Does my '73 have a weak frame?
Team Owner
Joined: Mar 2002
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but if flex in that direction is dramatic, it would be a good idea to check the condition of the frame. If we can't agree on that, I am willing to agree to disagree.
Last edited by wcsinx; Dec 10, 2010 at 11:17 AM.
Race Director
Joined: Apr 2000
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From: Who says "Nothing is impossible" ? I've been doing nothing for years.
If I have mine on jack-stands for more than a few minutes I put another jack under the front cross-member under the motor. I don't put much pressure on it but there is allot of weight just hanging there in front of the two forward jack-stands because of the motor, wheels etc 
Melting Slicks
Joined: Apr 2006
Posts: 2,084
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From: Airdrie Alberta
If I have mine on jack-stands for more than a few minutes I put another jack under the front cross-member under the motor.
I use 6 stands if the car is up for any length of time...I place my front stands under the front sway bar mount to frame. when placing them I jack the front up just enough to relieve the "Tension", my doors open and close when I do this.
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Melting Slicks
Joined: Mar 2008
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From: Meriden CT
It's going to depend on exactly where you jack as well as the weight distribution of the vehicle, but with most cars the wheel on the same side front or back will also lift. My experience is the same as Motorhead's...
I used to have an Integra that would lift 3 wheels in the air with 1 jack.
Metal only cracks if it's loaded past its yield point. And guess what, keep taking material out of the frame via rust, and what is left will eventually crack. Of course all frames will have some degree of flex, but if it's enough to see with the unaided eye or enough to bind up and/or damage things attached to it (e.g. doors) then that is too much. And the fact that there are some cars which do this and some which don't sends a very clear and obvious message to me.
I used to have an Integra that would lift 3 wheels in the air with 1 jack.
Metal only cracks if it's loaded past its yield point. And guess what, keep taking material out of the frame via rust, and what is left will eventually crack. Of course all frames will have some degree of flex, but if it's enough to see with the unaided eye or enough to bind up and/or damage things attached to it (e.g. doors) then that is too much. And the fact that there are some cars which do this and some which don't sends a very clear and obvious message to me.
