Rolls-Royce Archives
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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).
The wear measurements of a set of Bentley Aerolite pistons after mileage.

Identifier  ExFiles\Box 114\3\  scan0178
Date  6th October 1937
  
BY.{R.W. Bailey - Chief Engineer}
Rm.{William Robotham - Chief Engineer}

Rm{William Robotham - Chief Engineer}/GWH.{George W. Hancock - Head Chateauroux}45/G.6.10.37.

BENTLEY PISTON - AEROLITE.

You will no doubt remember our conversation
re the wear of grooves in pistons, and of thickness of
rings. The following are the measurements taken of one
of a set of pistons after a mileage of 26,227.-

Cylinder bore wear .0145" oval .0105"
Piston skirt clearance .004" top.
.003" bottom.

Top ring clearance .004"
2nd. " " .003"
Scraper ring clearance .003"
Top ring average wear .0015
2nd. ring " " .0005
Scraper ring " " .001

It is apparent from these measurements, there
is no need in service to worry about oversize rings in
regard to width.

Rm{William Robotham - Chief Engineer}/GWH.{George W. Hancock - Head Chateauroux}
  
  


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