Jim Lusk
Well-Known Member
Then, if it's not diving the shocks are preventing it...
IMO, getting good info out here is what is important. Regardless of what any book says, be prepared to work with facts and laws of physics. The stored energy in any loaded spring is directly proportional to the weight put on it. If the weight is the same, the stored energy is the same. Lemme know if this does not make sense or what the issue is here. Or is the issue with the working with the 90/10 type of shocks? Again, asking not arguing; I am open to learn, RRR. Let us know what the book syas on this matter.Originally Posted by nm9stheham Actually there is no extra energy stored vs a thicker bar; stored energy is the same for both. The large upward motion from the /6 bar is caused by it having to untwist more to release the same amount of energy. The lighter bar also works better with a low rebound rate shock. Stupidest thing I ever read. Want the facts? Read the Mopar Suspension manual.
Stupidest thing I ever read. Want the facts? Read the Mopar Suspension manual.
AdWell this has all been of great benefit to me. I had something better to think about than "Will the novacaine work?" while the dentist was drilling out two holes in my teeth this afternoon. Some more thinking while there also prompted me to go back to the books, and I found I was flat out wrong.
The energy stored in a spring is 1/2*k*x^2, where k is the spring constant, and x is the distance moved or (angle moved in the case of a T-bar). So if you cut the spring rate in half and the motion doubles as a result to hold the same weight, there is a net doubling of stored energy. (It is not intuitive, but it all works that waysince the energy stored is an integral of force over distance. THAT part I understand.)
So my apologies to whitepunkonitro, and my further thanks (in an odd way) to RRR for kicking me in the a** over it!
'splains better why the /6 springs are good for getting the front up in the air when launching.
I think if the car needed .920 bars Chrysler engineers would of installed them from factory?
40 years ago they didn't know any better. they handled great for the time.. its now 2014 and there are far better choices out there over 9" drums and slant six bars.
again.. if its a drag car then yes put 6cyl bars in it.. a street car that only sees 45mph arounds town sure you can get away with 6cyl bars. but if you really like driving the car.. take multi hour trips on the highway and stuff like that you will want bigger bars... the drive will be light years more enjoyable..
I don't think it was so much not knowing any better, it was the expectation of the customer as well the available shocks and tires. HP Mopars got better suspension than the low perf ones, for a reason.
I would agree - it had nothing to do with "knowing better". Citroen used torsion bars and unibody construction in the 30s. Chrysler introduced them in the late 50s. So it had to do with the consumer at the time who had coils sprung full-frame GMs and Fords to choose from and the torsion bar suspension was a far better, lighter, and responsive setup. Compare that to a FWD platform from the 80s that could out-handle and out-brake even the best factory torsion bar setups. Then compare the 80s FWD to a 2015 vehicle. Even the base models of anybody can handle and stop well. My GF's Santa Fe has a front sway bar larger than I can even buy for any of my Mopars and it's got progressive springs and struts that are all improvements over the old stuff. That's what the modern car freak drives every day. Jumping from something modern to a 50 year old car comes with some acceptance that they are nothing alike in capability.
OK everyone, nevermind what I'm telling you and listen to the other guys. Even though I did it and am not experiencing super dangerous handling and ride, because these "experts" said so you must put bigger bars in your big block A bodies, you must do what they say. Follow the sheep my friends.
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I'm not actually getting a whole lot of front end rise on launch. Go to my YouTube channel and see the videos. The channel uses the same name I use on here, Doosterfy. Regardless of the amount of rise at launch, the car does not spin at all, the tires are glued to the track. It's by far the best car I have ever drag raced.