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Author Topic:   RR SPRING ON TOP
DirtTrackRacingRules 3 8
Dirt Maniac

Total posts: 104
posted November 18, 2005 06:17 PM  
What would putting the rr spring on top of the rear end do for side bite. Had it on the swing-arm?

jeraney
Dirt Roller

Total posts: 9
posted November 20, 2005 11:51 AM  
It would be nice to know what spring placed where on top,behind in front what the pro and cons are for both side. Left side four bar right side swing arm.

Next one would be Four bar Four bar then four bar left right Z. Just want to know why the placement of the spring is in that location instead just put there. I have been watching this post and nobody responded ? Why.

DirtTrackRacingRules 3 8
Dirt Maniac

Total posts: 104
posted November 20, 2005 03:47 PM  
left side 4bar right side swing-arm. Right rear spring on the swing-arm. What would the car do if i put the spring on top of the rear end like the skyrockets and pierce cars?

Has anyone ever heard of this or tryed it????

andykmod
Dirt Freak

Total posts: 369
posted November 20, 2005 05:32 PM  
With the spring on top on the rr it usually frees the car up through the whole corner. It also should make the car alittle more stable on rough racetracks. Just my 2cents \m/

donslink1
Dirt Freak

Total posts: 327
posted November 20, 2005 06:19 PM  
what will it do for side bite, Well I think it will load your wheel better and quicker, when it is on the swingarm, as the chassis lowers during roll so does the front of the swing arm which means the lower spring mount is moving the same direction the chassis is.
that is one reason you have to run a stiffer spring on a swing arm.
also with it on the top of the rearend your spring table is a lot higher.

Kromulous
Dirt Forum Champ
Total posts: 816
posted November 21, 2005 08:05 AM  
I'm with Andy, 4 bar - Z-link cars tend to be tight all over, spring on housing free's it up a tad, all over.

The reason you run a stiffer spring on a swing arm is because the suspension has alot more leverage over the spring.

Krom.

donslink1
Dirt Freak

Total posts: 327
posted November 21, 2005 03:05 PM  
that is another reason, I had in my statement that that was one of the reasons.
everyone know there is more leverage on the spring with a swing arm, but alot of people dont realize the other reason I posted. It all has an effect.
also after reading my last post it sounds like I said it loads the wheel better and quicker with a swingarm.
I was saying it would load it better and quicker on top of the rearend after I said that I just started going in about the swingarm, Just explaining myself alittle, Im with you guys!!!!!

Kromulous
Dirt Forum Champ
Total posts: 816
posted November 21, 2005 04:24 PM  
I was thinking the same thing Don, got to re-reading your other post and realized what you were saying.

Spring on housing should be a true-er, or more linear compression of the spring. It should gain rate faster as well.

Never run a spring on housing before.

Krom.

washeduptoo
Dirt Maniac

Total posts: 165
posted November 22, 2005 08:12 AM  
We have run the swing arm and spring on top for the z-link. The driver liked the on top a lot more. With the swing arm we fought with lack of side bite, on top we able to get better side bite. But, when we ran the swing arm, our knowledge of the z-link wasn't that great, but since, we have learned a great deal more about z-link adjustments. It could have been that we were the problem with the swing arm.

driver27
Dirt Maniac

Total posts: 196
posted November 22, 2005 01:39 PM  
I would love to see some pics of how you folks mount the spring on top, for some reason i cant get my mind around the mounting of the spring. Never seen one around here. Any pics greatly arreciated.

washeduptoo
Dirt Maniac

Total posts: 165
posted November 22, 2005 01:53 PM  
Ours is nothing more than a clamp bracket with a spring perch attached to it on the rear end and a clamp bracket on the frame with a thru bolt with spring can on top. Sorry I don't have any way to post pixs. But I'm sure afco or some else sells them. Do you mind me asking what rr suspension are you going to be running?

[This message has been edited by washeduptoo (edited November 22, 2005).]

[This message has been edited by washeduptoo (edited November 22, 2005).]

driver27
Dirt Maniac

Total posts: 196
posted November 22, 2005 02:17 PM  
for me, im thinking about a spring behind 4 bar on left and a z-link on the rr, with spring on top. Gotta do some measuring to see if I can get a jackbolt arrangement in there and with enough space.still love to see some pics tho.

andykmod
Dirt Freak

Total posts: 369
posted November 22, 2005 03:44 PM  

 
Here ya go. This is a Kraft Kar rr spring on top.

GRTWallbanger
Dirt Maniac

Total posts: 199
posted November 23, 2005 06:02 PM  
Hey Andy? Is that your new car?
A Kraft car?I have only seen a few but they sure are sweet.

andykmod
Dirt Freak

Total posts: 369
posted November 23, 2005 08:05 PM  
No, I bought a Harris car.

spde
Dirt Freak

Total posts: 246
posted November 24, 2005 02:29 AM  
There are more things than just being on top of the housing. Is the spring on a birdcage? Is it locked or floating? Just another few things to consider. ltr

20crew
Dirt Roller

Total posts: 20
posted November 24, 2005 07:08 PM  
spde, on our Skyrocket the rr spring is locked on top. it would be difficult to put it on the birdcage because of the birdcage indexing.

[This message has been edited by 20crew (edited November 24, 2005).]

Sidebite252
Dirt Forum Racer

Total posts: 100
posted November 24, 2005 07:28 PM  
I did this - was a swing arm car & I moved the springs (on both sides) on top of the rear end housing & just ran 15" arms (2 link). I went from 275's on both swing arms to a 175 LR & 150 RR. In my case - my car seemed to roll over a bit better and I did get slight more sidebite. I'm still struggling with forward bite on dry slick tracks but the car is quicker through the turns on a slick track. This was an old Hoover chassis built in about 1996. Good luck. When I get my digital camera back from the shop I'll post some photos of how I made the swap. Maybe it will give you an idea of how you may want to do yours.

[This message has been edited by Sidebite252 (edited November 24, 2005).]

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