Look what I found now..A D66 Dual Quad Intake for a SB

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    Author Topic: Look what I found now..A D66 Dual Quad Intake for a SB  (Read 7601 times)

    Offline dodge freak 2

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    Look what I found now..A D66 Dual Quad Intake for a SB
    « on: March 10, 2009 - 05:35:29 PM »
    What can I say, I get my little motor running nice and now am going to put two 4 bLL carbs on. Yes I understand it can make more power with a nice DP carb and a good intake manifold but thought why not give it a shot and see how it goes.

    Does anybody knows what the hole in between the carbs is for, the linkage back then, a choke..
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    Offline 71chally416

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    Re: Look what I found now..A D66 Dual Quad Intake for a SB
    « Reply #1 on: March 10, 2009 - 06:16:34 PM »
    The idea with modern sheetmetal tunnel rams is to position the carbs barrels right over the runners. That's the whole reason for split-Dominators that are mounted off-set. It's very odd that the front barrels of that intake are aligned with the 3-4 cylinders while the rear carb is in a much better position. I would guess the front two cylinders will run lean and the second two will run ritch, but who knows?  It's old technology. Try it and see what happens.
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    Offline dodge freak 2

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    Re: Look what I found now..A D66 Dual Quad Intake for a SB
    « Reply #2 on: March 10, 2009 - 06:39:49 PM »
    What I was able to find out was for the street the back carb is the primary and the front carb should be set up so the carb starts to open at half throttle and all carbs are open at WOT. For race or track use the linkage is set up 1 to 1.

    Edelbrock has re-release these intakes for SB Fords and Chevy's..maybe the 440's Mopars. They all look pretty much the same. Edelbrock recommends its 500 carbs which are tune for the dual carbs but funds are tight as tight here thank to this Depression Michigan is in. I have some 600 carbs I thought I use...the factory used to run a pair of 600's. Maybe 1 to 1 linkage is the way to go always.

    Its going to be mid summer when I do the swap so I can take my time tuning.

    Just wondering why that hole in between the carbs, it on both sides too.   

    I have some old Hot Rod magazines form late 60's early 70's they claim it work pretty good for the street...they also say 4.10 gears are a good compromise on the street too, ha ha. Well I have 3.91's and think they are OK even at high speed so maybe I like the quads too.

    They liked it better than the 6 pack set up since 4 bll's will open up as soon as you punch it, unlike the 6 pack. 
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    Offline Chryco Psycho

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    Re: Look what I found now..A D66 Dual Quad Intake for a SB
    « Reply #3 on: March 10, 2009 - 08:15:51 PM »
    yes & no the secondaries on the Carters are mechanical but with a air flow limiting air door that is vaccum operated just like the 6 pack , the 6 pack can also be had with mechanical secondaries
    BTW no clue what the hole is for between the carbs
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    Offline dodge freak 2

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    Re: Look what I found now..A D66 Dual Quad Intake for a SB
    « Reply #4 on: March 10, 2009 - 08:56:00 PM »
     True, a good tuner can do so much. This isn't any higher than the 340 intakes, the 6 packs sit much higher up and needs a hood scoop.

    Thinking of painting it the old 340 orange colour?..  :clueless:
    « Last Edit: March 10, 2009 - 08:58:41 PM by dodge freak 2 »
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    Offline moper

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    Re: Look what I found now..A D66 Dual Quad Intake for a SB
    « Reply #5 on: March 10, 2009 - 09:24:18 PM »
    I dont think I'd try 1:1. The preferred are the 500s, but you could use the 600s. Like CP says, the air doors may never open fully but that's ok. I think you'll find the progressive setup is much more responsive.
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    Offline 71chally416

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    Re: Look what I found now..A D66 Dual Quad Intake for a SB
    « Reply #6 on: March 10, 2009 - 09:30:09 PM »
    Ya might wanna experiment with some carb spacers too. SB Mopes seem to like plenum volume and that Intake doesn't look to have much.
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    Offline Changin Gears

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    Re: Look what I found now..A D66 Dual Quad Intake for a SB
    « Reply #7 on: March 10, 2009 - 09:31:23 PM »
    Definitely has the 'cool' factor about it since you never see them.  I think it would have plenty of CFM even if the secondary’s never opened.
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    Offline 72hemi

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    Re: Look what I found now..A D66 Dual Quad Intake for a SB
    « Reply #8 on: March 10, 2009 - 10:12:11 PM »
    Offenhauser still makes a dual quad manifold for the small blocks. I have one on my car. I am running dual Carter 625 (those musclecar carbs that were remade a few years ago). I also have a 1" spacer and Edelbrock progressive linkage. The rear carb has an electric choke and the front choke is wired open and the idle screw on the throttle linkage backed all the way out. It looks cool especially with the stock hemi air cleaner on there. I was running 3.91 gears and now have 3.23 gears. It ran a lot better with the 3.91's compared to the 3.23's. Higher rpm runs real strong, low end not so much. Definitely no conisistancy with the cylinders however some are a little lean and some a too rich. I am going to remove mine as I am driving the car more and it does not do what I want at the moment. Although i will say I do get 15 mpg on the highway with the 3.23's and the dual 625's. For now I will probably go with a rpm air gap with a thunder avs 800, but long term I am going to a 6 pack. I have had gotten more performance out of the 6 pack compared to the dual quads.
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    Offline 71chally416

