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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).
Piston ring gap measurements for Unit No Phantom III 13, showing wear after testing.

Identifier  ExFiles\Box 91\2\  scan0407
Date  10th September 1937
  
9
UNIT No P.III 13
PASSED TO TEST :- 7-5-37
COMPLETED TEST :- 10-9-37

PISTON RING GAPS 'B' SIDE

WORKING GAP
FREE GAP

COMPRESSION RING
1ST & 2ND E.B. 1494 1/C (Brico)

SCRAPER RING
E.B. 2686 1/C (Brico)

RUNNING TIME :- -
MILEAGE :- 17.110

TABLE OF PISTON RING GAPS
------------------------------------------------------------------------------------------------
| PISTON | RING | FREE GAP | WORKING GAP |
| No | No |------------------------------------------|-------------------------------------------|
| | | BEFORE | AFTER | WEAR | BEFORE | AFTER | INCREASE WEAR |
|--------|------|--------|-------|--------|--------|-------|---------------|
| 1 | 1 | | | | .006 | .010 | .004 |
| | 2 | | | | " | .008 | .002 |
| | 3 | | | | " | .010 | .004 |
|--------|------|--------|-------|--------|--------|-------|---------------|
| 2 | 1 | | | | " | .008 | .002 |
| | 2 | | | | " | .008 | .002 |
| | 3 | | | | " | .010 | .004 |
|--------|------|--------|-------|--------|--------|-------|---------------|
| 3 | 1 | | | | " | .010 | .004 |
| | 2 | | | | " | .010 | .004 |
| | 3 | | | | " | .010 | .004 |
|--------|------|--------|-------|--------|--------|-------|---------------|
| 4 | 1 | | | | " | .010 | .004 |
| | 2 | | | | " | .010 | .004 |
| | 3 | | | | " | .010 | .004 |
|--------|------|--------|-------|--------|--------|-------|---------------|
| 5 | 1 | | | | " | .008 | .002 |
| | 2 | | | | " | .010 | .004 |
| | 3 | | | | " | .010 | .004 |
|--------|------|--------|-------|--------|--------|-------|---------------|
| 6 | 1 | | | | " | .010 | .004 |
| | 2 | | | | " | .009 | .003 |
| | 3 | | | | " | .010 | .004 |
------------------------------------------------------------------------------------------------
Note: The 'Free Gap' columns are blank. The '"' symbol indicates the same value as the cell above (.006).

ExI 221
Sheet 2
  
  


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