNERS' RISK

The Riley Engine Co.

MOTOR MANUFACTURERS

Telephone: 4418 COVENTRY
Telegrams: "RILEY ENGINE," COVENTRY

CASTLE WORKS, ALDBOURNE ROAD
COVENTRY

Our Ref.
Date

The Grange,
Fillongley,
NEAR COVENTRY.

March 27th 1933.

Dear Mr.Lidsey,
I much regret that I should have overlooked replying to your letter before; being addressed home it got out of routine.

The larger bearing on the 6-Cylinder only accounts for about 10º cent over a Roller Bearing, full throttle track conditions (about 120 M.P.H.)

In racing practive we endeavour to keep the oil temperature to 90º cent and no trouble is experienced even with very heavy bearing loads using Glacier Motor Metal.

On production cars however, if the oil reaches anything above 70º cent there is trouble with hot footboards in the summer.

Trusting this is all you require,

Yours faithfully,

[Signature]

A.J.Lidsey Esq,
Messrs Rolls-Royce Limited.,
DERBY.
  
  


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