Vacume Advance\Timing

[2High4U]

which port on the carb do i hitch the vacume advance to i have a edelbog 1406 i think the one on the right or the one on the left?

 

[78Suburban]

I wanna say right, but get a second oppinion before you go with that.

 

[2High4U]

ok i tried that and i couldnt even find the timing mark but umm i dont know it run ok but seems to have lack of power i advanced it a couple of degreees its seems to help a little... when i give it gas where its hooked up now the timing mark advances itself to the left isnt it supposed to go to the right?

 

[78Suburban]

the mech advance should be unhooked and your carb line should be plugged. Advancing means moving the timing farther before TDC, which means the little line on the balancer will me moving left on the timing tab. I just timmed my motor, and set it at 8* BTDC, you motor may require a different setting.

 

[mrk5]

the vacuum advance should be unhooked and your carb line should be plugged. Advancing means moving the timing farther before TDC, which means the little line on the balancer will me moving left on the timing tab. I just timmed my motor, and set it at 8* BTDC, you motor may require a different setting.

Fixed it for you.


Actually your question can me more complicated than you think. Technically it could work on either port. Not sure which vehicle in your sig you're working on. I'm guessing the TA probably had it hooked to what I call ported vacuum. The blazer was probably on manifold vacuum. You can figure out which one by starting the truck and putting your finger over the ports. The one that sucks is manifold, and the other is ported.

Being a Trans Am guy, you should check out Thirdgen.org . Tons of info on those cars, and specifically motor tuning. If you do a search for vacuum advance you'll find a whole lot of info on the ported vs. manifold debate.

 

[mrhoes]

I run a 1406, for a while I ran the vacume advance on the wrong port and it would make the engine ping. I thought that it was the timing but it was pulling too much vacume, When you are facing the carb the small port on the left, that is the right one.

 

[2High4U]

thanks for the help guys.