Exhaust jack...

[chevyfumes]

Ive seen These before but just wondering if anyone has ever used them..?
Looks like it'd be great for sand or mud instead of digging yourself in more.

https://m.youtube.com/watch?v=aILTlKPu3Zs

I'm bored.

 

[tRustyK5]

Good idea...must have a one way check valve on the bag.

 

[Phil513]

Two tons of back pressure on a motor strikes me as iffy, but hey, what do I know. lol. I agree, that looks great for sandy stuff.

 

[Big Ray]

I remember similar products back in the late 70's and 80's. I've seen large ones used to upright tractor trailers also. cool thinking.

 

[beags86]

Guys in the expo world have been using them successfully for years. One way check valve.

 

[diesel4me]

First time I saw one of those was back in the 70's,the local fire department used one to lift a overturned box truck ,so they could rescue the driver,and allow a fork loader to get under the box and flip it back onto its wheels..
The one they used was about 4 feet in diameter and inflated to about 6 feet high..
I bet it'd make an explosion louder than most 4th of july fireworks if one that big was punctured at full inflation by a bolt or other sharp object!....
I dont think I'd trust one enough to get under a vehicle held up by one for that reason..

 

[Phil513]

The recovery ones use air compressors, not exhaust.

I dunno, part of me still worries about that.

 

[Fordum]

Don't forget the amount of force developed is multiplied by the surface area.
1 pound per square inch over a thousand square inches is one thousand pounds......

A bag 4 feet by 4 feet is 2,304 square inches. Would not take much back pressure to lift a vehicle.

 

[diesel4me]

The one I watched the firemen use that day was exhaust powered,I remember watching them jam the hose over the tail pipe,and rev up the engine to inflate the bag..
I had visions of the hose blowing off when the bag was 90% inflated ..but I guess a check valve would prevent it from rapidly deflating--or go zipping off like a party balloon that slipped out of your hands when you went to tie the knot in it..zzzzsshhhhhhhipp!..

 

[Phil513]

Don't forget the amount of force developed is multiplied by the surface area.
1 pound per square inch over a thousand square inches is one thousand pounds......

A bag 4 feet by 4 feet is 2,304 square inches. Would not take much back pressure to lift a vehicle.

Excellent point, thank you!