Reverse 4 bar RR is it legal?

[a25rjr]

Has a lift arm so it kinda has to be floating right?
Something has to be giving...

Not really. It was common many years ago to lock the lr down. Made a ton of forward bite!

[MLR19]

I think you are talking about clamping the LR shock to the axle tube, not locking the birdcage.
I have seen the LR birdcage locked, & the upper bar removed on a swingarm car, (basically 3 link ) it was really fast in the right track conditions.

[a25rjr]

I think you are talking about clamping the LR shock to the axle tube, not locking the birdcage.
I have seen the LR birdcage locked, & the upper bar removed on a swingarm car, (basically 3 link ) it was really fast in the right track conditions.

No, Im talking about locking the birdcage to the axle. Pretty common a few years ago.

Put 150lbs of bite with it and have tons of forward bite!

[MasterSbilt_Racer]

No, Im talking about locking the birdcage to the axle. Pretty common a few years ago.

Put 150lbs of bite with it and have tons of forward bite!

If the birdcage can't rotate, the wheel cannot move vertically?

[MLR19]

Locking the birdcage & leaving both 4 bars connected would result in a rigid arrangement, any movement would be from something flexing or bending. Clamping the shock bracket to the tube with shock & spring in front but floating birdcage was very popular at one time.

[a25rjr]

Look at some of the earlier TWM birdcages. They had a built in clamp bracket to lock down the birdcage. I believe GRT was the first to use them.

[MasterSbilt_Racer]

Look at some of the earlier TWM birdcages. They had a built in clamp bracket to lock down the birdcage. I believe GRT was the first to use them.

I remember the bracket. You took a bolt out that connected the shock bracket to the cage. You then put the bolt thru the clamp bracket and the shock mount.

To lock the cage, the top and bottom of the cage would have to connect to the same point on the chassis. Otherwise there would be zero degrees of freedom in the system. Or, you would have to remove a link. (3 link type deal)

[a25rjr]

In the mid to late 90's, the top grt teams, were running the clamp bracket with a long bolt through the lower trailing arm mount, on the birdcage. The birdcages were 1 piece twms, so essentially the cage was locked down. This was before the lr behind setup, and grt found this really increaded drive at the super-slick tracks, like Dixie!

[billetbirdcage]

In the mid to late 90's, the top grt teams, were running the clamp bracket with a long bolt through the lower trailing arm mount, on the birdcage. The birdcages were 1 piece twms, so essentially the cage was locked down. This was before the lr behind setup, and grt found this really increaded drive at the super-slick tracks, like Dixie!

What your talking about had the spring clamped to the axle not the entire cage, the cage still rotated on the axle.

If you watch the video, the spring doesn't seem clamped to the axle as I don't see any indexing upon throttle or deceleration out of the spring. I'm certain it isn't locked (cage or spring), watch at 47 seconds noting the torque arm link that lowers when off the gas. If it was locked you'd see the cage rotate downward in front with the axle rotation and I see no sign of that at all. The way the bars are set, there would be very little indexing so probably just can't see it moving that slight amount.

[a25rjr]

What your talking about had the spring clamped to the axle not the entire cage, the cage still rotated on the axle.

If you watch the video, the spring doesn't seem clamped to the axle as I don't see any indexing upon throttle or deceleration out of the spring. I'm certain it isn't locked (cage or spring), watch at 47 seconds noting the torque arm link that lowers when off the gas. If it was locked you'd see the cage rotate downward in front with the axle rotation and I see no sign of that at all. The way the bars are set, there would be very little indexing so probably just can't see it moving that slight amount.

No billet, we copied what Frye had. The hardest part was finding a long 5/8 bolt to hook the clamp bracket to the 1 piece birdcage. Since this was the latest/greatest we had to put this together at the motel parking lot! lol

I believe the year was 96 when Frye came from the back to win the hat shootout!

fwiw....we ran the same setup on a limited, on a sandy slick paperclip track, and won a bunch of races with it!

[MasterSbilt_Racer]

No billet, we copied what Frye had. The hardest part was finding a long 5/8 bolt to hook the clamp bracket to the 1 piece birdcage. Since this was the latest/greatest we had to put this together at the motel parking lot! lol

I believe the year was 96 when Frye came from the back to win the hat shootout!

fwiw....we ran the same setup on a limited, on a sandy slick paperclip track, and won a bunch of races with it!

You are leaving something out. As you describe, this would not move til you broke something.