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intake spacer vs intake swap

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    #1

    intake spacer vs intake swap

    OK, disclaimer, this is for a Chevy motor but that shouldn't really matter for this specific question.

    I've got a dual plane intake on my boat motor thats set up so the left and right sides of the carb feed different levels of the intake. The intake thats on the motor right now was originally graced with a Quadrajet, and I need to use my Weber (identical to an Edelbrock) on it. The throttle plates on the Weber are larger than the front holes on the intake, so it won't open. I was thinking of just getting one of those open 1" phenolic spacers to put under the carb so things worked normally. Is that going to screw up how the dual plane part works? If it will mess it up too bad I guess I can swap the intake but honestly I don't feel like it.
    86 Lincoln Town Car (Galactica).
    5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley

    91 Lincoln Mark VII LSC grandpa spec white and cranberry

    1984 Lincoln Continental TurboDiesel - rolls coal

    Originally posted by phayzer5
    I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers

    Everything looks like voodoo if you don't understand how it works
    Tags: None
    #2
    Yep, that'll mess up your dual-plane function. I've had (extremely!) good luck with my four-hole 1" spacer on the Mercury .... what about maybe getting a four-hole spacer and modifying it for throttle plate clearance?

    Though ... I thought Quadrajets were spreadbore?
    2012 Mazda5 Touring | Finally working on the LTD again!

    Comment

      #3
      Qjets are spread bore, the Weber is not. Thats the problem, the Weber's primaries are much larger than the primaries on a Qjet, which makes the throttle plates hit the intake.

      Oh well, I guess I'll just pull the damn intake, much as I don't want to. I'm sure the surprise inside there should be fun. The rotted out valve covers revealed a pretty mix of rust and oil sludge underneath. The lifter galley should prove to be a treat as well.

      Just a tip folks, do not let your engines sit for 5 years in an extremely damp environment. It does not do good things.
      86 Lincoln Town Car (Galactica).
      5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley

      91 Lincoln Mark VII LSC grandpa spec white and cranberry

      1984 Lincoln Continental TurboDiesel - rolls coal

      Originally posted by phayzer5
      I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers

      Everything looks like voodoo if you don't understand how it works

      Comment

        #4
        " I was thinking of just getting one of those open 1" phenolic spacers to put under the carb so things worked normally. Is that going to screw up how the dual plane part works?"

        No. It will work as designed. I have a 1" spacer on the Stealth intake on the racecar. The open spacer will add top end power with no sacrifice of low end.
        What will happen is there will be turbulence in the primaries that may affect low end or mid range. Get an adaptor for a square bore to Q-jet, this will taper the primary bores down to the Q-jet, then add the open spacer to that. All that will raise the carb ~2" higher. Got room?
        Speed cost....how fast u wanna go??

        It's not how much hp u have...
        It's how much hp u can put to the track...

        Let's seperate the men from the boys and put that power to the track using street tires and stock suspension components

        'Tis infinately better to sit quietly and be thought a fool,
        than to speak and remove all doubt.

        I refuse to have a battle of wits with an unarmed person.

        Comment

          #5
          Originally posted by SLYDAWG View Post
          No. It will work as designed. I have a 1" spacer on the Stealth intake on the racecar. The open spacer will add top end power with no sacrifice of low end.
          Interesting, I'd not heard that. I'm running one of those Spectre spacers with both open and four-hole inserts; I'll have to give it a try!
          2012 Mazda5 Touring | Finally working on the LTD again!

          Comment

            #6
            Originally posted by SLYDAWG View Post
            " I was thinking of just getting one of those open 1" phenolic spacers to put under the carb so things worked normally. Is that going to screw up how the dual plane part works?"

            No. It will work as designed. I have a 1" spacer on the Stealth intake on the racecar. The open spacer will add top end power with no sacrifice of low end.
            What will happen is there will be turbulence in the primaries that may affect low end or mid range. Get an adaptor for a square bore to Q-jet, this will taper the primary bores down to the Q-jet, then add the open spacer to that. All that will raise the carb ~2" higher. Got room?
            Room I have. The factory intake on the right engine is about an inch taller than the Qjet intake on the left engine. I have probably another 2-3 inches above the flame arrestor on the right motor so clearance isn't an issue. If it is, I can just cut into the 3" of foam on the underside of the decklid.

            Its the whole bolting up of things that I'm not sure about. I need to go from a non-spread bore carb to a spread bore intake, not the other way around. I am not using the Qjet. Bolt pattern is the same on both the Weber and the Qjet but my Weber has 4 equal size holes, and it needs to feed into 2 small and 2 big holes in the Qjet intake. The Weber actually is a dual-bolt pattern carb, it fits to the Qjet pattern and I assume the other is the standard Eddy/Holley pattern.

            Losing low end is a huge problem on a boat, ideally I need to make it run the same as the other engine in there. More and more I'm thinking I'm going to have to do the intake swap to make that happen. Thats sort of the problem with twin engine installs, both motors need to run pretty equally to get optimal performance.
            86 Lincoln Town Car (Galactica).
            5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley

            91 Lincoln Mark VII LSC grandpa spec white and cranberry

            1984 Lincoln Continental TurboDiesel - rolls coal

            Originally posted by phayzer5
            I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers

            Everything looks like voodoo if you don't understand how it works

            Comment

              #7
              Edelbrock makes adapters for that, they have four separate bores so there's no crossover of flow under the carb and above the intake. Adapter is aluminum, cost about $40-45, and generally can be had at your local part's store performance section.

              Comment

                #8
                you can also modify a dual plane intake to make more power up high by removing some of the divider. when i did my head swap i tapered the top edge of my divider since i have an open nitrous plate above it, to help reduce turbulence inside the manifold
                http://secondhandracing.com/Home.aspx
                http://secondhandradio.com/

                R.I.P. Jason P Harrill 6-12-06

                http://www.grandmarq.net/vb/showthread.php?t=5634

                Comment

                  #9
                  Originally posted by DuceAnAHalf View Post
                  you can also modify a dual plane intake to make more power up high by removing some of the divider. when i did my head swap i tapered the top edge of my divider since i have an open nitrous plate above it, to help reduce turbulence inside the manifold
                  What manifold do you have, again? A Weiand Stealth?
                  2012 Mazda5 Touring | Finally working on the LTD again!

                  Comment

                    #10
                    RPM air-gap

                    RIP Jason P Harril, we'll miss ya bro

                    '80 Town Coupé
                    '84 Towncar - Teh Cobra TC, 408w powered
                    '16 Ram 1500 CC Outdoorsman, Hemi/3.92/8sp 4x4

                    Comment

                      #11
                      Originally posted by 1987cp View Post
                      What manifold do you have, again? A Weiand Stealth?
                      justin is correct, i have an edelbrock performer RPM air-gap, it is a dual plane intake, but the runners are raised like a single plane intake
                      http://secondhandracing.com/Home.aspx
                      http://secondhandradio.com/

                      R.I.P. Jason P Harrill 6-12-06

                      http://www.grandmarq.net/vb/showthread.php?t=5634

                      Comment

                        #12
                        Vic Jr. airgap intakes are teh shizit

                        RIP Jason P Harril, we'll miss ya bro

                        '80 Town Coupé
                        '84 Towncar - Teh Cobra TC, 408w powered
                        '16 Ram 1500 CC Outdoorsman, Hemi/3.92/8sp 4x4

                        Comment

                          #13
                          Originally posted by phayzer5 View Post
                          Vic Jr. airgap intakes are teh shizit

                          Redundant...... see redundant.......

                          Comment

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