Drag Racing Discussions > Front Engine Dragsters

A arm vs straight axle.

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H.G. Wells:
I could use some advice. Starting a new build and planned to re use my torsion bar and axle from my old bent car. Well, as I am pulling parts from the old car before we start to lay out the new pipe I see that my axle is a little bent. If I cut my torsion bar off and clean it up and to re-weld to new car I think it would be ok. Probably. If I have to buy new axle, spindles/torsion bar/radius bars etc it will add a lot of $$ to the build too.

Old car was original 1969/70 and was very flexible. (to its detriment) I actually welded the torsion bar arms so it would not bounce as much.
New chassis will be much stiffer so I had hoped to use a front suspension and to keep the nostalgia look.

Builder has a jig for the A arms and will go either way I decide.

What are the advantages and disadvantages of an A arm?   

rooman:
What happened to the spindles etc off the old car?  I personally don't like A arms on nostalgia cars from a visual point of view. Most of my cars run a rigid mounted dropped axle but Glen opted for a torsion bar on his, again for the "look".

Roo

dreracecar:
A torsion is not needed because the rear tire design does most of the work towards weight transfer during squat and not from front end rise.
 A-arms give more room in that area between the frame rails and are so much simpler to construct and incorperate offset. And those of us that can build an axle (straight & offset) are a small club, and that sets the car apart from the rest of the super comp dragsters out there.
Handleing wise, the front end does not know any different

H.G. Wells:
This is the info I am looking for. Roo, the old spindles are fine and could be re-used. I do remember having to turn the bushings since the kingpins did not seem to be any standard size.  The drive-ability difference is really my big question.  I had thought about having a new axle built with my spindles and bolting it directly to the frame. And the nostalgia look is a big deal for me. The drivers compartment is not tall, it will be a 5pt cage and will build a body that is more curve and less break.

From a weight standpoint what is the lightest?

rooman:
"From a weight standpoint what is the lightest?"

   A welded on A arm package will weigh a little less but a bolt on with tabs and hardware would probably be pretty close to a dropped axle. The difference would be insignificant, especially is there is the possibility that you would have to add weight to the nose anyway to tune the chassis.
  As for driveability there should be no difference if each is built right.

Roo

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