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Old 02-17-2008, 06:49 AM
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4 link rear suspension

I am building a 31 model A which will be mostly street driven but will see some 1/4 mile action.I would like to use 4 link in the rear and would like to know where is the best place to get it. Also what are the pros and cons of solid VS urethane bushed ends. Would air bags give good traction or are coil overs the only way to go?Is there an optimum length ? I would like them as short as possible with out giving up traction.I will be using a SBC with about 400 to 450 HP and a 700R4 with a 9" rear. Rear tires will be 29X12.50 and a 3.50 or 3.73 gear and posi.
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Old 02-17-2008, 06:58 AM
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this may help

http://home.earthlink.net/~whshope/

good reference pages for rear suspension..

Urethane bushed ends are a bit quieter and may last a bit better on a street rig..Coil overs will give you a bit better hit on launch than airbags..airbags are comfy rides tho..There are lots of compromises in suspension design..

Your bars only need to be about a foot long..longer bars give you more suspension travel which can make for a more comfy ride..and a lot depends on final ride height as well..

Good luck..

Sam
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Old 02-17-2008, 08:11 AM
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I used Pete and Jakes four bars on the front and the rear of my 30 coupe.
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Old 02-17-2008, 08:26 AM
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Thanks Henry, I have 4 bar on the front but am looking for a more performance type rear . Thats why I want the 4 link instead of the 4 bar.Thanks One More Time,I have not read it all yet but it is a help.
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Old 02-17-2008, 09:00 AM
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I buy my bars from these people,They are very well built.


http://www.suicidedoors.com/4LinkParts.php
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Old 02-17-2008, 05:08 PM
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Quote:
Originally Posted by NEW INTERIORS
I buy my bars from these people,They are very well built.


http://www.suicidedoors.com/4LinkParts.php
Me too. Very solid pieces for a very reasonable price.
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Old 02-17-2008, 08:09 PM
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Yes ,but I want 4 link not 4 bar. Thanks anyway.
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Old 02-17-2008, 08:25 PM
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You can still have a four link.I'm just suggesting to use the bar's, In set it up as a four link.
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Old 02-17-2008, 09:03 PM
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You can use the bars from the cheap guys and build your own front brackets.


Chris Alston chassisworks, Art Morrison and Jim Meyer racing all sell 4 link kits.

Later, mikey
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Old 02-18-2008, 02:00 PM
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I ran a pete and jakes triangulated 4 link setup in my 30 model a roadster with a 355cid blown sbc and a 9in. 4:11 positraction for 13 years, it hooked like all getout, I had the pete and jake viper gas charged coilovers. the short wheelbase rode choppy with the coilover shocks, but I ran a 13.00 1/4 mile at Quaker city on a routine basis with m+h racemaster slicks! the downside is the triangulated 4 link is a bear to run exhaust around, and I ran urethane bushings.I would'nt run solid rod ends on the street!
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Old 02-19-2008, 06:54 AM
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Quote:
Originally Posted by streetrodderbn
I ran a pete and jakes triangulated 4 link setup in my 30 model a roadster with a 355cid blown sbc and a 9in. 4:11 positraction for 13 years, it hooked like all getout, I had the pete and jake viper gas charged coilovers. the short wheelbase rode choppy with the coilover shocks, but I ran a 13.00 1/4 mile at Quaker city on a routine basis with m+h racemaster slicks! the downside is the triangulated 4 link is a bear to run exhaust around, and I ran urethane bushings.I would'nt run solid rod ends on the street!
Please correct me if I am wrong.I was always told that the fixed bars are called 4 bar and the adjustable ones(as in adjusting the location of the ends up and down)were called 4 link. Thanks to all for your help.Now if somebody could tell me about the good or bad regarding coilovers VS airbags as it pertains to traction I would appreciate it very much.Basically I want a pro street eurathane bushed 4 link with air bags,Or do I ?Also no insult meant but isn't 13.00 in the 1/4 mile slow for a blown model A ?
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Old 02-19-2008, 07:59 AM
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Quote:
Originally Posted by speedydeedy
Please correct me if I am wrong.I was always told that the fixed bars are called 4 bar and the adjustable ones(as in adjusting the location of the ends up and down)were called 4 link. Thanks to all for your help.Now if somebody could tell me about the good or bad regarding coilovers VS airbags as it pertains to traction I would appreciate it very much.Basically I want a pro street eurathane bushed 4 link with air bags,Or do I ?Also noA ? insult meant but isn't 13.00 in the 1/4 mile slow for a blown model
Triangulated four bar setups can be adjusted both horizontally and to length, or can be non adjustable, my street roadster was a true street driven car that I swapped on 7 in.slicks to fit under stock fenders, no rollbar. the reason I ran 13.00 was that I could run that time all day long with =/-.03 consistency and the engine never needed to be torn down to rebuild between rounds, yes it could go much faster, but, this car was a dual purpose streetrod that I routinely drove from n.e.,Ohio to western Maryland and beyond for shows! Thus-I did'nt want to beat on it! You seem to be trying to build a drag car,that is a whole different type of build!
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Old 02-19-2008, 08:53 AM
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streetrodderbn,I understand about your car,I thought it had more capability with that set up. In your first post you called your rear suspension triangulated 4 link then you called it 4 bar.I'm not trying to be an a#@hole just make a point as to the difference between the 2. I understand that there is a certain amount of adjustability in 4 bar but 4 link is infinitely adjustable. I am building a street car that will see some track time and was told that 4 link adjusted properly would give me the best traction and driveability at the track but would ride and drive just like 4 bar on the street. So I am looking for the best of both if possible and since I don't have first hand knowledge I am hoping for input from someone that does.I intend on running about 400HP but want the suspension to be ready to handle more if I choose to up it later or if I sell it and the new owner wants more HP he won't have to redo the frame.I would appreciate any input from you or anybody else.
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Old 02-19-2008, 09:19 AM
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Typically what is called a 4 bar is a set of parrallel bars, with the only adjustments in geometry being done at installation.

My understanding is that the dynamic effects on traction are somewhat neutral, although you can get a better hookup by angling the bars up. Billyshopes webpage has several calculators that will tell you how much antisquat you can gain by doing the angle calculations and setting up your car using them.

A four link however, although not infinitely adjustable, can be adjusted for the best hookup and traction after the car is built. The position of the links determine how much anti squat you get . Keep in mind that as you increase anti squat upon acceleration, you lose some in braking....the same dynamic forces that plant the wheels, work in reverse to lift them as you brake.

My understanding of an airbag vs a spring is that the rate is dependant on the installed height, bag diameter, and pressure and because the rate is progressive, finding the balance between too soft and too stiff means playing around with pressures and installed height.

Not too much different than setting up coilovers really.

There is a member here named tony@airridetech he could shed way more light on this than me.

He hasn't been here for a while , but air ride technologies has a forum..
http://www.ridetech.com/forum/


I went over there and saw a few threads about drag racing with airbags. Perhaps a call to air ride while viewing their website would do some good.

Later, mikey
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Old 02-19-2008, 10:09 AM
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Thanks Mikey,Thats the part I was trying to clear up. About the difference between 4 bar and 4 link. I also understand about the brake thing,but isn't most of the braking done with the front discs therefore the braking lost would be minimal especially on a rather light car?
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