carb question...smog control?

[Anonymous]

I have a question...what is the difference between a carb that fits a 65-76...and a carb that fits 68-70 6 cyl.

someone told me they made some smog rule changes..

would it be better to get a 67 or a 68...does one have more power?

oyé so many nuances...

thanks guys
Chaz

 

[CoupeBoy]

I thought the difference was the Spark Control Valve (SCV). The early carbs had it, the later carbs didnt. '68 was the first year for the dual advanced dizzy.

-ron

 

[Anonymous]

Stock 68 Autolite 1101's have a smaller venturi as well.


BIll

 

[Anonymous]

smaller venturi is better...right? When not a WOT, the gas consumption i sless...if I have that straight.

so no SCV is better? Does the dual dizzy take care of that with a vacuum advance?

 

[CoupeBoy]

smaller venturi is good for better low end torque but will choke you at higher RPMs. I believe the '68 dizzy uses vacuum from a vacuum tree that is screwed into the intake log right under the carb, so no need for SCV.

-ron

 

[Anonymous]

maybe I should get a 67 carb then...better at higher rpm's...correct? What would YOU do?

can I use a 67...? what do I do about the SCV?

 

[CoupeBoy]

What would I do?
2v on adapter with vacuum hooked up directly to the log.
Here is the adapter I made for my buddy's '66 (in the pic below) and we converted him to D2 a couple weeks ago. I will get some more pics when I get the air cleaner baseplate made and the bellcrank to hook up the throttle rod.
http://phlegm.us/FordSix/tech/Induction/Carb_Adapt/DIY/Make_Your_Own.html

or buy a 1 to 2v adapter
http://phlegm.us/FordSix/tech/Induction/stovebolt/stovebolt.html

When setup properly a progressive 2v will have a smaller venturi during cruising and an additional 2nd venturi when under load or accellerating. And if I had half a braincell when I started this project I would have bought a 2v from stovebolt, 65$ rebuilt instead of rebuilding it myself) and that chunk of aluminum cost me 6$ and some of my personal time, however it could have been made on a drill press but luckily I had a nice older fella with a mill/drill that did the drilling for me.

I had the time and access to the hardware so it made sense for me to make my own, this may not be the path you want or one that is available for you, but you asked..

-ron

 

[Anonymous]

which is the one from stovebolt...the second or third picture down?

The second picture seems like it would NOT have a hood clearance issue...is the third one from Clifford?

hmmm..plus stovebolt's adaptor AND carb are less than a rebuilt 1bbl.

damn, now I am swayed the other way..

 

[CoupeBoy]

none of those is the stovebolt adapter..
This is the stovebolt, I bought it and then decided to make my own.

Lots more pics of the adapter with a '74 head HERE

That is right after I got it out of the box, the adapter I built cost me 6$, the stovebolt is 15$ (plus shipping) and he got me that one in 2 days also pictured is a partial throttle linkage kit, which I might use the additional throttle rod out of, but I have no use for that extra bell crank. With the stove bolt you either have to bolt it on top of your factory water heater spacer, or do what ducktang did and mound the carb slightly sideways.

http://www.geocities.com/dualsprings/ducktangpage2.html

And of course you will have to decide how you are going to put an air cleaner on it. I looked for a Pinto or Vega unit for a while, but couldnt find one in a condition that I liked so I have decided to make a baseplate adapter and use a 10" edelbrock unit I have in storage. Somewhere on my webserver I have the important measurements for making your own adapter, I made that one out of 3/4" aluminum, but I would like to make one out of 1/2" next time, its a funnel, either way you look at it.. So I dont know how much difference it will make with the 1/4" height difference.

I would love to tell you that this has all worked and been happy but I havent put it together yet, but I will soon. Heck, I might even get off my lazy but and finish figuring out this stuff later tonight..

-ron

 

[Anonymous]

so you made this?

are you using it now?
that seems to be the best one I have seen.

any chance of my PAYING you to get another one made?

It seems that I would NOT have to use a drop base air cleaner with that...

I was given a real thin air cleaner that might work for me in the interim..

I am impressed you made that one.
Chaz

 

[CoupeBoy]

Ya I wish I could find a foundry that could make me somehting like that. But you see the 2 holes across the middle? The will not line up with the bolts in the stock log. I made

not quite as pretty but the bolt holes line up and like I said, I want to try to make one 1/4" thinner but that will have to wait till i get the first one installed.

-ron

 

[Anonymous]

heres a nice little thingy...an adaptor for a 5200 to a factory air cleaner...

I wonder how much height this adds...

.http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=2409563319