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Author Topic:   spring on 4bar
DirtTrackRacingRules 3 8
Dirt Maniac

Total posts: 101
posted August 03, 2004 05:13 PM  
On the left rear with a 4bar where is the spring located in front or behind and what chassis do you run?

Thanks in advance.

Chad
Dirt Freak

Total posts: 269
posted August 03, 2004 05:45 PM  
Typically, you run the spring behing the rearend mounted to the birdcage. But, if the track is very slick, and a stop and go paper clip configuration, some run it in front of the rearend mounted solidly to the axle (like a 2 or 3 link). This setup adds crossweight to the chassis as the pinion moves upward. I run a DW8 all 4-bar car.

NJantz
Dirt Forum Champ
Total posts: 755
posted August 04, 2004 06:31 AM  
On a dry slick, people will also run the spring behind the axle on the birdcage to seek the benefits of indexing.

[This message has been edited by NJantz (edited August 04, 2004).]

zeroracing
Dirt Forum Champ
Total posts: 1875
posted August 04, 2004 11:36 AM  
here is my take and why.
clamped up- this is the spring mounted in front but solidly to the axle tube not the birdcage. run this on tacky short tracks, great forward bite on mud and rough. but the car may run out of bite on down the stretch, also car may become too tight on dryslick. another point is the car will unload the lr very hard when you get out of the gas.
spring behind- this is on the birdcage, good for most all tracks, great for dryslick, good on momentum tracks, but can work fine on about anything. car is not as easyliy upset as it is when clamped up, and the car will not unload the lr on entry as bad. also car must stay hiked up in order to get most bite.

long story short.
stop and go tacky-spring in front
momentum long tracks-spring behind.


DirtTrackRacingRules 3 8
Dirt Maniac

Total posts: 101
posted August 04, 2004 04:45 PM  
thanks for the replys. More would be nice, i was just wondering which is an all around setup for a traveling car cause i see the usmts guys are running them in front.

dirtbuster
Dirt Forum Champ
Total posts: 2007
posted August 04, 2004 04:59 PM  
I am trying to figure out the differences/benefits/drawbacks, whatever between the 2 as well. Look at guys like Shyrock with the spring clamped in front but yet you dont see a lot of late models that way. Most of the super lates and quite a few mods around here have the spring behind on the BC. I think, like most, things both can work its jsut finding the right combination.

DirtTrackRacingRules 3 8
Dirt Maniac

Total posts: 101
posted August 04, 2004 06:34 PM  
how do you clamp the spring on the lr

DirtTrackRacingRules 3 8
Dirt Maniac

Total posts: 101
posted August 07, 2004 01:42 PM  
do u just clamp the spring?

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