08-05-2019, 09:46 PM
(This post was last modified: 08-05-2019, 09:52 PM by Bob Culver.)
A few pointers. Power must not be judged from engine or exhaust noise. An advanced engine sounds rorty when it may be little different, or lower powered! The manual advance range can be considerable, depending on the geometry of the linkages. On those cars the crank advance/retard is twice the rotation of the distributor body so can be estimated. For non sporty models considerably less than 20 deg BTDC crank full advance is usually adequate and prudent. Even for hand cranking it is unnecessary to retard before tdc. Neither of the auto advance distributors retard this far (the early Ruby ony 6 deg less than full advance). For the typical non sporty Seven doing most pulling in the 2000-3000 rpm range manual advance requirment is effectively constant, hence no need to fiddle with, or only very slightly. For the curious it can be interesting to calibrate the hand lever.
There were two original auto advance curves. The handbook instruction, much repeated, for the early Ruby repeats the manual instruction and is seriosuly wrong, esp so when applied to the later and similar replacement distributors.. It details the maximum difficult to determine advance instead of the static.
There were two original auto advance curves. The handbook instruction, much repeated, for the early Ruby repeats the manual instruction and is seriosuly wrong, esp so when applied to the later and similar replacement distributors.. It details the maximum difficult to determine advance instead of the static.