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Hot Rods Question about a tunnel ram dual quad

Discussion in 'The Hokey Ass Message Board' started by Dmont37, Apr 7, 2016.

  1. Dmont37
    Joined: Jul 17, 2010
    Posts: 61

    Dmont37
    Member

    I have a 318 30 over with a 292 duration with a 508 lift and has 360 heads on it. The car that it's going in will have 8 3/4 rear it with a sure grip 391 gears. I was wondering if the 318 30 over could handle a dual quad tunnel ram with two 600 cfm carbs.
     
  2. Jalopy Joker
    Joined: Sep 3, 2006
    Posts: 26,952

    Jalopy Joker
    Member

  3. Fitty Toomuch
    Joined: Jun 29, 2010
    Posts: 248

    Fitty Toomuch
    Member
    from WVa

    Iv`e seen it done.
     
  4. Blue One
    Joined: Feb 6, 2010
    Posts: 11,103

    Blue One
    ALLIANCE MEMBER
    from Alberta

    One thing I have discovered through personal experience is that a tunnel ram is not a street friendly manifold.
    They are designed for a radical race engine and race conditions.
    When used on a street engine they are there mainly for looks and driveability will suffer.
    Not a good street manifold.
     
    dana barlow likes this.

  5. birdman1
    Joined: Dec 6, 2012
    Posts: 1,218

    birdman1
    Member

    they use those carbs on 302 Fords, work fine. use progressive linkage, and learn a "feel" for the throttle.
     
  6. Dmont37
    Joined: Jul 17, 2010
    Posts: 61

    Dmont37
    Member

    Car going to be for car show and maybe go to the strip
     
  7. 6-71
    Joined: Sep 15, 2005
    Posts: 542

    6-71
    Member

    I am no expert,but have used a tunnel-ram on the street,they look cool,but will not perform well on a mild street engine.
     
  8. Larry T
    Joined: Nov 24, 2004
    Posts: 7,667

    Larry T
    Member

    I've run tunnel rams on several cars and never had any problem with them.

    I've never run progressive linkage, because I always figured a tunnel ram would be more sensitive to distribution problems than a low profile intake. Vacuum secondary carbs will go a long way to covering up over carb problems.

    And I always run a 3000 + converter.

    international McKenzie McKayla.jpg
     
    Last edited: Apr 7, 2016
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  9. chriseakin
    Joined: Jan 21, 2009
    Posts: 381

    chriseakin
    Member

    Rod and Custom put a tunnel ram on a 340 but they used a single four barrel - the manifold was a two piece so you could change what you ran without changing the whole thing. They said it was no problemo.
     
  10. 69fury
    Joined: Feb 24, 2009
    Posts: 1,419

    69fury
    Member

    you can do it and make it run nice- will it be optimized? no. will it be cool? probably. you'll have to monkey with it at first, but it shouldn't be too hard.-rick
     
  11. prpmmp
    Joined: Dec 12, 2011
    Posts: 1,077

    prpmmp
    ALLIANCE MEMBER

    I have a 302 ford roller motor with a b cam(284 dur-498lift?)gt40p heads,limefire headers.pertronics dis.,5spd stick in a glass 32 3 window(2640 with me in it)old wiend tunnal ram 2 390 vac sec carbs in sink.stock squarter is a 25 went up to a 35,stock jets 51(.050 drill hole) went to a #67(.068 drill hole),6.5 power valve.purple sec spring. stock squarter is a none tube type,guy a drill set # 0-60,drill out the squarter and jets till u dial it in it will save u money from buying squarters and jets(when dialed in buy what u need in the sizes that work) at idle i have 20 on the vac guage at highway i have 12 so when i step on it the vac drops below 6.5 the power vale opens and then the secs open with no bog,same with the squarter to help with the transfer to primary circuit. I also had to adjust the secondary throttle plates to close them to bring the idle down to 800rpm(1/4 turn counterclockwise). This was my setup,Ran great and very streetable!! Pete
     
    Last edited: Apr 7, 2016
  12. Hollywood-East
    Joined: Mar 13, 2008
    Posts: 1,453

    Hollywood-East
    Member

    I have been running tunnel rams as far back as the TR-1( 18 in hi-school) then i was "blown" mid 20's never looked back, Now 25yrs. Later I bought a beat up truck that made "farm truck" look like nos, it had a 350 Chev with a tunnel ram w/msd ignition, I believe it was purchased as a "kit" I believe the carbs are 450cfm or 500 don't remember, But I am here to tell you, I was at the track with it idling an two Guy's walked up an peaked under the hood an both said I take back all my reservations Now on run'n a tunnel ram, it starts with no choke, two pumps on pedal in 15 below Zero , an will idle in two minutes, Whatever you do run mechanical secondaries! If you do run Holly vacums, You have to run a kit they used to offer that comes with two lids for the vacuum secondaries that connects w/a vacuum line..and got 15mpg.
     

