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Forum: HoseHeads Sprint Car General Forum (go)
Moderators: dirtonly  /  dmantx  /  hosehead


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Topic: 31 inch torsion bars Email this topic to a friend | Subscribe to this TopicReport this Topic to Moderator
Page 1 of 1   of  7 replies
linbob
December 22, 2018 at 02:42:50 PM
Joined: 03/12/2011
Posts: 1649
Reply

what is possible advantage of use of 31 in bar on RR




kossuth
December 22, 2018 at 03:18:33 PM
Joined: 11/02/2013
Posts: 529
Reply
Reply to:
Posted By: linbob on December 22 2018 at 02:42:50 PM

what is possible advantage of use of 31 in bar on RR



I’ve never set one of these cars up but I suspect some folks might use it as a way to get the contact point out more to the left or right on the axle. This would allow a crew chief to offset the axle to the left or right moreso than now. 

Any benefit?  I have no idea. 



dirtracer74
December 22, 2018 at 03:25:01 PM
Joined: 01/29/2007
Posts: 174
Reply

It is about the rate in which the spring responds. The longer a bar is, the slower it will respond. 




Hannity
December 23, 2018 at 09:03:09 AM
Joined: 09/18/2009
Posts: 536
Reply

It widens your spring base, allows you to run straighter rear torsion arms. The straighter arms flex less, increase the spring rate at the wheel, allow you to run softer bars in the rear. 



MoOpenwheel
December 23, 2018 at 02:37:29 PM
Joined: 07/27/2005
Posts: 637
Reply
Reply to:
Posted By: Hannity on December 23 2018 at 09:03:09 AM

It widens your spring base, allows you to run straighter rear torsion arms. The straighter arms flex less, increase the spring rate at the wheel, allow you to run softer bars in the rear. 



So you're saying the longer bar actually results in increased spring rate.  Interesting. 



Jake B.
December 23, 2018 at 03:52:42 PM
Joined: 10/21/2005
Posts: 526
Reply
Reply to:
Posted By: MoOpenwheel on December 23 2018 at 02:37:29 PM

So you're saying the longer bar actually results in increased spring rate.  Interesting. 



For the same thickness of torsion bar the longer bar would have a lower spring rate.  I think what he's saying is that the wheel actually acts like it's a higher rate because there is no (or reduced) loss in leverage due to the twisting of the bent torsion arms that are normally used on the rear of the car.  Basically you're cleaning up the system and allowing it to work more efficiently, which results in better effectivity of the given torsion bar thickness.


Signature here.


MoOpenwheel
December 23, 2018 at 08:15:38 PM
Joined: 07/27/2005
Posts: 637
Reply
Reply to:
Posted By: Jake B. on December 23 2018 at 03:52:42 PM

For the same thickness of torsion bar the longer bar would have a lower spring rate.  I think what he's saying is that the wheel actually acts like it's a higher rate because there is no (or reduced) loss in leverage due to the twisting of the bent torsion arms that are normally used on the rear of the car.  Basically you're cleaning up the system and allowing it to work more efficiently, which results in better effectivity of the given torsion bar thickness.



Yes I understand what he's saying. A longer bar should react a little slower too I think and I'm just trying to digest all the affects together. I'm certainly not an engineer and if it was a definite advantage everyone would be doing it. But it might be something that a particular driver might like the feel of a little better. The never ending search for a couple of tenths. �



MoOpenwheel
December 23, 2018 at 08:17:31 PM
Joined: 07/27/2005
Posts: 637
Reply
Reply to:
Posted By: Jake B. on December 23 2018 at 03:52:42 PM

For the same thickness of torsion bar the longer bar would have a lower spring rate.  I think what he's saying is that the wheel actually acts like it's a higher rate because there is no (or reduced) loss in leverage due to the twisting of the bent torsion arms that are normally used on the rear of the car.  Basically you're cleaning up the system and allowing it to work more efficiently, which results in better effectivity of the given torsion bar thickness.



Yes I understand what he's saying. A longer bar should react a little slower too I think and I'm just trying to digest all the affects together. I'm certainly not an engineer and if it was a definite advantage everyone would be doing it. But it might be something that a particular driver might like the feel of a little better. The never ending search for a couple of tenths. Smile 





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