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Projects 9 sec. 38 Dodge truck build

Discussion in 'The Hokey Ass Message Board' started by mcmopar, Jan 11, 2020.

  1. flamedabone
    Joined: Aug 3, 2001
    Posts: 4,730

    flamedabone
    ALLIANCE MEMBER


    Power is not going to be a problem. Getting it out of the hole with that much power and a manual transmission is always a bit tricky.

    September will be here before you know it. Warm up the credit cards and lets get this project rollin.

    -Abone.
     
  2. Truckedup
    Joined: Jul 25, 2006
    Posts: 3,865

    Truckedup
    Member

    You need to run 8's like this Chevy....No huge engine sticking out the hood or frame twisting out of the hole..Just a Chevy 6 cylinder...;)
     
    48fordnut, swade41, IronFord and 7 others like this.
  3. mcmopar
    Joined: Nov 12, 2012
    Posts: 1,549

    mcmopar
    ALLIANCE MEMBER
    from Strum, wi

    Yep they are Magnesium Halibrands, with a 5 x 5 bolt pattern, and I am looking for a front set for this one, just not sure what ones yet. If anyone has a set lying around that you are not using send me a pm. I am also looking for a set of Romeo Palimades for my other truck.

    Mat, love your truck. I also understand what Gene is saying, I know my small block truck will see a lot more street driving than hemi truck. It will be able to be driven on the street, but it wont be a daily driver. I agree with everyone that it can be done but in reality how many miles do you put on your 9 sec vehicle. If I put 3000 miles a year on it it would be a lot, compared to 10 to 15000 miles on my small block. In the end it will be driven as often as I want to.
    Tony
     
  4. mcmopar
    Joined: Nov 12, 2012
    Posts: 1,549

    mcmopar
    ALLIANCE MEMBER
    from Strum, wi

    Who said anything about a hood, and why wouldn't you want a huge fire breathing, air gulping, fuel drinking, noise making, kid loving, grandma scaring engine sticking out. My wife doesn't understand why I am building this but then again she drives a Subaru. She asked why I don't just focus on my 37, and I said it would turn into this eventually. That truck started out as a 15.8 at the H.A.M.B drags in 2017, and this year it will hit 11's. I already know that if I didn't build this 38 I would be putting a cage in my 37 and be looking for 10's with my small block. This way I have the best of both worlds.
    Tony
     
  5. saltflats
    Joined: Aug 14, 2007
    Posts: 10,069

    saltflats
    Member
    from Missouri

    If you ever think you are going to want to go quicker, I would build it for that E.T.
    Building more power will be easier that rebuilding the chassis.
     
  6. Desmodromic
    Joined: Sep 25, 2010
    Posts: 571

    Desmodromic
    Member

    Height of the rails is great for simple beam strength, but does almost nothing for torsional rigidity. Try clamping the front of the frame, put a jack stand under the left rear, and stand on the right rear. I'll bet it will deflect at least 1". Box the frame and try again; deflection probably not measurable. There is no reason for boxing plates to be thicker than frame, thinner could even be OK. Tubular cross members also enhance frame torsional rigidity. Should also have some diagonals ("X" or "K" member) to stiffen against lozenging. The floor or a belly pan can help here, if rigidly attached. Obviously, an engineered tube frame will save a few pounds, if considered important. A 1% decrease in car weight is as good as a 1% increase in power. I have no idea what the rules say about allowable chassis design. Are tube frames ruled out? Is a simple ladder type frame made of rectangular tubes considered to be a tube frame?
     
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  7. Desmodromic
    Joined: Sep 25, 2010
    Posts: 571

    Desmodromic
    Member

    What's happening in this picture is not chassis twist. It is the torque reaction in the drive shaft, which rotates the chassis/body, compressing the right spring and unloading the left spring.
     
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  8. fastcar1953
    Joined: Oct 23, 2009
    Posts: 2,124

    fastcar1953
    Member

    Pardon me. twist , rotate whatever
     
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  9. Desmodromic
    Joined: Sep 25, 2010
    Posts: 571

    Desmodromic
    Member

    Sorry, I misinterpreted your comment, since you specifically mentioned X-frame cars. Such frames are not very rigid torsionally, when not attached to their body. But cars with perimeter frames or unit construction will react the same way, if having similarly soft springs and no traction bars or anti-roll bars. And lifting the front wheels aggravates the problem, since the stiffness of the front springs becomes irrelevant.
     
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  10. oldiron 440
    Joined: Dec 12, 2018
    Posts: 1,507

    oldiron 440
    Member

    Oh boy this is going to be good!!!:)
     
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  11. Marty Strode
    Joined: Apr 28, 2011
    Posts: 4,817

    Marty Strode
    Member

    Nothing wrong with stock rails, properly boxed and braced. This one was built around 1965, and doesn't have the forward cage tubes reaching the front crossmember. The old thumb rule was 1oo lbs equals a tenth of a second in ET. BTW it has run 8.04 @ around 170. 2012-08-31 140633.jpg Bizio Indy 2013.jpg
     
  12. It also drives on a nice smooth track without having to deal with the loads associated with pulling a trailer on pot hole ridden roads. The truck is very fast. I have seen it run many times. Let's not forget its boxed frame has not been tested in a crash.
     
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  13. oldiron 440
    Joined: Dec 12, 2018
    Posts: 1,507

    oldiron 440
    Member

    Maybe it's the collision work I've done but those rails didn't look all that virgin. I'd think better of them if they were more of a straight line, look's like built in flex.
     
