Yes, this is an old demolition derby trick. You can fill the void behind that panel with high density foam. You can drill and tap this stuff, it is hard as a rock.
I am considering putting a filler panel behind it with about 2-3" void. I can fill that channel, and it will retain it's shape. Maybe it will buckle somewhere else, maybe it will stiffen my floppy doghouse. I can see it jiggle when I hit speed bumps.
Are you talking about using 2-part marine polyurethane?
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Do they have strength specs for this stuff? Thread pullout etc?
If you reinforce from the engine bay side but anchor to the foam it may help more stiffen things up even more. Maybe make some type of threaded insert out of steel with a ribbed (for the FJ's pleasure =P) or rough OD and just stick it in the foam before it dries.That foam would have to be pretty sturdy though. (Larry and Steve are going to kill me for my fix-it ideas again..)
..Also if you fill up all the other body panels of the FJ it just might float!
How about 750 PSI flexural strength. Basically the inner panel would be stiff as a board.
Quote:
dark matter previously said:
Are you talking about using 2-part marine polyurethane?
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Re: Engine Bay Body Rips
they use that expanding urethane foam in the frame rails and in between body panels of race cars to stiffen them up big time with barely any additional weight
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I think that foam might be the answer. As long as it doesnt expand too much or too fast because it might bulge the area in question as the metal used is paper thin. But hey at least its a thought and its got merit.
I would use stringers in the foam if you decide to go this way. Also, strength depends on the density. The only way to keep this as dense as possible, which I bet the rating 750 came from, is to have it compression molded which involves tooling, hydraulic presses etc.. not financially feasible. You will need to create a sealed cavity for the foam while expansion is taking place. This will give you the most strength as possible. another issue that will arise, can the FJ material hold during expansion
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Bush has delivered permanent war, a shredded Constitution, a back-breaking $9 trillion national debt, a flood of illegal cheap labor, outsourcing of middle class jobs and health care that is now unaffordable, all slathered with sticky Jesus syrup.
We're told the way to fix this is to pander to people who believe scientific facts are liberal lies, who treat blacks and gays with contempt and who plan on flying into the sky like Peter Pan when the Rapture comes.
Last edited by dark matter : 11-02-2007 at 06:36 AM.
I would use stringers in the foam if you decide to go this way. Also, strength depends on the density. The only way to keep this as dense as possible, which I bet the rating 750 came from, is to have it compression molded which involves tooling, hydraulic presses etc.. not financially feasible. You will need to create a sealed cavity for the foam while expansion is taking place. This will give you the most strength as possible. another issue that will arise, can the FJ material hold during expansion
The rate of expansion varies with the type of foam used. The really hard stuff expands very minimally compared to the home depot variety.
Getting the right amount for the space used is critical.
The rate of expansion varies with the type of foam used. The really hard stuff expands very minimally compared to the home depot variety.
Getting the right amount for the space used is critical.
I've worked with polyurethane foam for years in manufacturing. How are you determing the amount to use?
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Bush has delivered permanent war, a shredded Constitution, a back-breaking $9 trillion national debt, a flood of illegal cheap labor, outsourcing of middle class jobs and health care that is now unaffordable, all slathered with sticky Jesus syrup.
We're told the way to fix this is to pander to people who believe scientific facts are liberal lies, who treat blacks and gays with contempt and who plan on flying into the sky like Peter Pan when the Rapture comes.
I've worked with polyurethane foam for years in manufacturing. How are you determing the amount to use?
Good question. I figure I will need a few cubic feet for each side, so that woud give me a ordering criteria. As far as actually getting the space measured once it is framed in could be tricky. Maybe just a series of measurements. I plan to have the fender wells off, and maybe some other unnecessary crap like the fenders when I do it. I just need to explore the idea more. I also want to test it out on some junkyard stuff or derby cars. I have plenty of friends who would jump at the chance for a free derby car reinforcing job.
Good question. I figure I will need a few cubic feet for each side, so that woud give me a ordering criteria. As far as actually getting the space measured once it is framed in could be tricky. Maybe just a series of measurements. I plan to have the fender wells off, and maybe some other unnecessary crap like the fenders when I do it. I just need to explore the idea more. I also want to test it out on some junkyard stuff or derby cars. I have plenty of friends who would jump at the chance for a free derby car reinforcing job.
I am open to ideas.
Fill it with butter (or margarine), then turn the engine on...when it melts, collect the drippings and measure the volume.
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