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Author Topic:   Swing Arm Opinions and help
Sidebite252
Member
posted July 12, 2003 03:59 PM
Ok guys, I run short swing arms 16" centers. brackets on both side have 3 holes and both swing arms in the lower is no good - no bite. Both arms in the middle is very good throught the corners but still lacks on forward bite. Both arms in the upper holes give good forward bite but not as fast in the turns. What happens if I run LR in the upper hole and RR in the middle? I've been told if I skew these arms the car will not handle? Any suggestions? The chassis is a Hoover and the pull bar has a "poor boy" progressive spring (double spring front and back of the pull). Would really like some input from anyone who has short swing arm experience.

Randy

mod27
Member
posted July 12, 2003 04:38 PM
we have a swing arm car this year.
I have been running mine like this:
Left side in top hole and right side in bottom hole,
Each side has 3 hole bracket.
Car has good forward bite, i was lacking on side bite, but we have solved that problem with softer springs up front. The only thing i notice is car tails out a little more than i would like it too. After tonight, we are going to try both sides in top hole, Hopefully this will help us. Other than that the car works great and is fast in the corners.
Hope this helps you


Sidebite252
Member
posted July 14, 2003 04:49 PM
What we found with the swing arms all the way up and the torque arm all the way down on a heavy track was major wheel bounce. I moved the torque arm to the middle hole (5 holes in torque arm bracket) and this eleminated the problem. Have you tried the LR up and the RR in the middle? This is what I'm considering.

[This message has been edited by Sidebite252 (edited July 15, 2003).]

hm
Member
posted July 15, 2003 09:20 AM
Are you adjusting your swing arms or the trailing arms? You should not be adjusting the swings at the track if you have trailing arm adjustment. Moving the swingarm up is compressing the spring (changing wedge and ride height) moving the swing down is doing the opposite. We never move the swings, all of your adjustment should be with the trailing arms.


Sidebite252
Member
posted July 15, 2003 12:51 PM
No trailing arms - just swing arms (no z-link) - we never adjust position of the swing arms at the track. We only do that on the scales - what ever we bring to the track as far as swing arm position, we run. Only adjustments we make at the track is the torque arm position and maybe the panhard if needed. Just looking for information and help on skewing these swing arms - I'm going to try it but would like some opinions.

Thanks

Sidebite252
Member
posted July 16, 2003 11:28 AM
A lot of lookers and no suggestions. None of you guys got any thoughts on this? No "Golden" set up with these short swing arms? Thanks for the replys I have received.


24mod
Member
posted July 16, 2003 03:04 PM
Im guessing this is a clamped 2-link swingarm. First off spring rate are critical on these cars as the promote forward bite and lack in side bite. I run 250's in the rear on a 13in left side and 16in right, both in the upper holes. Swing arm mounts are in hole nearest to rearend. Have tried right side in bottom hole and the forward bite I gave up seemed to outweigh the sidebite pickedup so I prefer them in the top holes. I also run a solid pull bar and a short stick on the pinion. NOTE - the left side was shortened with a bracket and has more angle than the right.


zeroracing
Member
posted July 22, 2003 10:23 PM
How much more left rear weight over right rear weight are you running (bite)? We run around 70 to 90 lbs more on the left rear than the right.


mod27
Member
posted July 23, 2003 09:01 PM
with car on scales, and setting it up like it would be at end of feature, we try and shoot for 150 lbs left rear bite.
I've played from 100 to 300 so far, just depends on track and drivng style.
We just try different things and make notes on how it works.


zeroracing
Member
posted July 23, 2003 10:25 PM
Something I discovered early this year playing with springs - I was running 275 on both rear swing arms and setting my ride highths I was only getting about 70lbs of bite - Now we've dropped the RR to a 250 and I'm getting around 90 to 100 with the same ride heights. I do like the way the cars rolls over better with the 250 on the rr but that's on a 1/4 high bank track - on a 1/2 high bank the car is faster through the middle of the turn with the 275's on both. I hope to play with this skew set up in a couple of weeks (guys got to work so he can pay for this fun, aye???)


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