Cruise Seems Lean

Bewy said
Mattax,

Sorry your post #101 on vac adv is totally incorrect. Set any Chrysler 6 or V8 engine to the factory initial 6-12* timing. With the engine idling, turn the dist slowly to advance the timing. Idle rpm will increase [ more hp ] & vacuum will increase [ increased efficiency ]. To do this, one could use more init timing....or use vac adv connected to man vacuum to get the reqd amount of timing for best idle.
The exh dilution of the mixture at idle & low rpms [ even worse with increased cam duration, the rough idle ] requires more time to burn as efficiently as possible, & that includes Chrysler engines, & this is achieved by more timing at idle.

Question on this statement, and just a question. If initial timing with vacuum advance disconnected, is set at 18-20 (already well above factory settings) this additional timing is there. Then if connecting to ported vacuum, it is as set. If connected to manifold vacuum, it will be considerably higher but only until the throttle is opened - same as ported vacuum as it is equal to manifold vacuum once the throttle is open. So, with a more aggressive initial timing and the mechanical timing limited due to this, are we talking the same thing to some degree (pun intended)?@mattax your thoughts on this statement?