MYSTERIES of Hot Rod Rear Suspension REVEALED!!! Radius Rods? Ladder Bars? Hair Pins?
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- čas přidán 26. 09. 2022
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Alright Gang... rear radius rods, hair pins, ladder bars... whatever you wanna call them is the subject of great debate... Especially when it comes to hot rods... boy howdy. lets dive in... see if we can figure this out - Auta a dopravní prostředky
Best explanation about the subject, showing facts and doubts about the entire rear end system! Congratulations!!
Thank you that's the best Explanation I've found..I'm no fabricator..and I'm building me and my misses a trike..was going to use a monoleaf spring on it and you're video has helped me understand about the radius arms so well...thank you and have subscribed..
thanks a lot for subscribing that really helps me back. I am glad it helps. its a lot to take in... but once you get it I am sure youll be able to make your suspension work
Thanks.really am thick as a plank lol..but really understood what's involved in this style of set up..thanks again.learnt so much
Great job! I recently bought an old rod that has problems in this area. Really helps me understand this type suspension. Thanks alot.
Glad it helped. Thank for taking the time. The rear end has lots of different forces acting on it … but once you grasp it you’ll be able to sort out what’s causing your problems
They"re not speed holes. They are called lightening holes or swiss cheese holes. Parts swiss cheese PROPERLY also help strengthen the part. Swiss cheesing was developed during WW11, for the aircraft industry
The lights are on, and somebody's home, cool.
Ha thanks man
Awesome video broder
thanks for always watchin I appreciate it
Did you check to see if the hairpins were the same length? I've run into identical pieces that weren't. Also springs settled with use. I've always struggled with how simulate that when setting up suspensions.
That’s interesting. I do my initial set up by laying them on top of each other. But that’s for sure something to look out for
Excellent job your doing
Thank you
Front hairpins used on the back?? You need to start over.
Dang… I ll get right on it
Are the hairpins all that you’re using? Any concern that you might need a torque arm or panhard bar? As you know there is no end of internet hot rodders with opinions on this… it’s a lot to digest. I’m using 37-40 rear radius rods so I’m thinking I may need some kind of torque arm even with a mild flathead.
That’s the plan. Fair question though
As far as the torque arm
With the hairpin mounted to the top and bottom on the axle tube. The top is in extension during acceleration( axle trying to roll up) and the bottom is in compression. The top functions much like a torque arm in this case … and it’s not gonna stretch.
The stiffener creates a mini truss to resist bending/yield.
And you’re a particular case AJ I would run at torque arm with the spring over axle and 40 radius rods. But The radius rods were just not meant to have that type of force applied and they will bend a bit under hard acceleration. That said I don’t think you could break them (from accelerating)unless you were routinely drag racing or something like that. And odds are something else would give it up first. I think your set up will work just fine. And a torque arm is cheap insurance
As for the pan hard bar. I have never had an issue in a light car with a transverse spring. It’s certainly not a bad idea if you set it up right. For anyone reading the goal of the pan hard bar is to keep the axle centered with the frame and body(right to left ) . And in my experience the leaf spring does that just fine on its own in a street car model a or t.
I guess I will do a video on the mercury pan hard bar because the travel on those coil springs is dramatic. It had one factory and needs on for sure with the new suspension
@@betweenthesharksgarage Thanks for the expanded thought process. I already decided my 40 rods need some backup but I’ve been struggling with the “how much” part and “the look”. I know a simple tube w/ heim joints would be easy and strong but they look out of place on a vintage style build (in my opinion) so I’ve been thinking out a more period looking solution using vintage parts. I’ve been wondering if it will be strong enough though… I know a lot of people run 40 bones by themselves and combined with your comment I now think my idea will be fine. Hopefully I’ll have a video on it by the end of the year. Thanks again!
@@AJStarch Hey man I have had my head in this problem for a while. You may not need as much as you think. First off any kind of torque arm that is mounted to the upper half of the axle will be in tension when you accelerate. meaning the axle will be trying to spin up as the wheels spin down trying to pull/stretch whatever you use as a torque arm, testing its tensile strength . The tensile strength of a standard 1/4" bolt (grade 2) is 75,000 psi. That will not be the first thing to break for sure. Plus, the torque arm mostly helps deal with the shock force that has to brake the friction of the tires on the pavement, once the car is rolling the force for the axle to spin upward decreases significantly. I think the biggest thing is getting the geometry right so that nothing ends up binding. I think that means that... when viewed from the side.... the torque arm and the radius rods pivot off the same point and thus share the same radius in profile. Otherwise I would imagine the rear end would have two pivot points forcing the rear end to try to move in two different arcs.... i think... or perhaps just weld the front of the torque arm to the front of one of your radius rods and let them share that pivot...sorta making a hairpin