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Author Topic:   Torsion Physics
dbradley
Dirt Freak

Total posts: 251
posted November 09, 2004 02:20 PM  
Hey all...
This is all new to us...
Please give the low down on how this works...I get the general concept...but don't understand where the adjustability is...Tell me what happens when you change holes on the bar and on the cage....

bill9j
Dirt Full Roller

Total posts: 35
posted November 10, 2004 06:18 PM  
your adjustment comes by adjusting the torsion stop there located in the middle of the car by the torsion tubes and as the same as the coil car the cross pattern is still in effect what ever you do to one conrer effectes the opposite

racerwilson
Dirt Freak

Total posts: 357
posted November 13, 2004 04:32 PM  
ok that partly you will also have the roller at the birdcage to move fwd or back and that will chane the spring rate of that bar. The shorter the bar the stiffer it is. Longer bar will be come softer.

bill9j
Dirt Full Roller

Total posts: 35
posted November 13, 2004 05:38 PM  
racerwilson as they say you learn something new everyday how much of a rate change does moving that create any idea

racerwilson
Dirt Freak

Total posts: 357
posted November 13, 2004 08:37 PM  
aprox. 1" will act as next bar. Lets say you have a .900 bar with a 15" arm ( center of roller to center of bar) and you shorten it to 14" you will change your effective rate from a .900 to a .925 There is a calculation to figure out what your sping rate is. We run a .900 @ 15" on rr and a .950 @ 17" on lr
give you about 146 lb spring rate with alot of travel.

bill9j
Dirt Full Roller

Total posts: 35
posted November 14, 2004 05:54 PM  
thanks for the info good to know lot easier to change an arm at the track then a bar

bill9j
Dirt Full Roller

Total posts: 35
posted November 14, 2004 05:58 PM  
how do you do the spring rate calculation

racerwilson
Dirt Freak

Total posts: 357
posted November 15, 2004 07:28 AM  
when I dig it out I'll give it to you.

racerwilson
Dirt Freak

Total posts: 357
posted November 23, 2004 11:11 AM  
go to www.proshocks.com in left side bar go int to calculators then torsion bar rates. punch in your bar dia. arm length and effective bar length radious to radius. Most common is 23" or 24". give that a try.

bill9j
Dirt Full Roller

Total posts: 35
posted November 23, 2004 12:31 PM  
thanks again for the info

dbradley
Dirt Freak

Total posts: 251
posted November 25, 2004 03:37 PM  
I was talking with the guys at Bicknell...And they pretty much said that all we need to switch between our tracks is a round of wedge.....The problem is I can't figure out jus yet what that would entail on the rear....Was mighty easy with the coil over

dbradley
Dirt Freak

Total posts: 251
posted November 25, 2004 03:42 PM  
WHere do you think we should start with this thing first...We need to buy birdcages anyway...should we buy the fixed cages they are recommending or buy something else..
thanx
D

bill9j
Dirt Full Roller

Total posts: 35
posted November 25, 2004 07:00 PM  
i personally would go with what they said at bicknells use the fixed birdcages, and useally we just put a turn or 2 in or take a turn or 2 out of the right front for our track switches either to tighing it up or loosen it up

[This message has been edited by bill9j (edited November 25, 2004).]

racerwilson
Dirt Freak

Total posts: 357
posted November 26, 2004 07:38 AM  
Go with the stock Bicknell cages. Talk to Randy at Bicknell he will be able to give you a good starting setup for your track. Ask for a set up sheet for your chassis, it should have a ser# in the 2x4 just give that to him.

dbradley
Dirt Freak

Total posts: 251
posted November 27, 2004 05:30 PM  
Thanks Racer,
Talked with Randy and he is a great help have all the set up stuff and a parts pull list for the car....The company is so much more supportive as compared to Troyer...It took us 2 months to get a coil set up from Troyer...Randy sent us out a huge packet of info next day...I wasn't sure if you were talking a different birdcage when you were talking about roller adjustment...Explain as well how the torsion stop works..Is it just a limiter of upward movement on the torsion bar.

racerwilson
Dirt Freak

Total posts: 357
posted November 27, 2004 08:18 PM  
Bicknell's rear cage may only have one setting for the rollers. I have four on my Teo set up. It is set up so you can run a high chassis hight and still level out you arms by moving to the upper holes.
was just at Teo's shop Friday and they are goung full tilt.

Roby
Dirt Roller

Total posts: 5
posted December 21, 2004 04:39 PM  
what is a good basic set up for a bicknell, to run in a big block modified.
At ocfs or rolling wheels.

dbradley
Dirt Freak

Total posts: 251
posted December 21, 2004 05:49 PM  
Roby,,,here is the setup from the companies mouth racer will help us tweek it hopefully
Frame height Spring Torsion Bar Shock Air
LF 5" 12"250 BIL162/55 9
RF 5 1/2" 12"175 BIL162/55 9
LR 5 1/2" 950 rear hole BIL208/72 6
RR 6" 900 rear hole BIL208/72 10

mikee
Dirt Roller

Total posts: 12
posted December 21, 2004 06:44 PM  
quote:
Originally posted by racerwilson:
Bicknell's rear cage may only have one setting for the rollers. I have four on my Teo set up. It is set up so you can run a high chassis hight and still level out you arms by moving to the upper holes.
was just at Teo's shop Friday and they are goung full tilt.


They better be going full tilt! My car is due in a few weeks

Roby
Dirt Roller

Total posts: 5
posted December 22, 2004 10:43 AM  
Thanks for the help,does the setup change that much if it is a low rack car.

racerwilson
Dirt Freak

Total posts: 357
posted December 22, 2004 03:48 PM  
It may. What chassis are you running, and at what track. That may change some things.

dbradley
Dirt Freak

Total posts: 251
posted December 22, 2004 04:39 PM  
Racer, the new bicknell birdcages are adjustable as well...I like the thoughts of small adjustments like that instead of changing the bar...Can you explain what a change in a round of wedge intails...Is it only a matter of
adjustment in the torsion stops in or out as well as the front springs?

racerwilson
Dirt Freak

Total posts: 357
posted December 22, 2004 08:15 PM  
it's the same basic adjustment.

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