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  14. Fitty Toomuch
    Joined: Jun 29, 2010
    Posts: 214

    Fitty Toomuch
    Member
    from WVa

    Mopar in a Mopar, I`m watching, good luck.
     
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  15. flamedabone
    Joined: Aug 3, 2001
    Posts: 4,730

    flamedabone
    ALLIANCE MEMBER

    "CHASSIS •Engine setback is allowed, but the center of the intake manifold (as measured fore and aft) may not be aft of the base of the windshield. •The frame may not have round-tube main rails. •May not have a lowered stance. A raised stance is encouraged."

    It looks like a rectangle tube frame is legal in A/gas. If it were me, I would probably build a rectangle frame from not only for the safety aspect, but also so you aren't confined by the parameters of the original frame design. It is much easier to put shit where you want it when you are the one building the foundation.

    Remember to post lots of pics.

    -Abone.
     
  16. Was thinking the same thing, a lot less compromising.
     
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  17. Hemi Joel
    Joined: May 4, 2007
    Posts: 821

    Hemi Joel
    Member
    from Minnesota

    If you guys were going to build a frame, and you couldn't use round tubing, what size of thickness and grade of steel would you use for the main rails?
     
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  18. Desmodromic
    Joined: Sep 25, 2010
    Posts: 571

    Desmodromic
    Member

    This confirms my suspicion that drag racing rules are sometimes "arbitrary and capricious". What in the word is wrong with a round tube? Rectangular has some ease-of-fabrication advantages, but that should be the builder's decision. Many old dragsters, competition coupes and altereds had round main frame tubes. (I'm not really knowledgable on the rules that govern nostalgia race cars, seems to be a mixture of historical rules, current rules, sanctioning organization, all possibly modified by the particular strip. Are there published rules that are universally accepted?)
     
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  19. Mike Colemire
    Joined: May 18, 2013
    Posts: 1,210

    Mike Colemire
    Member

    With a cage you can use 1/8, 2x3 box, I always used 2x4 1/8 box just because I like safer better than lighter. My step son hit the wall in my 68 Camaro at 135 mph and never got a scratch.
     
  20. jimmy six
    Joined: Mar 21, 2006
    Posts: 6,331

    jimmy six
    Member

    I see this all the time in Pico Rivera and Santa Ana. Standard deal at car show on Sundays and gatherings at city parks on Saturdays.
     
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  21. Hemi Joel
    Joined: May 4, 2007
    Posts: 821

    Hemi Joel
    Member
    from Minnesota


    At Drag Week, they have several classes. The "lower" classes have more restrictions. As you go "up the ladder", each class allows more modifications. If you want to run round tube frame rails, just pick a higher class that allows them.
     
    Last edited: Feb 1, 2020
  22. What does HRP know with his beating his driver all the time......
     
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  23. I'm in for the outcome and how you get there, kinda similar to my 41 Chevy p/u, which by the way is original boxed frame from cab forward and 2x4 tubing out back, 2920 lbs with a full 15 gallon cell. I could've got it lighter but I built it to still haul a few things other than ass, hopefully this year I can get the traction problem under control.
    The Bizio truck is a friend and about 2 miles away and I can attest it's a hard charger with that stock frame, another friend still has the stock frame under his green ScottRods anglia that runs low 5's in the 1/8. Another local guy is the Dirty30 Plymouth sedan that's been 175 mph on stock leaf springs and stock frame that has a round tube inside I believe, he does the no prep thing and the rules call for stock frame.
    So anyway I'll be watching 20200111_003352.jpg
     
  24. mcmopar
    Joined: Nov 12, 2012
    Posts: 1,549

    mcmopar
    ALLIANCE MEMBER
    from Strum, wi

    I haven't thought of going square tube. I also know that a lot of fast cars are using the stock frame, with some reinforcements in it. I might start by mocking everything up on the stock frame and go from there. If I don't like it change it to a built frame. I also don't understand why rectangle aftermarket steel is ok but not round tube.

    As far as going up a class for drag week, I am trying to avoid the unlimited class, as I would like to be competitive. I know it wont be a 6 sec. truck, and it also wont be a bracket truck. I was going to print out a NHRA rule book but then I saw it was 324 pages long. My main goal is to have fun and get it in a class at dragweek that I have a chance of winning.
    Tony
     
  25. Roothawg
    Joined: Mar 14, 2001
    Posts: 19,690

    Roothawg
    Member

    Preach it!

    Also, can you A/Gas or any gas class with no fenders?
     
    Last edited: Jan 13, 2020
  26. Hemi Joel
    Joined: May 4, 2007
    Posts: 821

    Hemi Joel
    Member
    from Minnesota

    Both A/gas and B/gas are required to run fenders.
     
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  27. low budget
    Joined: Nov 15, 2006
    Posts: 5,561

    low budget
    Member
    from Central Ky

    Dont steal your Daughters thunder by bringing that thing to the Wedding....
    Who could concentrate on what was going on with that:cool: sitting out there?:D
     
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  28. It's all about the look rectangular tube vs round. The round tube doesn't look factory or old. They want to keep modern pro chassis out of that class.
     
  29. Roothawg
    Joined: Mar 14, 2001
    Posts: 19,690

    Roothawg
    Member

    Sounds like he'll be buying them back....
     
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  30. exterminator
    Joined: Apr 21, 2006
    Posts: 1,484

    exterminator
    Member

    My grandson's dads truck.36 dodge IMG_0359.jpg
     
    Last edited: Jan 13, 2020

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