[Tigers] 2-post versus 4-post Lifts

[Tom Witt]

There would be a difference between a car falling off a lift (or the lift vertically collapsing)..., and the lift falling (tilting) over with the car still firmly attached.  It would seem the floor structure for a two post lift needs to be seismically substantial as compared to a four post lift.  I don’t think the issue is the two post lift collapsing (vertically) as much as it is simply falling (tilting front-back) with the failure at the floor attachment.  Tripods have at least three legs for a reason.

As a lifetime suburbanite I struggle to comprehend the need for a lift.  Are there really that many places that are width/depth challenged and yet have substantial height to elevate the car – especially for stacked parking? If you are replacing exhaust systems, brakes, transmissions on a daily basis sure they make sense. Maybe it is just my perpetually bad back, but having to stand, look up and work with arms up seems like torture compared to putting a car on jackstands and lying on the floor to work. A sheet of foam core makes a nice, cushioning insulator.  

From: CoolVT--- via Tigers 
Sent: Friday, January 29, 2016 12:38 PM
To: lwright at impactoffice.com ; tigers at autox.team.net 
Subject: Re: [Tigers] 2-post versus 4-post Lifts

Figure a Tiger at 2500 lbs. on a 9000lb rated lift.  Should be pretty secure. The guy who installed mine said they are actually tested at twice the rated capacity. I think as long as the Tiger isn't shaken off the lift then it's a pretty good bet that the lift won't collapse. 
Mark L

In a message dated 1/29/2016 3:13:28 P.M. Eastern Standard Time, tigers at autox.team.net writes:
      I'm sure all the West-coasters have been through it all before and shrug it off, but I was a couple of miles from home when I experienced our one significant earthquake, eh, 5 years ago -- and the first thing I thought of was the Tiger sitting on the lift in the garage. Came home, opened the door, all was well. 4-post lift. MAYBE someone can convince me that a 2-post is as stable under such circumstances...

  Larry Wright
  Seabrook, MD
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