Vacuum ports and Throttle setup
Logistics Pro
Joined: Nov 2009
Posts: 3,885
Likes: 12
From: Lawrence Swamp
Ported vacuum is used on stock configurations with no vacuum going to the dizzy until the throttle is opened or there is X amount of flow going through the carb depending on the source of ported vacuum. Manifold vacuum is available full time as long as the engine is running. When doing any modifications at all with dizzy or carb upgrades one will have to try both sources to see which works the best especially at idle speed.
Thanks again.
cf
Logistics Pro
Joined: Nov 2009
Posts: 3,885
Likes: 12
From: Lawrence Swamp
The one to the PCV/breather will be a full vacuum source. The other may be ported/timed for the dizzy.
No PCV in '68, just a straight hose across there. Anyway, so the ported can be removed when going DSII as you have? Recurve a new dizzy, block up the line we're talkin bout, also new coil, plug wires and something like the mallory6A? No need to change the carb until affordable? I gotta go 'step by step'.
cf
No PCV in '68, just a straight hose across there. Anyway, so the ported can be removed when going DSII as you have? Recurve a new dizzy, block up the line we're talkin bout, also new coil, plug wires and something like the mallory6A? No need to change the carb until affordable? I gotta go 'step by step'.
cf
Postmaster
Joined: Dec 2006
Posts: 3,603
Likes: 10
From: Spokane, WA
My dizzy runs off a full vac source directly from the manifold. It will work either way but when hooked up to a timed port the throttle blades on the carb have to be adjusted usually more open to get the idle under control.
Check out the Summit Street & Strip box if you are going aftermarket. It's usually a better buy and does the same thing as a Mallory or MSD.
Check out the Summit Street & Strip box if you are going aftermarket. It's usually a better buy and does the same thing as a Mallory or MSD.
Postmaster
Joined: Dec 2006
Posts: 3,603
Likes: 10
From: Spokane, WA
Even less yet...you might consider using the GM HEI module if you don't want to use the DS2 or an aftermarket box.
Loser Index Check it out in the Ignition Section there.
Loser Index Check it out in the Ignition Section there.
Logistics Pro
Joined: Nov 2009
Posts: 3,885
Likes: 12
From: Lawrence Swamp
Even less yet...you might consider using the GM HEI module if you don't want to use the DS2 or an aftermarket box.
Loser Index Check it out in the Ignition Section there.
Loser Index Check it out in the Ignition Section there.
The DSII might not fit my 170. I put in PS & it's kinda close in there.
Logistics Pro
Joined: Nov 2009
Posts: 3,885
Likes: 12
From: Lawrence Swamp
Harte3,
go fast for less is helpful (my 2nd look) for me due to indepth coverage of theory. I may buy the brother's falcon performance book. The 2 'advances' & some of the 'ignition' were educating also (i sorely need that n more). The carb stuff not so much so. He seems to be a racer n I want low rev power (off rd working in the swamp & on hills, haulin or just getting access) plus on st. economy. In fact economy in mods and maintainence, the latter in labor as well as money.
Gotta get this Carter YA runnin right.
If unable, I may go H/W 32/36 ($65 stove bolt) if it is low enuff to fit under my hood.
Thanks again.
go fast for less is helpful (my 2nd look) for me due to indepth coverage of theory. I may buy the brother's falcon performance book. The 2 'advances' & some of the 'ignition' were educating also (i sorely need that n more). The carb stuff not so much so. He seems to be a racer n I want low rev power (off rd working in the swamp & on hills, haulin or just getting access) plus on st. economy. In fact economy in mods and maintainence, the latter in labor as well as money.
Gotta get this Carter YA runnin right.
If unable, I may go H/W 32/36 ($65 stove bolt) if it is low enuff to fit under my hood.Thanks again.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
Postmaster
Joined: Dec 2006
Posts: 3,603
Likes: 10
From: Spokane, WA
Yes, I was referring to the money. The GM module is cheap compared to other modules. They do get hot and require mounting on a substantial heat sink but they are cheap enough one can keep a spare in the glove box.
Logistics Pro
Joined: Nov 2009
Posts: 3,885
Likes: 12
From: Lawrence Swamp
Right now it's a little complicated for me, thought I had the DSII figured (0 vac line carb/dizzy; new/recurved dizzy; module, new coil; new plug wires). What would the GM 4 pin replace? just the module? I'm tryin to ditch the vac line and points/condencer. Later, if needed (I think i need more than the standard carb re-build kit sold, have air leaks) a different carb.
Thanks,
Mr. Ignorant
Thanks,
Mr. Ignorant
Thread
Thread Starter
Forum
Replies
Last Post
1986F150six
Ford Inline Six, 200, 250, 4.9L / 300
10
Feb 25, 2013 01:21 PM
