duck walking

ss4367 · 03-11-2009, 05:14 PM

ive got a modified camaro with the m/t radials on it. when i let off after a pass it duck walks really bad. ive have tried draging down the motor nothing works. is this a commom prob. with the m/t or do i have a chassis prob?

Jeff Jewell · 03-11-2009, 08:20 PM

Hello...

Fought the same problem with Hoosier radials on my Corvette. Turned out that the corner weights were way off (too heavy on the front left corner). When I lifted on top end, the weight would shift from the right rear back to the left front and get the car swaying badly. I had the car scaled and made some changes. With the corner weights corrected, the car is straight as an arrow.

Tom Goldman scaled the car and did the work to correct the problem for me. Maybe he will chime in here with some other ideas.

Jeff Jewell

Tom Goldman · 03-11-2009, 09:24 PM

I think most chassis guys will agree there is not just one cause to this problem. ....I always start by checking the straightness and tracking of the chassis before scaleing the corner weights.......A lot of door cars are naturally heavy on the left front, sometimes adding preload to the right rear to correct the rear weights aggrivates the condition making the left front even heavier. ...This usually wont present a problem on acceleration, but it can upset the car during deceleration,especially if the bump is fairly soft on the front shocks....Spring rates can have an effect too. .....Jeff's car had a crooked rear shock mount ,which really threw the weight to the left front. ....I'd recomend checking the basics first. ...Jeff's car was professionally built by a respected shop,and it still had a problem. It can happen to anyone. ......Everybody will have a suggestion or a cure,and chances are many of them might help reduce of even cure the problem.......Tom

casper · 03-12-2009, 10:30 AM

Check out this thread ... it might help http://classracer.com/classforum/showthread.php?t=10764

03-11-2009, 05:14 PM	#1
ss4367 Junior Member Join Date: Jan 2008 Posts: 24 Likes: 0 Liked 0 Times in 0 Posts	duck walking ive got a modified camaro with the m/t radials on it. when i let off after a pass it duck walks really bad. ive have tried draging down the motor nothing works. is this a commom prob. with the m/t or do i have a chassis prob?

03-11-2009, 08:20 PM	#2
Jeff Jewell Member Join Date: Jun 2002 Location: Bangor, PA Posts: 182 Likes: 41 Liked 171 Times in 36 Posts	Re: duck walking Hello... Fought the same problem with Hoosier radials on my Corvette. Turned out that the corner weights were way off (too heavy on the front left corner). When I lifted on top end, the weight would shift from the right rear back to the left front and get the car swaying badly. I had the car scaled and made some changes. With the corner weights corrected, the car is straight as an arrow. Tom Goldman scaled the car and did the work to correct the problem for me. Maybe he will chime in here with some other ideas. Jeff Jewell

03-11-2009, 09:24 PM	#3
Tom Goldman VIP Member Join Date: Jan 2003 Location: Allentown,PA Posts: 2,477 Likes: 892 Liked 883 Times in 237 Posts	Re: duck walking I think most chassis guys will agree there is not just one cause to this problem. ....I always start by checking the straightness and tracking of the chassis before scaleing the corner weights.......A lot of door cars are naturally heavy on the left front, sometimes adding preload to the right rear to correct the rear weights aggrivates the condition making the left front even heavier. ...This usually wont present a problem on acceleration, but it can upset the car during deceleration,especially if the bump is fairly soft on the front shocks....Spring rates can have an effect too. .....Jeff's car had a crooked rear shock mount ,which really threw the weight to the left front. ....I'd recomend checking the basics first. ...Jeff's car was professionally built by a respected shop,and it still had a problem. It can happen to anyone. ......Everybody will have a suggestion or a cure,and chances are many of them might help reduce of even cure the problem.......Tom __________________ Tom Goldman 1500 SG , 1506 STK

03-12-2009, 10:30 AM	#4
casper Member Join Date: Nov 2002 Location: Canada Posts: 112 Likes: 4 Liked 1 Time in 1 Post	Re: duck walking Check out this thread ... it might help http://classracer.com/classforum/showthread.php?t=10764