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    Re: Look what I found now..A D66 Dual Quad Intake for a SB
    « Reply #9 on: March 10, 2009 - 10:27:29 PM »
    Quote from: 72hemi on March 10, 2009 - 10:12:11 PM
    For now I will probably go with a rpm air gap with a thunder avs 800

    Excellent choice  :thumbsup: I doubt that you will do much better than that unless you have some monster heads that the Intake can't support.
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    Offline femtnmax

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    Re: Look what I found now..A D66 Dual Quad Intake for a SB
    « Reply #10 on: March 10, 2009 - 11:07:58 PM »
    Obviously the obvious, your intake is meant to be dual 4bbl and dual plane with longer runners for more low end torque vs a single plane with the short straight shot runners.
    Does the drivers side plenum connect both front and rear carbs??  Looks like it does.    Might work better than expected.
    According to Ford SAE papers on lessons learned during LeMans 427 racing, the sharp corners at the bottoms of the throttle bores should be rounded off to a 1/2 inch minimum radius so fuel stays mixed better rather than shearing and seperating. 
    « Last Edit: March 11, 2009 - 09:09:34 AM by femtnmax »
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    Offline dodge freak 2

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    Re: Look what I found now..A D66 Dual Quad Intake for a SB
    « Reply #11 on: March 10, 2009 - 11:26:54 PM »
    Offy are a single plane with a divider, this intake is a dual plane like the six pack and stock manifolds. Yes the plenum connect both front and rear carbs.

    I will agree the newer RPM intakes and a 650-750 DP carb are very hard to beat...what I am running now.

    I would "love" 15 MPG on the highway...I get 9 MPG now but driven stop and go and not pussy footing around.

    But right now its running very well, I could give up a bit of power and still hang with many around my area. I have a nice clean AVS 4615 and it ran smooth around town but was off the power-but still pulled good at top end, so if I have two AVS like the Super Stockers ran but then elect choke is nice. I have one of those 600 Eddy carbs rebuilt and that AVS...might have to lighten up the seconday weights on the Eddy and like one turn on the sec. spring.

    I'm getting "old" too, if I can tune it for a bit more MPG for long highway trips and still can have a good pull the second I punch it--and it runs smooth at all rpms, I be happy, even if power is off a bit.

    I think tuning is going to be the key, spacers-open and 4 hole, jetting, secondary timing....yeah about the sharp corners at the bottoms of the throttle bores should be rounded off to a 1/2 inch minimum radius so fuel stays mixed better rather than shearing and seperating. Might be true but I'm also running a hot MSD 7 al box and HVC coil with a E-curve msd dist..(got it while times were good)...it really helps to burn the fuel up, even running a little rich the plugs stay clean -but times go down. 

    Besides some 6 inch air filters and I have the "oh wow" factor down good...maybe be a "chick magnet", lol  ;D
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    Offline dodge freak 2

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    Re: Look what I found now..A D66 Dual Quad Intake for a SB
    « Reply #12 on: March 10, 2009 - 11:40:38 PM »
    What I seen about running the back carb as the primary was its the closes to the middle of the intake. If you run the first carb as the primary the front Bll's would open way up front---unless you run the carbs backwards which some did back then but then the throttle cable would be a pain to set up and I see no point of it.

    But I am "stuck" with Carters-Eddy carbs  :-[ no holleys what so ever. But my old AVS carb did give it a very nice smooth idle, even cold. I hear your fuel pump needs to be good too, since those carbs hold less fuel.

    The way I see it, I always can E-bay it if it doesn't work as plan but I see some happy owners threads on the Chevy boards-since Eddy still sells those intakes new for those motor, same with Fords, claim they can get good power and MPG--if they keep their foot out of it.
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    Offline dodge freak 2

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    Re: Look what I found now..A D66 Dual Quad Intake for a SB
    « Reply #13 on: August 20, 2009 - 03:08:32 PM »
    Its going on today  :cooldancing:

    Found two old brand new Carter 500's carbs. 9502 with no choke or vacuum ports tap. I ran the one 500 carb this week and it started just fine with no choke-yeah its warm outside but it should be OK this Fall.

    Those ports are small like the 273-318 but I believe it sealed up good..I know tomorrow. UPS is bring the 2nd carb then...it has to be good I hope, coming from an Ebay shop in California.

    The little 500 was down on power compare to my Demon 650 DP but wasn't too bad. Secondary's kick in fast and my MPG went from 9 mpg to 11 mpg. That was while playing around with the jets just to see if I could improve it, nope was jetted right on.

    Idle a bit better I thought but seem off by 50 HP, hopefully with two carbs it be pretty close to what it was and if I could get better MPG it be worth it. That Demon always suck the gas down no matter what. I bet a steady 55 mph it get 14 MPG with the Carter even with 3.91 gears.

    I post some pictures tonight.   
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    Offline dodge freak 2

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    Re: Look what I found now..A D66 Dual Quad Intake for a SB
    « Reply #14 on: August 20, 2009 - 03:14:04 PM »
    Quote from: moper on March 10, 2009 - 09:24:18 PM
    I dont think I'd try 1:1. The preferred are the 500s, but you could use the 600s. Like CP says, the air doors may never open fully but that's ok. I think you'll find the progressive setup is much more responsive.

    Been looking at old 1970 Hot Rod mags, the trick was to remove one of those secondary doors-flaps. Not just remove some weight but just remove the flap all together. I see once I feel its jetted right on. Might be best with 4.56 gears thou.

    Tuning is going to take some time I believe...was debating all week if I really want to take a chance. Motor was running really great all summer but guess I always could go back.
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