Shell Preppin '74 EMS

A place for long term threads surrounding a specific project or SAAB build for motorsports or restoration
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Geoff
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Postby Geoff » Thu May 31, 2007 11:12 am

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 :D

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Luke
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Postby Luke » Sun Jun 24, 2007 1:06 am

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

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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.
Last edited by Luke on Wed Apr 02, 2008 9:06 am, edited 1 time in total.

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Crazyswede
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Postby Crazyswede » Sun Jun 24, 2007 8:47 am

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.
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saab90089
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Postby saab90089 » Sun Jun 24, 2007 10:22 pm

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
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Postby paulh » Mon Jun 25, 2007 12:10 am

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

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Geoff
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Postby Geoff » Mon Jun 25, 2007 7:42 am

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.

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Crazyswede
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Postby Crazyswede » Mon Jun 25, 2007 9:34 am

iodine and alcohol....yep thats right up there on top of my list of things to freeze in liquid Nitrogen :roll: :?:
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Geoff
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Postby Geoff » Mon Jun 25, 2007 9:52 am

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? :)

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Luke
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Postby Luke » Mon Jun 25, 2007 10:39 am

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.

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And lots more to go:

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Last edited by Luke on Wed Apr 02, 2008 9:18 am, edited 1 time in total.

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Postby GRMPer » Mon Jun 25, 2007 11:03 am

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

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Postby saab90089 » Mon Jun 25, 2007 12:12 pm

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

Ian
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1-C900 turbo w/290K--mine

4-C900 turbo's in various states--dads

1-Legacy wagon--dads

1-Forester--moms

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Luke
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Postby Luke » Mon Jun 25, 2007 12:54 pm

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.
Last edited by Luke on Mon Jun 25, 2007 1:51 pm, edited 1 time in total.

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Postby GRMPer » Mon Jun 25, 2007 1:01 pm

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

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Luke
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Postby Luke » Mon Jun 25, 2007 1:24 pm

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!

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Postby Rallyho » Mon Jun 25, 2007 2:27 pm

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.
Rallyho


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