Anyone using a lever jack? (quick lift)

[obrut]

Thinking about making one of these for wheel changing - easier to take to the track than a trolley jack.

Jack | Type 550

Anyone using one with a 911?

[McLaren-TAG]

They're used in F1, but I've got to imagine that the heavier the car, the more difficult is it to lift so you'd need quite a longer lever. Oh and a well designed/implemented lift point.

[masraum]

I've always wanted one that would work on my miata, but I suspect it's too heavy for it to be practical.

The versions that I see in F1 usually seem to lift the entire end of the car.

[Walt Fricke]

Do the math:

Assume rear weight is 2,000 lbs. Assume you lift the rear of the engine (I do this all the time with my jack). Assume you weigh 200 lbs. You will need a lever with the long side at least 10 times as long as the short side. If the short side is one foot, you will need a 10 foot long side. If a foot isn't enough, what with suspension droop when unloaded, to get the tires up off the ground, you will need a lever which is longer on each end. Or another 200 lb buddy to help you.

2,000 lbs maybe is close to a new 911 Turbo or some similarly heavy car, but you get the point - these systems are practical only for light weight (say 1,000 lbs) cars. And benefit from professional teams which can hire big strong and heavy guys, and can cart these bulky objects around.

Very seldom, outside of pro racing, does anyone ever need a sub- one minute tire change. Pitting in a sprint means you can't win. And there is zero practical beneit unless you have a crew. And with a crew, you can do just about as well with jacks. In fact, look how the pro Porsche teams do it: air jacks. And, of course, a crew.

[Emo993]

I have a vintage one that works very well, from 2" to 8" or with 2x6 on to 12" or14" lift,
also a Lotus vintage fuel tank. $150 each plus shipping.
Thanks, mark
mlindner@merr.com

[Emo993]

missed images of fuel tank.

[911-32]

Ryan - the Lighting Direct Race Team used one like that posted by Emo993 on the front of 964 Cup Cars back in the 90s. I can't recall exactly what they did on the back.

[agrimmitt]

Ryan:
No one likes lugging a jack, even the new lightweight alum one's. Along with everything else you need to bring these days. But I have to think the cars weight (and balance point) is the issue and in part overall safety. A couple comments talked about crew, in many (mine) cases crew is your fellow racing buddies; or the guy next to you! When used in a factory racing mode with a crew member controlling it>fine. But if it ever drops, first your wheel, brakes, fender (and rest of your day>should it drop on you) are all at risk; second if that bar "pops" up and another is within it's range of motion he or she will or could be hurt very badly. We all have seen then and think it looks easy and very cool. But at the risk of hurting someone, I would pass!
art
agrimmitt@pelican

[Pete R]

I don't see how hauling something like that blue one around would be much different than a jack.

[obrut]

Pete (and others)

That seems to be the result. To be effective on a 1000kg 911, you would end up with a device that is about as manageable as a jack...

[Walt Fricke]

If hauling a jack around is a pain, install the air jacks the Cup cars have. Then all you need to haul around is your nitrogen bottle, unless you do this right next to your trailer where the bottle permanently resides.