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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).
Table detailing the lowest speeds in RPM for regular firing of various magnetos.

Identifier  ExFiles\Box 4\5\  05-page240
Date  25th July 1922
  
VG30
3D.
25.7.22.

X.430. MAGNETOS.

TABLE OF LOWEST SPEEDS IN R.P.M. FOR
REGULAR FIRING ON 3RD TEL. GAPS IN AIR. CHAIN DRIVE.

N.B. Test range between advance and
retard 34° in all cases.

| Magneto. | Type & No. | X. No. | Lowest speeds. | Remarks. |
|---|---|---|---|---|
| | | | Adv. | Cent. | Retd. | |
| U.S.A. Bosch. | ZR.6. Ed.{J. L. Edwards}19 3385100. | 3916 | 56 | 105 | 150 | Advanced position same as makers. Retard position 2° earlier than makers |
| Watford. | EO6c. 50410. | 4181 | 210 | 200 | 200 | Advance and retard limited by movable sleeves attached to cam ring. Therefore range the same as makers. |
| Watford. | EL06. 55044. | 4275 | 67 | 68 | 69 | Advance and retard limited by movable sleeves attached to cam ring. Retard position same as makers. Advance position 28° later than makers. |
| Scintilla | AG-6-A 21523. | 4187 | 250 | 260 | 280 | } Refers to makers hand range only. 17.5°, 20° and 20.5° respectively. |
| Scintilla | AM-6-A 26485. | 4187 | 220 | 330 | 410 | |
| Scintilla | AM-6-A 34937. | 4187 | 150 | 200 | 280 | |
| Scintilla | AML-A 29531 | 4187 | 140 | 190 | 230 | As above |
| Scintilla 19.5.24. | AM6-A 2x533 | 4187 | 245 | 300 | 355 | } 19°, 20° & 19° respectively |
| Scintilla | AG6-A 34903 | 4187 | 160 | 220 | 290 | |
  
  


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