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Old 07-23-2012, 08:05 PM
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More Radius Rods Geometry help needed

Hello all-

I've read some of the previous posts regarding proper R-Rod geometry and found it all helpful.

One answer I couldn't find is what rules govern the distance between the points where the rods connect to the frame?

I am building a replica mid-20's Indy Racer (picture a Miller). I am using a Speedway T-bucket frame.

The batwings are 36" apart at the axle. The frame width where the R-rods will mount is 26" wide. The body is 36" wide at the point where the rods will mount to the frame. I want to mount the rods so they are not covered by the body.

In short, the rods would be perpendicular (90 deg.) to the axle.

Will this set up work, or do the rods need to be closer at the connecting points (more triangular)?

The same pretty much applies to the rear axle.

Thanks in advance!!
Marty

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Old 07-24-2012, 12:41 AM
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What you need to watch on the front radius rods is the angularity of the wheels when you turn the car..If the radius rods are at a 90 degree angle to the axle there may not be enough clearance and the tires may hit the rods in a tight turn..

Sam
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Old 07-26-2012, 07:52 PM
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Looks like what you have will work... just mount the rods at the bottom of the frame with a fab'd bracket.

You have to make sure you can adjust the caster angle at the batwings with a clevis...

You may want to consider adding a panhard bar to the front end to eliminate any side to side motion of the front axle... are you using a side steer or cross steer box? The cross steer will give you more side motion.

you'll probably want o use a 30" or longer hairpin...
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Old 07-28-2012, 10:40 AM
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Thanks guys,

I am using cross steer with a Vega box. The rods are 36" Kurtis style hairpins.

The axle I'm using has what looks like a Ford part# and is dropped about 4". Is there anyway to tell if it is a Mor-drop? I picked it up at the Pomona swap meet a few years ago, so it wouldn't be too much of an impossibility.
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Old 07-28-2012, 02:48 PM
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A cross steer axle needs a panhard bar... the action of the cross steer induces movement into the spring shackles and makes a car squirrly...visit the Pete and Jakes website for lots of good info on solid axle front suspensions...

here's some info on MorDrop axles...

another dago axle question? - THE H.A.M.B.
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