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    Last edited: Apr 7, 2016
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  13. tfeverfred
    Joined: Nov 11, 2006
    Posts: 15,792

    tfeverfred
    Member

    Isn't the power band for most tunnel ram set ups, 3,500-7500? Hardly any low end torque? Just what I've read. Is my source correct?
     
  14. ace5043
    Joined: Sep 28, 2008
    Posts: 130

    ace5043
    Member
    from Florida

    IMHO & experience the smaller carbs such as two 390's would be optimal for street use.
     
  15. Blue One
    Joined: Feb 6, 2010
    Posts: 11,103

    Blue One
    ALLIANCE MEMBER
    from Alberta

    Yes, it is fairly accurate. One reason why they are not street friendly.
     
  16. falcongeorge
    Joined: Aug 26, 2010
    Posts: 18,341

    falcongeorge
    Member
    from BC

    OMFG!! REALITY intruding into a tunnel ram thread on the HAMB???!!!:rolleyes::D:D Oh, SAY IT ISNT SO!!!
     
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  17. Larry T
    Joined: Nov 24, 2004
    Posts: 7,667

    Larry T
    Member

    The 292 cam matches up better with a tunnel ram than it does with "low end torque".

    I ran 2 750 Edelbrocks on my last set up, but it was a Brodix headed/roller cammed 468.
     
  18. prpmmp
    Joined: Dec 12, 2011
    Posts: 1,077

    prpmmp
    ALLIANCE MEMBER

    Yep!! I lied about being street friendly!! As you can see in the video that the car ran like pure SHIT!!! Pete
     
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  19. 2OLD2FAST
    Joined: Feb 3, 2010
    Posts: 3,377

    2OLD2FAST
    Member
    from illinois

    I have run a street tunnel ram for 12 years now...tried 2x390 2x450 2x600...the small carbs responded at low rpm , the 600's at high rpm , but the 450's were the best over-all' you do need to learn what they will and won't do.I am running a manual trans. which makes driving easier IMO , if running an auto trans ,I'd guess a "loose" converter would be the way to go..
    dave
     
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  20. Dmont37
    Joined: Jul 17, 2010
    Posts: 61

    Dmont37
    Member

    Thanks for all the advice and the video was badass.
     
  21. Blue One
    Joined: Feb 6, 2010
    Posts: 11,103

    Blue One
    ALLIANCE MEMBER
    from Alberta

    Lighten up and relax Pete. Don't get your panties all in a wad.
    Everything isn't all about you.
    It's like anything else, there is always the disclaimer that says your results may vary. Or results not typical. :D
     
  22. prpmmp
    Joined: Dec 12, 2011
    Posts: 1,077

    prpmmp
    ALLIANCE MEMBER

    OK!! I feel much better now!! It isn't like you to criticize things on this forum:eek:!! You are always so nice:p!! Pete (I don't wear Panties!! I go Commando:eek:!!)
     
  23. Blue One
    Joined: Feb 6, 2010
    Posts: 11,103

    Blue One
    ALLIANCE MEMBER
    from Alberta

    Too much information Pete :D I am as nice as any old opinionated SOB, similar to yourself :D
    Aren't we having fun ?
    By the way, I am close to ordering the same tires you presently have on your coupe.
    Just have to get over the sticker shock :confused: Not to mention the exchange rate.
    Larry.
     
  24. prpmmp
    Joined: Dec 12, 2011
    Posts: 1,077

    prpmmp
    ALLIANCE MEMBER

    Yes Larry us old dudes do get cranky:)!! You will love the tires!! Pics when you get them!!! Will your car be on the for the summer?? Pete
     
  25. Weiand's p/n 1984 (sbc) is rated 2800-8000. Mine runs awesome with 500 Eddy's and a 2500 stall. Straight linkage.
     
  26. falcongeorge
    Joined: Aug 26, 2010
    Posts: 18,341

    falcongeorge
    Member
    from BC

    Both the first gen Weiand's and the Edelbrock TR-1YX's have excellent low end grunt. Most guys have no idea how to tune carbs, and they dont want to admit it, so they blame it on the intake. Really, just do the math at look what happens to peak torque with the runner CSA stays the same, and the runner gets longer...:rolleyes:
     
  27. harley rider
    Joined: Aug 11, 2010
    Posts: 527

    harley rider
    Member

    dyno shoot out. tunnel ram vs dual plane.
     
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  28. Blue One
    Joined: Feb 6, 2010
    Posts: 11,103

    Blue One
    ALLIANCE MEMBER
    from Alberta

    I'll put some pictures up when I get them, I don't think I'll make the road this summer, it seems like I'm getting close but there are a ton of small things to do.
    I'm going to tear it all apart and start painting and finishing everything. So that takes time.
    Also doing removable cycle fenders for easier registration inspection, even though running fenderless afterwards is not a problem.
    Time, money and the usual long list of build tasks, nothing out of the ordinary in this hobby. :)
     
  29. Black Panther
    Joined: Jan 6, 2010
    Posts: 1,762

    Black Panther
    Member
    from SoCal

    Great video! Thanks for posting it..
     

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