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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 Ltd. to Ariel Motors Ltd. providing recommended bearing clearances.

Identifier  ExFiles\Box 115\5\  scan0011
Date  21th March 1938 guessed
  
2

Messrs. Ariel Motors Ltd.

bearings halves stand proud of the joint face. This should be 0.001" on each side of the bearing relative to the joint face for each half of bearing.

WORKING CLEARANCE.

We recommend the following clearances for bearings -

(a) CONNECTING ROD BEARINGS.

For connecting rods we find the following clearances satisfactory :-

Minimum - 0.001 /inch diameter.
Maximum - 0.0018 /inch diameter.

(b) MAIN BEARINGS.

For main bearings where crankcase and crankshaft distortion must be taken into account we find thatthe following clearances are necessary :-

Minimum - 0.0012 /inch diameter.
Maximum - 0.00155 /inch diameter.
Preferred - 0.00135 /inch diameter.

We look forward therefore to having blue prints of the applications which you have in mind, when we should be very pleased to put up the proposition to you and make bearings for you to try out.

Assuring you of our co-operation and service at all times,

We are, dear Sirs,

Yours faithfully,
For WELLWORTHY PISTON RINGS LTD.,

Technical Manager.
  
  


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