Sbc Vacuum Advance Or Not. We help explain ignition timing. i don't see why you can't use about 30 degrees total for initial plus mechanical advance (10+20), combined. the trick involves finding a vacuum can that offers the best (not necessarily the most) amount of advance at a low enough vacuum value to. the thing that throws me is that with manifold vacuum you have two devices working in the opposite direction, vacuum. the effect on the vacuum advance is consequently the same. limiting vacuum advance to roughly 12 to 16 degrees not only erases the negative attributes, its positive effects can include. unplugging your vacuum advance is costing you mileage and efficiency. Vacuum advance was the only way to achieve this, centrifugal weights and springs alone can’t do it. The important thing is to use vacuum advance, and adjust it correctly. Most v8 will happily cruise in high gear on level ground at 50° to 55° btdc ignition timing. specify just which advance you are using, point or hei, stock or after market adjustable, and he will send you. time it with a vacuum gauge, run it up to roughly 2500 rpm and turn your distributor until you reach your highest vacuum reading then lock it down.
from www.performanceonline.com
We help explain ignition timing. the effect on the vacuum advance is consequently the same. unplugging your vacuum advance is costing you mileage and efficiency. the thing that throws me is that with manifold vacuum you have two devices working in the opposite direction, vacuum. limiting vacuum advance to roughly 12 to 16 degrees not only erases the negative attributes, its positive effects can include. i don't see why you can't use about 30 degrees total for initial plus mechanical advance (10+20), combined. Most v8 will happily cruise in high gear on level ground at 50° to 55° btdc ignition timing. the trick involves finding a vacuum can that offers the best (not necessarily the most) amount of advance at a low enough vacuum value to. time it with a vacuum gauge, run it up to roughly 2500 rpm and turn your distributor until you reach your highest vacuum reading then lock it down. specify just which advance you are using, point or hei, stock or after market adjustable, and he will send you.
FiTech 99015 Go Spark Distributor, Chevy V8 w/Vacuum Advance, BBC/SBC
Sbc Vacuum Advance Or Not Vacuum advance was the only way to achieve this, centrifugal weights and springs alone can’t do it. Most v8 will happily cruise in high gear on level ground at 50° to 55° btdc ignition timing. the trick involves finding a vacuum can that offers the best (not necessarily the most) amount of advance at a low enough vacuum value to. the effect on the vacuum advance is consequently the same. i don't see why you can't use about 30 degrees total for initial plus mechanical advance (10+20), combined. limiting vacuum advance to roughly 12 to 16 degrees not only erases the negative attributes, its positive effects can include. We help explain ignition timing. Vacuum advance was the only way to achieve this, centrifugal weights and springs alone can’t do it. unplugging your vacuum advance is costing you mileage and efficiency. the thing that throws me is that with manifold vacuum you have two devices working in the opposite direction, vacuum. specify just which advance you are using, point or hei, stock or after market adjustable, and he will send you. The important thing is to use vacuum advance, and adjust it correctly. time it with a vacuum gauge, run it up to roughly 2500 rpm and turn your distributor until you reach your highest vacuum reading then lock it down.
