boilermaster
Well-known member
Hey Mustang owners,
I have a question about vacuum advance on our distributors,
Newer style that have the internal adjustment screw.
How are you folks limiting the maximum vacuum advance ?
I am trying to decide if I want to go with a re curved Duraspark unit, (module type un determined at this point)
But the last unit I had in a running engine would pull almost 20 degrees at the balancer when given max vacuum from a mityvac.
I realize that some of that number was from the rpm increase caused by applying vacuum and some of that has to be mechanical as well.
If I were to use a duraspark I would like to tailor some type of mechanical hard stop for the vacuum advance as well as being able to adjust the vacuum setting via the internal adjustment.
I know some of you have don't this, just need some idea"s
Was thinking of a properly plased screw thru the plate with possibly a little cam that one could turn to limit the max amount.
Guessing that I would want 4-6 degrees, I think I could figure where to place the screw to get that based on how far the arm moves
minus whatever mechanical advance would occur as a result of that increase.
anyone want to throw any idea's out there ?
I hate to say it BUT the gm boys can just look up a part number or get an aftermarket unit that limits maximum advance with a turn of a screw.
Boilermaster
I have a question about vacuum advance on our distributors,
Newer style that have the internal adjustment screw.
How are you folks limiting the maximum vacuum advance ?
I am trying to decide if I want to go with a re curved Duraspark unit, (module type un determined at this point)
But the last unit I had in a running engine would pull almost 20 degrees at the balancer when given max vacuum from a mityvac.
I realize that some of that number was from the rpm increase caused by applying vacuum and some of that has to be mechanical as well.
If I were to use a duraspark I would like to tailor some type of mechanical hard stop for the vacuum advance as well as being able to adjust the vacuum setting via the internal adjustment.
I know some of you have don't this, just need some idea"s
Was thinking of a properly plased screw thru the plate with possibly a little cam that one could turn to limit the max amount.
Guessing that I would want 4-6 degrees, I think I could figure where to place the screw to get that based on how far the arm moves
minus whatever mechanical advance would occur as a result of that increase.
anyone want to throw any idea's out there ?
I hate to say it BUT the gm boys can just look up a part number or get an aftermarket unit that limits maximum advance with a turn of a screw.
Boilermaster