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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).
Engine component materials, hardness, and finishing techniques for wear reduction.

Identifier  ExFiles\Box 132\4\  scan0080
Date  17th August 1937
  
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Rm{William Robotham - Chief Engineer}/Mths.{Reg Matthews}5/AP.17.8.37

moment for reducing wear were Austenitic liners, nitrided liners, and Chromium plating of bores. He mentioned that besides Rovers, Standard were now laying down plant for chromium plating bores.

He could give no figures for an ordinary cast iron of 270 - 280 brinell compared with one of 200 - 220. Asked if he had any information as to whether nickel improved wearing properties, he stated that they could not find any improvement due to nickel from any of the results of other people.

Chromium he said generally improved wearing properties as did phosphorous which he said should amount to about 0.7%.

(5) Ring hardness to cylinder hardness.

They had no figures to show whether rings should be harder or softer than cylinder material, but believed they should be slightly harder. They are incorporating these tests in the tests on cylinder material.

They had not thought of trying various combinations of ring and cylinder material but thought when suggested to them that there might be something in it and would certainly try various combinations. They have various cylinder materials for test manufactured by various people but they will not be in a position to give any results for another six or twelve months.

(6) Machine limits on Cylinder bores.

They stated that cylinder bores should be held to .0005 because oil consumption varied considerably with piston clearance.

(7) Type of finish

Williams stated that in their opinion from tests carried out on this subject a 'honed' finish was the best; both from consistency of results and period taken to get rings 'run in' honed finish was better than ground finish. These tests are to be repeated however, but that was the conclusion arrived at on tests already carried out.

(8) Tin plating of Pistons.

No work had been done with tin plated pistons.

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