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).
Cylinder bore wear measurements for a 25 EX engine after mileage on Shell oil.

Identifier  ExFiles\Box 179\2\  img037
Date  26th November 1931
  
25 EX ENGINE
BORES OF CYLINDERS
AFTER 30000 MILES ON Shell Oil
[Struck-out text: 34,000 ON SHELL OIL]

TABLE DATA:
BORE N° | MEASURED AT | DIAMETER | WEAR
1 | CROWN | 4.2522 | .0022
1 | CENTRE | 4.253 | .003
1 | MOUTH | 4.251 | .001
2 | CROWN | 4.2525 | .0025
2 | CENTRE | 4.253 | .003
2 | MOUTH | 4.2512 | .0012
3 | CROWN | 4.2522 | .0022
3 | CENTRE | 4.2527 | .0027
3 | MOUTH | 4.251 | .001
4 | CROWN | 4.2528 | .0028
4 | CENTRE | 4.2532 | .0032
4 | MOUTH | 4.2512 | .0012
5 | CROWN | 4.2522 | .0022
5 | CENTRE | 4.253 | .003
5 | MOUTH | 4.251 | .001
6 | CROWN | 4.2526 | .0026
6 | CENTRE | 4.253 | .003
6 | MOUTH | 4.2512 | .0012

DRAWING SIZE 4.250" DIA
  
  


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