mechanical vs vac advance

GoodOleBoyzRacin · November 14th, 2008, 03:53 PM

im thinkin of taking the vac advance off of my MSD and locking it up with the parts they sent with the dizzy. could somebody please explain to me the advantages and disadvantages of mechanical advance?

SWEET2KSTANG · November 14th, 2008, 10:25 PM

the vacum advance will be a little nicer on cold starts and low rpm driving, but both will be the same at WOT. i have ran both, there is not much difference. with an ignition box, you wont have any issues running either. i tried this out on another car of mine a while back, i actually ended up keeping it mechanincal.

Kobra Killer · November 16th, 2008, 03:28 PM

I don't think locking out vacuum advance is the same as a mechanical advance.
Mechanical advance has weights & springs to adjust the advance at low revs.
Like Sweet2K says, at some rpm (around 3500) advance is all in & stays there.

November 14th, 2008, 03:53 PM	#1
GoodOleBoyzRacin Regular 1990 Mustang GT 13.64 @ 101 MPH Join Date: Jul 2008 Location: Memphis, TN Posts: 324 iTrader: 0 reviews	mechanical vs vac advance im thinkin of taking the vac advance off of my MSD and locking it up with the parts they sent with the dizzy. could somebody please explain to me the advantages and disadvantages of mechanical advance? __________________ 90 Ford Mustang 5.0 T5- BROKE 1.9 60' on street tires13.64 @ 101 MPH 89 Ford Mustang coupe- http://www.youtube.com/watch?v=1nIrzcQz3_8

November 14th, 2008, 10:25 PM	#2
SWEET2KSTANG mm's nitrous mod 2000 mustang gt 11.79@115.83 (old set up) Join Date: Oct 2006 Location: N.W. AR Posts: 12,430 iTrader: 8 reviews	the vacum advance will be a little nicer on cold starts and low rpm driving, but both will be the same at WOT. i have ran both, there is not much difference. with an ignition box, you wont have any issues running either. i tried this out on another car of mine a while back, i actually ended up keeping it mechanincal. __________________ project warhorse under construction being built by MP2 Performance

November 16th, 2008, 03:28 PM	#3
Kobra Killer Regular Join Date: Sep 2006 Posts: 123 iTrader: 0 reviews	I don't think locking out vacuum advance is the same as a mechanical advance. Mechanical advance has weights & springs to adjust the advance at low revs. Like Sweet2K says, at some rpm (around 3500) advance is all in & stays there. __________________ Clevelands Rule https://home.comcast.net/~jimmiephil...er_project.htm

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