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 of results from Remy ignition tests performed at 12 volts.
| Identifier | ExFiles\Box 52\3\ Scan341 | |
| Date | 25th February 1916 | |
| 12 Volts Remy ignition tests X2814' | No | Conditions | Amps Short circuit | Amps 2000 revs | Amps 300 | Length of wire inside contact | Length of spark 30 rpm | Length of spark 2000 rpm | Sparking at contact holder with HT attd. 300 rpm | Sparking at contact holder with HT attd. 2000 rpm | |---|---|---|---|---|---|---|---|---|---| | 1 | Remy coil & contact breaker | 10.6 without resis, 4.9, 5.1 | 2.1, 1.2 | 3.1, 3.1 | 12" | 13/16, 11/32 | 3/8" 2820rpm, ~350 after points cut out, increased from 300revs to about 1300 then died out | slight | Very bad | | 2 | Remy coil & contact breaker | 5, 4.9 | 1.2 | 3.1 | 5 ft. | 11/32 | ditto | slight | bad | | 3 | Remy coil RR contact breaker | 4.9 | .5 | 1.5 | 12 inches | 3/8" | 2080 contact, Very slight, fainty no spark | 2,900, one rev spot at 300, slight | Very slight | | 4 | Remy coil RR contact breaker | 4.9 | .7 | 1.55 | 5 ft | 13/16" | 3/8" 1900 rev, 7/32" cutout | fair | slight | | 1 | RR coil RR contact breaker | over 15 amps, 5.2 with resistance | .9, 2.6 | 4 to 5 amps | 12 inches | 1/2" | 1/2" 1968 cutout | Very bad | Very bad | | 2 | RR coil RR contact breaker | over 15 amps | .8, 2.5 | 3.6 to 4 | 5 ft | 13/32" | 1/2" "2000" cutout | Very bad | Very bad | | 3 | RR coil Remy contact breaker | over 15 amps | 3, 4.5 | 9.5 | 12 inches | 3/8" | 5/16 cutout | Very bad | Very bad | | 4 | RR coil Remy contact breaker | over 15 amps | 1.5, 4.3 | 8 | 5 ft. | 3/8" | 1/4 cutout | Very bad | Very bad | | 1 | RR special coil RR contact breaker | 5.2 | .5 | 1.1 | 12 inches | 3/8 | 3/8 cutout | moderate | bad | | 2 | RR special coil RR contact breaker | 5.2 | .5 | 1.1 | 5 ft. | 3/8 | 3/8 | moderate | fair | | 3 | RR special coil Remy contact breaker | 5.2 | 1.8 | 3 | 12 inch | 5/16 | 15/32 | bad | bad | | 4 | RR special coil Remy contact breaker | 5.2 | 1.8 | 2.9 | 5 ft. | 3/8 | 15/32 | slight | bad | | | | 3.7 | 1.3 | 2 | | | | | | Side text: R.R. 160 (1) 1m 5 C 2F 1 25.2.16) B.P. 1340 Bottom note: 6.5 C.J.? | ||