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).
Valve lift data and cam specifications for a Packard car.
| Identifier | ExFiles\Box 127\1\ scan0075 | |
| Date | 23th February 1920 | |
| PACKARD CAR. Degree on Flywheel valve lift 10 .075" 20 .078" 30 .095" 40 .1225" 50 .160" 60 .203" 70 .2625" 80 .316" 90 .350" 100 .369" 110 .387" 120 .383" 130 .383" 140 .3805" 150 .364" 160 .333" 170 .287" 180 .237" 190 .184" 200 .144" 210 .115" 220 .091" 230 .079" 240 .076" 250 .075" 260 Degree on flywheel lift. 0 .070" 10 .0705" 20 .0705" 30 .074" 40 .085" 50 .106" 60 .1385" 70 .179" 80 .229" 90 .2785" 100 .322" 110 .354" 120 .370" 130 .375" 140 .366" 150 .341" 160 .3015" 170 .244" 180 .192" 190 .1485" 200 .114" 210 .0905" 220 .076" 230 .071" 240 .071" 250 .0705" Exhaust Valve Cam. .003" tappet clearance. Period of exhaust 230° lift of valve .312" Inlet valve Cam .002" tappet clearance. Period of induction 230° lift of valve .305" -- -- -- -- -- -- -- -- [Handwritten] Road Test without slipper wheel crank period. Top drive 34 m.p.h. 30-35 Max. speed 2nd gear. 40 m.p.h. 20 lbs period 22 m.p.h. | ||