The Rodding Roundtable
Motorhead Message Central => Rodder's Roundtable => Topic started by: enjenjo on April 14, 2009, 07:06:54 PM
I have been doing some reading, updating myself on suspension theory. Any one want to give some input on rear bar length? I found some good info here http://home.earthlink.net/~whshope/
I would think you know 'whose" pages those are?
:idea:
No, I don't.
Bill Shope
Ramchargers drag racers were quite successful in the 60's
Bill is a purty good suspension engineer
OK. Seems to know what he is talking about.
It's a good thing Linda is out of town. I'll have to print this so I can sit down and read it. I hope she put ink in the printer.It's been days since I checked this site so I am pleased that there is some subjects appearing here. I wonder if this is a book? GPster
Quote from: "enjenjo"I have been doing some reading, updating myself on suspension theory. Any one want to give some input on rear bar length? I found some good info here http://home.earthlink.net/~whshope/
The available space will limit the maximum length of the bars.
Especially on such a small car.
Adjustable front mounts would allow changes in geometry.
Since this might have a big motor, or a small motor, both the front and rear of the bars will be adjustable. What I am finding says the lower bars should be from 20 to 24 inches, and the upper bars at 70 percent of that. so that's where we'll start.
Quote from: "enjenjo"Since this might have a big motor, or a small motor, both the front and rear of the bars will be adjustable. What I am finding says the lower bars should be from 20 to 24 inches, and the upper bars at 70 percent of that. so that's where we'll start.
I am guessing that 20 - 24 inch measurement is from center to center of the heim joint ?
Quote from: "Crosley"Quote from: "enjenjo"Since this might have a big motor, or a small motor, both the front and rear of the bars will be adjustable. What I am finding says the lower bars should be from 20 to 24 inches, and the upper bars at 70 percent of that. so that's where we'll start.
I am guessing that 20 - 24 inch measurement is from center to center of the heim joint ?
yes. and 24" is preferred to 20"
Are you thinking the bottom bars will be straight front to back paralell with the centerline of the chassis or will they have to angle in from the rear end to find a mounting place on a narrow frame? If they are mounted at very much of an angle then the length of the bars will be longer than the radius that they are arcing in. Don't know how tight those measurements are to a theory but that might make a difference. GPster
The arms will be parallel. Lowers and uppers. I think a watts linkage for side to side control.
so , we are talking a parallel 4 bar set up , than a drag race 4 link set up?
I've been doing some reading on basic drag race 4 link systems.. the length of bars seems to be all over the paper... even the length difference from top to bottom bars.
I am looking at the 1 1/4" diameter bar set up from Chris Alston chassis works for my Morris project. Many seem to use the 1 diameter tubes for direct threading for the hiem joints
No, it will be a drag race setup, parallel side to side, but not top to bottom.
we had a 66 Chevelle drag car in the shop. A Lucas oil sponsored car.
the 4 link bars on it were the 1 inch diameter stuff., direct threaded tubes..
Measured about 23.0 inches from rod eye to rod eye on it.
i took some photos of it too
Cool, post some photos.
I was looking at some back half kits at the swap meet this weekend, I got some ideas.
I'm sure this is far above our spending limit at this time but there has been a guy advertising a new back-half drag/pro-street 4 link set-up in our local Bargin Shopper. It comes with a narrowed 9" reinforced housing with Moser 35 spline axels. He's also got a spool and bearing kit. Adding it all together he's got a price of $2,140.00 but the add has been running for over a month so who knows? He's got an Email address if anybody wants it but I'm uncomfortable even typing an amount that big. GPster
a few photos of 4 link suspension.
clik on them for a larger view
Here is a jpeg of the design that was discussed over the weekend at the Build Day.
Quote from: "Fat Cat"Here is a jpeg of the design that was discussed over the weekend at the Build Day.
Instant center looks a little too high.
8)
For the sake of making the brackets, we used an instant center of 24" high. this can be adjusted in the build.