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).
Technical specifications and notes for a Marmon Car, including valve, spring, and chassis details.
| Identifier | ExFiles\Box 32\5\ Scan127 | |
| Date | 16th December 1920 guessed | |
| Contd. -3- Marmon Car Slack in Transmission. Top gear measured on road wheel 1 3/16". Lean of pivots N.S. 9/16" O.S. ½" measurement taken at 9½" length Particulars of Valve. Head 1.98" Stem .3735. Length overall 6.0. Thickness at head .150 (Convex head) Angle of seat 40º. Dia. of port 1.843. Two valve springs - Small Spring particulars. dia. of wire .150 Length 2.525" Outside dia. 1.250 No. of coil 8 Large spring particulars. dia of wire .175 Length 3.200" Outside dia. 1.900 No. of coil 7 Working compression 2¼". Large spring compressed. 52 lbs. 2¼" 64 " 1⅞" 80 " 1½" 90 " chock-a-block. COMBINED spring compressed. 82 lbs. 2¼" 113 " 1⅞" 130 " 1½" 170 " 1" 190 " chock-a-block. SMALL springs compressed. 30 lbs. 2¼" 50 " 1⅞" 70 " 1½" 90 " 1" 106 " chock-a-block Chassis frame is stamped out to form valences at each side not the usual U type. Front axle pivot bearing is of one piece and is not supported at the top as per sketch - | ||