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Recently I upgraded to a MSD distributor w/ vac advance sdtup. The instructions that came in the box clearly stated to connect the vac adv line to a timed or "ported" source rather than a below the throttle plate constant vacuum source. Been driving GM cars mostly for 55 years. I remember always routing to constant vacuum port.
Yesterday I retimed my spark from 8 degrees to 12 degrees on the crank with 22 more in the centrifugal side for a total of 34 degrees, all in @ 2500. With the vac adv now on the ported side the idle is much more deep and agressive soundkng. After a full warmup lap around the neighborhood I reset all the idle controls to a slightly" fat " 900 rpm.
It seems to like this as well this way. It may reduce my highway mileage a bit because of reduced vacuum signal. With these double pumpers mileage is a sore subject.
Anyway, I am going to drive it like this for avtrial period then read plugs.
I have had no pinging at all but I am running a m20 muncie and I never lug my motors.
The motor seems to like the rapid advance curve. At a 3000 roll in first gear it will boil both big 10" tires just by mashing pedal GO pedal.
I know...people my age aren't supposed go do stuff like smokin rubber. To thaf I say : Bullfeathers
Yesterday I retimed my spark from 8 degrees to 12 degrees on the crank with 22 more in the centrifugal side for a total of 34 degrees, all in @ 2500. With the vac adv now on the ported side the idle is much more deep and agressive soundkng. After a full warmup lap around the neighborhood I reset all the idle controls to a slightly" fat " 900 rpm.
It seems to like this as well this way. It may reduce my highway mileage a bit because of reduced vacuum signal. With these double pumpers mileage is a sore subject.
Anyway, I am going to drive it like this for avtrial period then read plugs.
I have had no pinging at all but I am running a m20 muncie and I never lug my motors.
The motor seems to like the rapid advance curve. At a 3000 roll in first gear it will boil both big 10" tires just by mashing pedal GO pedal.
I know...people my age aren't supposed go do stuff like smokin rubber. To thaf I say : Bullfeathers