Ahh, finally my own dual quad tunnel ram

Discussion in ''Da Nailhead' started by Mr62Wildcat, Aug 10, 2017.

  1. Mr62Wildcat

    Mr62Wildcat Guest

    This is the beginning of my concept of a dual quad aluminum tunnel ram. Pics to be uploaded soon. My pics are too big to upload.

    Any thoughts????

    BTW, the parts are all water jetted aluminum.
  2. dual-quadism

    dual-quadism Black on Black

    Should be easy design, should look like an Algon injection setup with a plenum and carbs on tap. Do yourself a favor and call Hogan Induction. You'll save yourself a ton of work. Runner length is key and "line of sight" down the port to the intake valve is key. There is way more to the nuiances of it, but follow that outline and you are on the right track.
  3. CameoInvicta

    CameoInvicta Well-Known Member

    Runner length, plenum volume, and port architecture are all very important. Love to see your idea!
  4. Mr62Wildcat

    Mr62Wildcat Guest

    I dont care about the runner volume, port archetecture and all that stuff. thats what edelblock is for.... if that was the case I would have a million dollar business with flow benches, engine dyno's, and all that crap. the only thing I can tell you is that the tubes will be square aluminum and 6 degrees of angle from the bottom of the box to the intake ports. I cant seem to post a pic, my pics take up more that what this website allows.... UGH!!!! guess I will have to shrinky dink it...
  5. Mr62Wildcat

    Mr62Wildcat Guest

    Here's the basics.....

    Attached Files:

  6. 1972Mach1

    1972Mach1 Just some guy.....

    So you are just building for looks?
  7. 8ad-f85

    8ad-f85 Well-Known Member

    An hour with some plug and play math would get you 85% there, without the rest of the equipment.
  8. ttotired

    ttotired Well-Known Member

    So from the pictures, your just showing the plenum and there is still tubes and manifold plates to come?

    If so, that plenum looks massive, I don't think you will get much of an idle?

    I am not an engineer, so shoot me down if you like.

    I keep tossing around tunnel ram or blower for my 364 (blower is winning) so I will have to make a manifold as well at some point
  9. wkillgs

    wkillgs Gold Level Contributor

    Looking forward to the result!
    There are some basic intake design calculators on the Wallace Racing site. Would be a good idea to give it a shot to at least get the sizes fairly close.
    Maybe some of us here can crunch some numbers.
    There might be other ones somewhere on the main page:

    Here's a cutaway pic of the nailhead intake. Note the intake flange is at an angle, so the opening looks larger than it is. Bob had mentioned a cross section area about 2.0 inches, so runner size around 1.4" x 1.4" (square) or 1.6" diameter (round) would be ballpark.
    8ad-f85 likes this.
  10. Mr62Wildcat

    Mr62Wildcat Guest

    I am thinking about 8 inch riser tubes... straight shot into the "box" It's mainly for looks as i already have a blower.... Just never seen one on a nail...
  11. Mr62Wildcat

    Mr62Wildcat Guest

    BTW, everything is for looks, its the guys with $$ that use it for other unintentional purposes, like horsepower or something like that stuff....
  12. 8ad-f85

    8ad-f85 Well-Known Member

    Your Limiting Port Velocity computed from your Cross Sectional Area of 1.94 sq. in.
    and Bore of 4.340 in. and Stroke of 3.64 in. and Peak RPM of 4800 is 598.82 fps.

  13. Mr62Wildcat

    Mr62Wildcat Guest

    That's all in the RPM's? My Buick has a wierd power band... it hits around 3200, then RPM's go up to 5800, then wierdly, the engine sees a extra power gain and jumps up to 7200 really fast.... must be the cam, right? lol

    What's the HP?

    Oh, and the Tunnel ram top part is only 3" tall
  14. 8ad-f85

    8ad-f85 Well-Known Member

    I just plugged the area from 1.4" x 1.4" and subtracted some corner radius .
    On a stock 364...
    Your Limiting Port Velocity computed from your Cross Sectional Area of 1.94 sq. in.
    and Bore of 4.125 in. and Stroke of 3.391 in. and Peak RPM of 5800 is 608.94 fps.

    7200 is 755.93 fps.

    Just plugging in numbers, didn't measure or verify anything.
    Obviously, that's the runner size, not necessarily the MCSA.
    I can see it peaking near 6k and pulling to 7200 no problem, with a 1.8 rod ratio and a wide LSA cam helping things past peak. (Some of my 327's pulled well past 8k when the hp peak was more like 6800)
    Kind of reinforces that the Nail heads work well on the smaller package.
    Keep in mind the velocity numbers work independently of CFM numbers and that power peaks aren't as strictly controlled by the cams as people think.
    A little bit of math explains many mysteries and dispels much tribal 'knowledge'.

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