FINALLY - Vacuum Advance Dilemma Solved

[Silverback51]

Originally Posted by jwd

That article was written by John Hinckley and you can take it as the gospel. I've built and tuned many engines from a complete stocker to 800+HP monsters and every single one of them had vacuum advance hooked up to manifold vacuum. I would run from any engine builder that said "vacuum advance is a waste of time" or "this motor doesn't need it, it's a race motor" because they obviously have no f---ing idea what they're talking about and read too many Hot Rod magazines.
This topic has been beaten to death and the result is always the same - those who know, run vacuum advance. Those who don't, should.
I posted that same article a while back trying to convince some naysayers. I guess you just can't cure stupidity.

Gee Jim, are you saying I'm stupid?

Actually since I went back to the vacuum secondary carbs, I'm going to go back to the vacuum advance distributor to see how it works.

[jwd]

Originally Posted by Silverback51

Gee Jim, are you saying I'm stupid?

Actually since I went back to the vacuum secondary carbs, I'm going to go back to the vacuum advance distributor to see how it works.

I'd never call you stupid John. Maybe misinformed though. Smart move on the carb. change but don't get me started on mech. secondaries on the street. Let me know if you have any problems with the dist. changeover.

Jim

[elmariachi]

Originally Posted by Silverback51

Gee Jim, are you saying I'm stupid?

Actually since I went back to the vacuum secondary carbs, I'm going to go back to the vacuum advance distributor to see how it works.

John, which distributor are you going to use?

Jim

[CHANMADD]

Nothing beats my 800 double pump (mech) spreadbore!!!!!

[jwd]

Originally Posted by CHANMADD

Nothing beats my 800 double pump (mech) spreadbore!!!!!

Glad it works for you. Ever wonder why, even in the horsepower wars of the 60's and early 70's, that ALL manufacturers used vacuum secondary carbs.? That includes the GM L-88 (550HP), LS-6 (450HP) and your Ford, 428 SCJ, 429 SCJ and the dual quad 427 SO. Maybe you're smarter than those factory engineers that spent hundreds of thousands of hours designing those motors.
A street driven car with a DP isn't living up to it's potential.

[DanEC]

Originally Posted by jwd

A street driven car with a DP isn't living up to it's potential.

Jumping from vacuum advance to mechanical secondaries and now to double pumper carbs. I'm not tracking. I've never heard anyone critisize a double pumper carb. It may be overkill for some motors but having a good shot of fuel on acceleration is never a bad thing.

[jwd]

Originally Posted by DanEC

I've never heard anyone critisize a double pumper carb. It may be overkill for some motors but having a good shot of fuel on acceleration is never a bad thing.

I've converted many people to vacuum secondaries and every one was more than happy with the results. That "good shot of fuel" is used to cover up the short comings of forcing more air into the motor than it needs. Just another case of "if racers use it, it must be good".

[Silverback51]

Originally Posted by elmariachi

John, which distributor are you going to use?

Jim

Both distributors are MSD units for the 460. One with and one without vacuum advance.

If the weather ever turns nice in this festering crap hole, maybe I will get a chance to try it out.

[jwd]

Originally Posted by Silverback51

Both distributors are MSD units for the 460. One with and one without vacuum advance.

If the weather ever turns nice in this festering crap hole, maybe I will get a chance to try it out.

MSD uses AC/Delco vacuum advance units. You need to know what your engine vacuum is at an idle in order to choose the correct unit.

[Silverback51]

Originally Posted by jwd

MSD uses AC/Delco vacuum advance units. You need to know what your engine vacuum is at an idle in order to choose the correct unit.

I know it sucks.

Otherwise it would be a diesel.

[jwd]

Originally Posted by Silverback51

I know it sucks.

Just gotta know how hard it sux.