we have a dewar here at work thats about the size of a gas grille tank. It was somewhere between $250 and $500 as I remember. It also doesn't really have a seal on top so you have to be careful not to tip it. It costs $12 to get it filled though

Well, I had 160 liters of LN2 delivered yesterday and we had some fun!









Having done the wintertime and the torch and wire brush method I can say without a doubt this is the this is THE WAY of removing undercoating ( by the way I have removed 34 lbs so far) The best part is it leaves behind the very good factory primer.

i drew up one A-Arm plate yesterday but then when I looked at your pictures I realized that I made it too big. i will edit it today and make the top plate and shock gussets as well.

Awsome! I assume you guys did some other experiments with the liquid nitrogen once you were finished with the undercoating removal? :lol:

I know I would have smashed some bouncy balls/tennis balls. Probably poured some on various items just to see what happens :lol:

Not to sound like a noob but what is involved with this job? I assume you pour the liquid N2 onto the underbody coating but after that do you scrape it? or take a hammer and shatter it? Or does it just crack off?

Ian

that thing looks great! maybe one of these days i'll do that to the EMS, for now it can just be all rusty and oily for a while :lol:

Paul

we get liquid nitrogen at work sometimes. The bouncy ball thing doesn't work for us. We have smashed grapes, orange peels, and other food. We put a rubber bushing in once and it exploded. We tried an identical bushing made from a new material and that one doesn't explode. I once froze a mixture of isopropyl alcohol and iodine, it ended up looking like fish roe.

iodine and alcohol....yep thats right up there on top of my list of things to freeze in liquid Nitrogen

Freezing things in liquid nitrogen isn't as fun as it sounds, most of the stuff is pretty un-eventful.
The package said "Do Not Freeze" so why not try it?

I also worked a bunch on rust repair this weekend. The more you pick the more you find. I should get some good SAAB karma for fixing up this hulk.














And lots more to go:

Wow, that looks so much easier...with the undercoating removed AND flipped upside down.

Ya reading through this thread I find myself thinking: "wow amazing how much easier things are when you have the right tools".

Ian

The current rally car probably had about 50 hours into undercoating removal and theres still some left on it. We removed about 90% of the undercoating on this car in 4 hours. Another 30 minutes and we would have had it all done but we ran out of the stuff :(
Well worth the $150 for the tank.

Thanks to Mike (RallyHO) and JVL for loaning out the "death ray" applicator and hose.

Wow. I wonder how you'd do it w/o the Death Ray.

The death ray is pretty simple. Its just a piece of steel tube with a squished end and a nice perforated insulating grip around it. It could be fabricated fairly easily. The fittings are standard 45 deg hydraulic fittings. I bought an extra piece of cyro hose which I ended up not really needing. The death ray has a 4 foot hose + 3 foot wand and with the cylinder on castors I was able to get into most places just fine.
You open the valve, spray the nitrogen liquid/gas mix that comes out the nozzle over a 16"x16" area (it takes about 30-45 seconds to really freeze it) You can hear a "crackle" and then you know its ready. Take a hammer and with a good wack and large sheets just fly off. It may have been partially nitrogen asphyxiation but we were giggling all night!

Damnit Luke. That came out a lot better than mine. I think the turning-turtle thing really helps. My rotiseri won't allow that.

Looks like you've got a fair amount of rust repair to do...as I did.

Looks good man.