Dry Ice (Sorry, John.)
Posted by DR1665
Brian Driggs Super Moderator Location: Glendale Join Date: 06/08/2006 Age: Midlife Crisis Posts: 832 Rally Car: Keyboard. Deal with it. |
The beast is almost ready for its cage!
This car will be lucky if it's got a logbook by summer, and luckier if it sees rally competition by 2012. I want to use the LN deathray, but I don't see the point in spending the time to strip the car down to the bare unibody and re-building it from scratch. Fuck it. This is a maybe one rally a year plaything that's gonna see autox, rallyx, and (yawn) drag racing action. I'll probably try to surprise more than a few Jeep owners out on the trails with it as well. I'm doing this for fun. No points. No trophies. No X-Shames invites. So, there's maybe 4 square foot of floor pan where I need to remove the ooey-gooey to make my welder happy. I'm going with dry ice. A quick search brings up a thread about some cat in SoCal what had his roof dissolved for $1800 in a giant tank of Lye. Looking for some insight on how much dry ice I should get, how to use it, and how to get the most out of it. What do I need to know to do it right the first time? Thanks, and sorry John.  Brian Driggs | KG7KCA | PHX, AZ | 89 Pajero alterius non sit qui suus esse potest |
John Vanlandingham Junior Moderator Location: Ford Asylum, Sleezattle, WA Join Date: 12/20/2005 Age: Fossilized Posts: 14,152 Rally Car: Saab 96 V4 |
Geeeze just lift the loom and wires out of the way... Dry ice is a waste of time and how is it supposed to contact directly the undercoating? A gap of 2mm and you have a nice cushion of insulating air and it won't work like liquid which flows and conforms... Go read some Taoist poetry about water....nothing is more compliant, it accepts anything yet it can break rocks... |
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John Vanlandingham Junior Moderator Location: Ford Asylum, Sleezattle, WA Join Date: 12/20/2005 Age: Fossilized Posts: 14,152 Rally Car: Saab 96 V4 |
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John Vanlandingham Junior Moderator Location: Ford Asylum, Sleezattle, WA Join Date: 12/20/2005 Age: Fossilized Posts: 14,152 Rally Car: Saab 96 V4 |
That red in the face thing, well for me it was all the tiny droplets of Liquid N splashing back, cause where the safety gargles were the red stopped... The other pain in the ass thing is how selective gravidity is (look up my fawkin jokes boys that ain't miss-spelt) is. Shredded dry ice only works when the panel in question has cooperated and slid itself UNDER said dry ice because for reason I haven't yet--YET!!! fingered out,(only 2 cuppsa tea this morning so far!) the dry ice seems to fall off of panels that are vertical---meaning a fawkin near unfingeroutable logistical nightmare to have to always position the car under the ice... With the amazingly simple, brilliant and EASY Sooooper Bitchin Death Ray Gun, the car can be flat on the ground, tilted 45 degrees, tilted 90 degrees, or VIOLA, manure! Tilted 180 degrees or even YES! 360 degrees and the Liquid works the same. Of course some cars have such sparse undercoating that the Sooooper Bitchin-est methods are overkill, but some cars, these fawkin Xartties I like have every square mm of the ENTIRE underside and wheelarches SLATHERED DEEP in the hot-sprayed rubberized stuff. It is the only sensible method then. The dry ice method, while wasteful and ineffcient will probably work in a Misterbitcy with a few dabs of cheap gooo daubed here and there. (harumph! )
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Brian Driggs Super Moderator Location: Glendale Join Date: 06/08/2006 Age: Midlife Crisis Posts: 832 Rally Car: Keyboard. Deal with it. |
John, if I was going to be removing all kinds of material, then I'd absolutely be seeking out the LN Deathray. As it were, I've got just 4 locations inside the car, totaling less than 4sq-ft, so it's not a huge job. See below picture (still need to shopvac the floor, excuse my mess). One of just 4 locations I need to clean up for welding, likely 10" by 8". (Basically, the area to the right of the rectangular recess at the base of the B-pillar, and on the door-side of the darker, rectangular bit (with the hole at center) where the rear seat mounted.)
Here's how I see my options... LN Deathray Track down the gun, arrange shipment to my place, find local Airgas supplier, schmooze on the phone, drive across town to schmooze face-to-face, leave credit card deposit, schedule dewar delivery, push car out of garage, suit up, assemble contraption, apply LN, remove goo, tear down setup, push car back into garage, schedule dewar pickup, find someplace to store the deathray until called upon. Dry Ice Throw dry ice in cooler, take it home, open the garage door, use a hammer to break up the ice, place foggy stuff in 4 spots, have a smoke, use hammer to break up insulation, maybe move some foggy stuff around a bit, use the hammer some more, close the garage door, remember to leave the garage door open a bit and leave a fan running to air the place out when done, crack a beer, light another smoke, call fabricator to schedule pick up of Misterbitchy for roll cage install. I suspect I could remove this shit with a razor blade and a wire wheel on my drill (despite it still pushing 100* here during the day), but why work harder? Believe me. I've been reading about the LN Deathray for years. I want to use it. I can see the pictures of Grant suited up to spray down a shell on the rotisserie in my mind as I type this, but I'm not doing that level of prep. The sooner I complete this car, the sooner I can stuff it, swap the bits over to the other Galant, and start shopping for a round-headlight 240 or second generation Alfa Spider. If it's worth doing, it's worth doing right, but right in this case means getting the car to the goddamned fabricator for a cage, not getting the car prepped to challenge Bill Bacon in a national series. Fast, right, cheap. In this situation, I'm all of the above. Brian Driggs | KG7KCA | PHX, AZ | 89 Pajero alterius non sit qui suus esse potest |
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The dry ice worked great. In fact, I even removed more a little extra up front because it was coming off so easily.
Of course, the dry ice probably wouldn't work upside-down, on the undercarriage.  Brian Driggs | KG7KCA | PHX, AZ | 89 Pajero alterius non sit qui suus esse potest |
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Brian Driggs Super Moderator Location: Glendale Join Date: 06/08/2006 Age: Midlife Crisis Posts: 832 Rally Car: Keyboard. Deal with it. |
Just a couple quick shots to show some of the areas in question...
Original, 4lb block 
Split into 4 with a chisel and mallet 
Final result, ready for wire wheel 
Driver's footwell, ended up removing material nearly all the way to the driveshaft tunnel on both front locations, before I got bored and wanted a nap. 
Total cost: $26.00 (I bought a $20 cooler to carry it) Again, I'd love to use the LNDR, but for such a small area, it seemed a bit much. Like using an acetylene torch to light a smoke or something. Brian Driggs | KG7KCA | PHX, AZ | 89 Pajero alterius non sit qui suus esse potest |
John Vanlandingham Junior Moderator Location: Ford Asylum, Sleezattle, WA Join Date: 12/20/2005 Age: Fossilized Posts: 14,152 Rally Car: Saab 96 V4 |
Whaddya mean, here's what I use when I can't find my Bic: 
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